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WattsOn-Mark II Manual - Elkor Technologies Inc.

1. a SER RN CRY VENYN dduadivensavedteddussduadisceadeddsnais 11 4 1 Modbus Protocol nv a Bal lal j H O HELA a V STA K Sa aa ua R R R a aa 11 4 25 Modbus FUNCIONS a a a 11 AN AT ON 13 5 1 Register Addressing Conventions siii e dead aida aan 13 9 27 Re ister iz iii A sages a A HR 13 5 3 Data PES A ia 13 5 4 Instantaneous Data Registers vassa dori a al canaria 14 5 5 Accumulated Data Registers ics Baa a saal a a ka rasa a saga aR 15 5 6 Configuration and Status REgISterS sirisser 21 AS SS A TO 28 5 8 Relay Output Configuration Registers a222aaaaa ava avasasasasasanananunununununununnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnananan aaa 31 6 Customizing the Register 33 7 Firmware Updates and the Bootloader aaan2xnaaxnnnaannnnnunnnunnnnnunnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnannnnn anna 35 8 Appendix A Wiring Ra Ru ENAA RES a RR Sa uu gna aa yn REENA 36 8 1 Four Wire Wye Wiring Diagram aaaaanaaaaxaassasanannnnnnnnnnnnnnnnnnnnnnnannnnnnnnnnnannnnnnnnnnnannnnnnnnNNNANNNNNKNNINNANKa nn Kana nnne nnns 36 8 2 Three Wire Delta Wiring Diagram Three CTS cece nn een nnn nnne nnn nnn nnn nnn nnn nnn 37 8 3 Three Wire Delta Wiring Diagram Two CTS aaaaaxnxaxnaaaaa nnnnnnnnsnsnnnnnnnnnnn
2. values are read as 0 See p Secondary PT Ratio B 0 500 41294 16 U RW 1 23 Primary PT Ratio C OxSOE 41295 16 U RW 1 Secondary PT Ratio C OxSOF 41296 16 U RW 1 6 These registers always output their default values They useful for 200 m R ERE debuoding ih ith the device Debug Floating Point 0x513 41300 32 F R 1234 567 Uptime 0x515 41302 32 U RW Seconds since the device was last powered on or reset See p 23 Masking Enabled 0x517 41304 16 B RW False Indicates whether Modbus Masking is enabled See p 23 Masking Override 0x518 41305 16 B RW False Indicates whether masks can override existing registers See p 23 Noise Filtering Enabled 0x519 41306 16 B RW True Indicates whether low current noise filtering is enabled See p 23 32 bit Little Endian Mode Ox51A 41307 16 B RW False If enabled 32 bit registers are sent least significant word first See p 23 Current LED Threshold 0x51B 41308 16 S RW 1 0 1 Expressed in 10ths of a percent of the full scale varies by model See p 24 Voltage LED Threshold 0x51C 41309 16 S RW 5 5 Expressed as a percentage of 400 See p 24 Serial Number 0x51D 41310 32 U RW Factory programmed serial number of the unit Hardware Version OxSIF 41312 16 Version numbers of different hardware and software components of this Firmware Version 0x520 41313 16 U R device Divide by 100 to get the version number for example a value of Bootloader Ver
3. always 0 Address Code Code 1 63 8 11 0 1 byte 1 byte 1 bytes 2 bytes 2 bytes Response Modbus Function Sub function Data Address Code Code 1 63 8 11 Counter value 1 byte 1 byte 1 bytes 2 bytes 2 bytes ELKOR TECHNOLOGIES INC Page 44 WattsOn Mark II USER MANUAL 9 9 4 Return Slave Message Count This function returns a count of all Modbus messages addressed to this device that it has received since power up Request Modbus Function Sub function Data always 0 Address Code Code 1 63 8 14 0 1 byte 1 byte 1 bytes 2 bytes 2 bytes Response Modbus Function Sub function Data Address Code Code 1 63 8 14 Counter value 1 byte 1 byte 1 bytes 2 bytes 2 bytes 9 9 5 Return Communication Error Count This function returns a count of all Modbus messages that failed the CRC check upon reception Request Modbus Function Sub function Data always 0 Address Code Code 1 63 8 12 0 1 byte 1 byte 1 bytes 2 bytes 2 bytes Response Modbus Function Sub function Data Address Code Code 1 63 8 12 Counter value 1 byte 1 byte 1 bytes 2 bytes 2 bytes 9 9 6 Return Exception Count This function returns a count of all Modbus messages that this device responded with an exception response Modbus Function Sub function Data always 0 Address Code Code 1 63 8 13 0 1 byte 1 byte 1 bytes 2 bytes 2 bytes Response Modbus
4. or 0x1800 for the second third and fourth blocks respectively Next write the number of registers that the block will contain to the Size register 0x1501 or 0x1601 0x1701 or 0x1801 for the second third and fourth blocks respectively Finally write the Modbus address of each register that will be included in the block at addresses from 0x1502 to 0x157F or from 0x1602 0x1702 or 0x1802 for the second third and fourth blocks respectively Note To include 32 bit registers the two consecutive offsets will need to be written for the higher and lower order register Example To place the Net Total Energy and Firmware Version registers in a custom block starting at offset 0x400 enter 0x400 into start address register 0x1500 7ota Energy Consumption is 32 bits long so it occupies 2 registers while Firmware Version is 16 bit occupying 1 register for a total of 3 registers occupied in total Enter 3 into block size register 0x1501 Enter the values 0x1100 0x1101 and 0x520 into the registers 0x1502 to 0x1504 Because Net Total Energy is 32 bit both 0x1100 and 0x1101 must be entered Setting the Size register to O will remove a custom Modbus block In the event that a custom Modbus block is in the same location as the Masking Enabled or Masking Override registers custom Modbus blocks can be removed by writing a 0 to each of the size registers 0x1501 0x1601 0x1701 and 0x1801 Custom Register Map Block
5. 1 Description Custom Block 1 Address 0x1500 45377 16 U RW 0 Modbus offset at which the 1 custom Modbus block will be placed Custom Block 1 Size 0x1501 45378 16 U RW 0 Number of registers in the 1 custom Modbus block Custom Block 1 Register 1 0x1502 45379 16 U RW 0 U RW 0 List of register offsets of the registers that will be included in the 1 Custom Block 1 Register 2 0x1503 45380 16 custom Modbus block Register addresses beyond the count specified in the Size register will be ignored Custom Block 1 Register 126 0x157F 45504 16 U RW 0 ELKOR TECHNOLOGIES INC Page 33 WattsOn Mark II USER MANUAL Custom Register Map Block 2 Description Custom Block 2 Address 0x1600 45633 16 U RW 0 Modbus offset at which the 2 custom Modbus block will be placed Custom Block 2 Size 0x1601 45634 16 U RW 0 Number of registers in the 2 custom Modbus block Custom Block 2 Register 1 0x1602 45635 16 U RW 0 Custom Block 2 Register 2 0x1603 45636 16 U RW 0 List of register offsets of the registers that will be included in the 2 custom Modbus block Register addresses beyond the count specified in the Size register will be ignored Custom Block 2 Register 126 0x167F 45760 16 U RW 0 Custom Register Map Block 3 Description Custom Block 3 Address 0x1700 45889 16 U RW 0 Modbus offset at which the 3 custom Modbus block will be placed Custom Block 3 Siz
6. Apparent Energy Resettable B 0x113A 44411 32 F R kVAh Import Apparent Energy Resettable C 0x113C 44413 32 F R kVAh Export Apparent Energy Resettable A 0x113E 44415 32 F R kVAh Export Apparent Energy Resettable B 0x1140 44417 32 F R kVAh Export Apparent Energy Resettable C 0x1142 44419 32 F R kVAh Q1 Reactive Energy Resettable A 0x1144 44421 32 ls R kVARh Q1 Reactive Energy Resettable B 0x1146 44423 32 F R kVARh Q1 Reactive Energy Resettable C 0x1148 44425 32 F R kVARh Q2 Reactive Energy Resettable A 0x114A 44427 32 F R kVARh Q2 Reactive Energy Resettable B 0x114C 44429 32 F R kVARh Q2 Reactive Energy Resettable C 0x114E 44431 32 F R kVARh Q3 Reactive Energy Resettable A 0x1150 44433 32 F R kVARh Q3 Reactive Energy Resettable B 0x1152 44435 32 F R kVARh Q3 Reactive Energy Resettable C 0x1154 44437 32 Is R kVARh Q4 Reactive Energy Resettable A 0x1156 44439 32 F R kVARh Q4 Reactive Energy Resettable B 0x1158 44441 32 F R kVARh Q4 Reactive Energy Resettable C 0x115A 44443 32 F R kVARh ELKOR TECHNOLOGIES INC Page 18 WattsOn Mark II USER MANUAL 5 5 3 Revenue Non Resettable Integer Accumulated Data Registers These registers do not reflect resets made using the Energy Reset register Name Offset Address Size Type R W Units Net Total Energy Revenue 0x1200 44609 32 S R Wh
7. Function Sub function Data Address Code Code 1 63 8 13 Counter value 1 byte 1 byte 1 bytes 2 bytes 2 bytes ELKOR TECHNOLOGIES INC Page 45 WattsOn Mark II USER MANUAL 9 10 Get Comm Event Counter This function returns a count of all Modbus messages that were successfully completed without error or exception The structure of its frames is as follows Request Modbus Function Address Code 1 63 11 1 byte 1 byte 2 bytes Response Modbus Function Status always 0 Event Count Address Code 1 63 8 0 Counter value 1 byte 1 byte 2 bytes 2 bytes 2 bytes 9 11 Report Slave ID This function returns an ID number a status code and a text string identifying the device The status code is 0x00 when the device is in bootloader mode and OxFF otherwise The text string is an ASCII text string containing the name of the product its input configuration mA mV or 5A and its hardware and software version The string is null terminated meaning a 0 is transmitted after the last character Example String Elkor Technologies W2 M1 mA Hardware 1 00 Firmware 1 00 While in bootloader mode the string returned contains the bootloader version for example Elkor Technologies Bootloader 1 00 The structure of its frames is as follows Request Modbus Function Address Code 1 63 17 1 byte 1 byte 2 bytes Response Modbus Function Byte Count Slave ID Status St
8. is configured as a 32 bit register Example Register 0x100 is a 32 bit register Suppose a read of register 0x100 returns 0x0003 and a read of register 0x101 returns 0x0D40 Concatenate these two registers together to get a hexadecimal value of 0x00030D40 or a decimal value of 200 000 By default the higher order 16 bit word of a 32 bit register is the register with the lower address and the lower order word is at the higher address Most Modbus software and devices will interpret 32 bit registers this way Alternatively the WattsOn can be configured to reverse the byte ordering so that the higher order word is at the higher address and the lower order word is at the lower address See 5 6 6 Setting 32 bit Endianness p 23 for details on how to configure this setting 5 3 Data Types Registers contain data in one of four different types Data types are given in the register tables with a single letter code in the Type column to indicate the type The types are as follows Type Code Description Unsigned U Positive whole numbers no sign Can range from 0 to 65 535 for 16 bit registers and 0 to 4 294 967 295 for 32 bit Integer registers Signed S Positive or negative whole numbers Represented in 2 s complement format Can range from 32 768 to 32 767 for 16 bit Integer registers and 2 147 483 648 to 2 147 483 647 for 32 bit registers Floating Point F Positive or negative decimal numbers Represented in IEEE 75
9. is measured using one of the three voltage channels By default the device will automatically select a voltage channel with an RMS voltage greater than 5V on which to perform the frequency measurement If the voltage in this channel falls to below 5V a new channel will be automatically selected If no channel contains a voltage above this threshold the frequency will read 0 The channel currently being used is displayed in the Frequency Active Channel register Ox533 0 1 and 2 represent channels A B and C respectively The meter may instead be forced to use a specific voltage channel for frequency measurement To do so first disable automatic channel selection by writing 0 into the Auto Frequency Channel register 0x532 Then write a value into the Frequency Active Channel register corresponding to the desired channel to be used for frequency measurement with 0 representing channel A the first channel from the left 1 representing channel B and 2 representing channel C 5 6 16 Scratch Pad Registers There are 32 scratch pad registers available starting at register 0x540 and ending at Ox55F Any values can be written to these registers Values written to these registers will be stored in non volatile memory so that they are retained after the device has been powered off or rebooted These can be used for room numbers customer IDs or any other purpose as desired These registers are not used for any measurement
10. left green The device will accept up to 347V L N or 600V L L without a transformer For higher voltages potential transformers are required Connect the two or three wire RS 485 line to the device s top right green terminal The ground wire may be optional for short distances The Modbus specification recommends the use of shielded RS 485 cabling Twisted pair is recommended for noisy environments Bus termination may be required for complex networks Connect the other end of the Modbus line to the Modbus master device PLC PC etc Relay outputs may be wired for example with pulse counters Configure the device s Modbus address by setting the hardware address switch The address of each device on the RS 485 line must be unique If only one device on the line it can be left at the default setting 1 Addresses from 1 to 15 can be set via the switch and if necessary higher addresses can be set over Modbus once communication is established see 3 7 Digital Communications 10 The address must not be set to 0 for normal anaratinn Connect a 12 35 VDC 24VAC power supply to the device s black power terminal Program the CT Ratio primary for 5A or millivolt CTs or turn count for milliamp CTs into register 0x500 using the Modbus master device See Setting CT Ratios p 21 for details If voltage transformers are being used program the transformer ratio into register 0x508 and 0x509 Read the Debug Register 0
11. may be necessary to enable a response delay within the WattsOn If such problems exist a delay may be introduced by using the Serial Response Delay register 0x604 The WattsOn will wait at least as long as specified by this register in milliseconds before responding Generally small values between 0 to 100 milliseconds are sufficient The default value is 0 meaning that the WattsOn will respond as soon as its data is ready to reply to the query Changes are not applied until a 1 is written to the Seria Commit register This is to ensure that all serial settings are applied at once in case that more than one serial parameter was changed Once the changes are applied the new settings must be confirmed by reading any register using the new settings as described in the section below 5 7 3 Confirming Serial Settings Change In order to guard against accidental changes to the device s serial settings and to protect against incorrect or unknown values there is a 3 minute period in which the Modbus master device must successfully communicate with the WattsOn before the new settings become permanent This is to ensure that the Modbus master software or device is capable of correctly communicating at the new settings Reading or writing any register or using any other Modbus function is sufficient for this purpose If a successful query is not received within the 3 minute waiting period or the WattsOn was rebooted before a successful com
12. purposes Note Consideration should be given to the fact that these registers are written to flash memory which has limited write cycle endurance Writes should be limited to fewer than 10 000 operations Writes in excess of 10 000 may cause the device to become permanently read only in order to protect itself from a flash failure ELKOR TECHNOLOGIES INC Page 27 WattsOn Mark II USER MANUAL 5 7 System Registers These registers are used to configure the serial communication parameters to reset the device or to enter the device s bootloader mode for firmware updates Description D iz 5 If the hardware address switch is in the position the value set here is Modbus Address 0x600 41537 16 U RW 15 used instead of the switch s address This allows addressing more than 15 Modbus devices on the same line Serial Baud Rate 0x601 41538 16 U RW 9600 Serial Parity Mode 0x602 41539 16 U RW 0 Sets the device s serial parameters These settings are not applied until a Serial Stop Bits 0x603 41540 16 U RW 1 1 is written to the Serial Commit register and are not permanent until a Serial Response Delay 0x604 41541 16 U RW 0 valid Modbus query message is received using the new settings Serial Commit 0x605 41542 16 U RW 0 Reserved 0x606 41543 16 R 0 Reserved for future use These registers output 0 when read To ensure Reserved 0x607 41544 16 R 0 compatibility with fut
13. registers in total Two blocks reflect resets they can be reset to 0 at any time The remaining two blocks do not reflect resets and retain their total accumulated value despite any number of resets issued by the user Revenue grade metering applications or applications that do not require the ability to reset the meter should always read the non resettable registers ELKOR TECHNOLOGIES INC Page 15 WattsOn Mark II USER MANUAL Resettable and non resettable registers each have a floating point block for modern systems and an integer block for systems that do not support floating point data It is recommended to read the floating point data if possible as there is then no need to multiply the results by any scaling factors in that case The WattsOn s internal accumulated energy will never overflow however when reading 32 bit integer representations of the energy registers in combination with large CT or PT ratios 32 bit integers may not be large enough to contain the information To address this problem the WattsOn has an Energy Integer Divider Register 0x52E which is applied to the energy values as they are read By default this is set to 100 This sets the resolution of the energy registers to 100 Wh VAh VARh by default The maximum resolution is 1 Wh VAh VARh including CT PT scaling with the divider set to 1 This divider can be adjusted if desired either to accommodate larger CT PT ratios or if greater resolution is desir
14. secondary CT ratios registers 0x503 0x505 and 0x507 is not generally necessary as they will default to correct values 5 for 5A CTs 333 for 333 mV CT and 1 for mA CTs Example Suppose 50A 5A CTs are connected to channels A and B and a 250A 5A CT is connected to channel C Write the value 50 to registers 0x502 and 0x504 and the value 250 to register 0x506 Leave registers 0x503 0x505 and 0x507 at their default values of 5 Note While it is possible to use CTs with different full scale ratings or turns ratios together on the same unit it is not possible to mix 5A CTs millivolt CTs or milliamp CTs together on the same unit ii Greater Accuracy To maximize accuracy many Elkor milliamp CTs are factory tested to quantify the precise effective turns ratio In this case the number of turns is indicated on the CT itself The values account for manufacturing variations resulting in greater accuracy For each channel enter the precise number of turns for the CT connected to the corresponding input channel Write the value for channels A B and C into registers 0x502 0x504 and 0x506 respectively Example Suppose there are three MSCT1 CTs connected to the device The CTs have the effective turn count indicated on each of them The CT connected to channel A lists 7492 the CT connected to channel B lists 7490 and the CT connected to channel C lists 7493 Write the value 7492 to register 0x502 the value 7490 to registe
15. to pulse on the relay output labelled K2 on the device 2 Write 0 into the Relay KI K2 Register Offset register 0 901 0 902 to indicate relative mode This causes the pulses to trigger when the register value changes rather than on a set value 3 To pulse on positive energy accumulation consumption enter a value into the Relay KI K2 Upper Bound register Ox902 0x90C By default with the Energy Integer Divider register set to 100 the energy accumulation registers increase by 1 for each 100 Wh VAh VARh of energy Therefore enter 1 to pulse on every 100 ELKOR TECHNOLOGIES INC Page 31 WattsOn Mark II USER MANUAL Wh VAh VARh of energy accumulated 10 for every 1 0 kWh kVAh kVARh etc To only pulse on negative energy accumulation generation write a 0 into this register To pulse on negative energy accumulation generation enter a value into the Re ay K1 K2 Lower Bound register 0x904 0x90E As above by default a value of 1 represents 0 1 Wh VAh VARh Write 0 to ignore negative energy accumulation Enter the desired duration of the pulse in milliseconds into the Relay K1 K2 Min Duration register 0 906 0 910 For example enter 100 for 100 millisecond pulses or 1000 for 1 second pulses To have the relay close when a pulse is generated normally open enter a 0 into the Relay K1 K2 Active Mode register 0x907 0x911 To have the relay open when a pulse is generated normally clo
16. 2 so 5 ems ceo re erret nere e Frac eher na ER ERE rne repe ns n r s baks 3 Table of ContentS ci cicosiconinonicinicnaninosiancani bandana adrad anaoa dainadaina RR VE REN SERERE GUN RR RA STERN n RR Aa 4 1 Introduction A a 5 1 1 Electrical eite ec lalalala TR Lowe t dou Coe Ie end Qvo 5 a vende E a Poole hole Wa ove otio to 5 1 3 REVISION SEE EET 5 14 Wala ly dee ca dues A a a 5 1 5 Product Descr pTO Nr 5 2 SPCCHICATIONS iiiinsiscderiicsascedacscdensisttavuchasscunsiuctdsccausdsunassecdsacaueadunasiueaaddcundduadsaclaanicaadusdedscaaeiaauaducdaausausaeaaais 6 eae BB n Tc ez 7 0 R gt EN EM Em 7 3 Installation errr fa ccuka 8 3 1 Grounding Considerations ici inca a Deu ge ha ERR RR DER ERR vate a FA DAR teen nied a LA ENTE TRA Ru VR a 8 3 2 Power Supply eee i A ace ea eee ne sae 8 NECE A ILLI DL 8 3 4 Fusing of Voltage Sensing Inputs e eere nantur nu 8 3 5 Enclosure MOUNtING EP edad aaa 8 3 6 Commissioning Flowchart asiad nus rrr dieere eraat err VAR R RAE CaA RR YER Sa ERR eadar Kafai RRARYIRERKRNELS 9 3 7 Digital Communications aa TEL RE TEL KNEE RD Alai ai TRE aaa 10 4 Communication iii vla la
17. 32 S R VAh Total Export Apparent Energy Resettable 0x100A 44107 32 S R VAh Q1 Total Reactive Energy Resettable 0x100C 44109 32 S R VARh Q2 Total Reactive Energy Resettable 0x100E 44111 32 S R VARh Q3 Total Reactive Energy Resettable 0x1010 44113 32 S R VARh Q4 Total Reactive Energy Resettable 0x1012 44115 32 S R VARh Q1 Q2 Total Inductive Reactive Energy Resettable 0x1014 44117 32 S R VARh Q3 Q4 Total Capacitive Reactive Energy Resettable 0x1016 44119 32 S R VARh Reserved 0x1018 44121 32 z R Reserved Ox101E 44127 32 R Net Energy Resettable A 0x1020 44129 32 S R Wh Net Energy Resettable B 0x1022 44131 32 S R Wh Net Energy Resettable C 0x1024 44133 32 S R Wh Net Apparent Energy Resettable A 0x1026 44135 32 S R VAh Net Apparent Energy Resettable B 0x1028 44137 32 S R VAh Net Apparent Energy Resettable C 0x102A 44139 32 S R VAh Import Energy Resettable A 0x102C 44141 32 S R Wh Import Energy Resettable B 0x102E 44143 32 S R Wh Import Energy Resettable C 0x1030 44145 32 S R Wh Export Energy Resettable A 0x1032 44147 32 S R Wh Export Energy Resettable B 0x1034 44149 32 S R Wh Export Energy Resettable C 0x1036 44151 32 S R Wh Import Apparent Energy Resettable A 0x1038 44153 32 S R VAh Import Apparent Energy Resettable B 0x103A 44155 32 S R VAh Import Apparent Energy Resettable C 0x103C 44157 32 S R VAh Export Apparent Energy Resettable A 0x103E 44159 32 S R VAh Export Apparent Energy Resettable B 0x1040
18. 4 format Can represent values from negative infinity to positive infinity at decreasing levels of resolution as the number because larger Boolean B True or false False is represented by the value 0 true is represented by the value 1 ELKOR TECHNOLOGIES INC Page 13 WattsOn Mark II USER MANUAL 5 4 Instantaneous Data Registers Instantaneous data registers contain the real time measurements from the input channels on the device including current voltage power power factor and frequency For energy registers see 5 5 Accumulated Data Registers p 15 The instantaneous registers are presented in two different formats each in a separate block of registers as floating point data for modern systems and as integer data for systems which do not support floating point data It is recommended to read the floating point data if possible as there is then no need to scale the registers manually Both integer and floating point registers incorporate the CT and PT ratios entered into the configuration registers described in section 5 6 Configuration and Status Registers p 21 5 4 1 Integer Instantaneous Data Registers The following registers are 32 bit integer representations of the measured parameters To allow integer registers to represent decimal numbers the integer registers are scaled according to a scaling factor Divide the value read from these registers by the scaling factor in the Sca e column to get a deci
19. 44161 32 S R VAh Export Apparent Energy Resettable C 0x1042 44163 32 S R VAh Q1 Reactive Energy Resettable A 0x1044 44165 32 S R VARh Q1 Reactive Energy Resettable B 0x1046 44167 32 S R VARh Q1 Reactive Energy Resettable C 0x1048 44169 32 S R VARh Q2 Reactive Energy Resettable A 0x104A 44171 32 S R VARh Q2 Reactive Energy Resettable B 0x104C 44173 32 S R VARh Q2 Reactive Energy Resettable C 0x104E 44175 32 S R VARh Q3 Reactive Energy Resettable A 0x1050 44177 32 S R VARh Q3 Reactive Energy Resettable B 0x1052 44179 32 S R VARh Q3 Reactive Energy Resettable C 0x1054 44181 32 S R VARh Q4 Reactive Energy Resettable A 0x1056 44183 32 S R VARh Q4 Reactive Energy Resettable B 0x1058 44185 32 S R VARh Q4 Reactive Energy Resettable C 0x105A 44187 32 S R VARh ELKOR TECHNOLOGIES INC Page 17 WattsOn Mark II USER MANUAL 5 5 2 Resettable Floating Point Accumulated Data Registers The following registers are 32 bit floating point representations of the accumulated energy parameters expressed in IEEE 754 format These registers reflect resets made using the Energy Reset register 0x524 see 5 6 8 Resetting Accumulated Energy p 24 for details Name Offset Address Size Type R W Units Net Total Energy Resettable 0x1100 44353 32 F R kWh Total Net Apparent Energy Re
20. 529 32 F R System Quadrant 0x212 40531 32 F R Reserved 0x214 40533 32 R Reserved 0 21 40543 32 R Voltage A 0x220 40545 32 F R V Voltage B 0x222 40547 32 F R V Voltage C 0x224 40549 32 F R V Voltage AB 0x226 40551 32 F R V Voltage BC 0x228 40553 32 F R V Voltage AC 0x22A 40555 32 F R V Current A 0x22C 40557 32 F R A Current B 0x22E 40559 32 F R A Current C 0x230 40561 32 F R A Active Power A 0x232 40563 32 F R kW Active Power B 0x234 40565 32 F R kW Active Power C 0x236 40567 32 F R kW Reactive Power A 0x238 40569 32 F R kVAR Reactive Power B 0x23A 40571 32 F R kVAR Reactive Power C 0x23C 40573 32 F R kVAR Apparent Power A 0x23E 40575 32 F R kVA Apparent Power B 0x240 40577 32 F R kVA Apparent Power C 0x242 40579 32 F R kVA Power Factor A 0x244 40581 32 F R Power Factor B 0x246 40583 32 F R Power Factor C 0x248 40585 32 F R Voltage Angle AB 0x24A 40587 32 F R 9 Voltage Angle BC 0x24C 40589 32 F R 9 Voltage Angle AC 0x24E 40591 32 F R 2 Quadrant A 0x250 40593 32 F R Quadrant B 0x252 40595 32 F R Quadrant C 0x254 40597 32 F R Sliding Window Power 0x256 40599 32 F R kW 5 5 Accumulated Data Registers Accumulated data registers contain energy data accumulated over time from the input channels on the device including real energy apparent energy and reactive energy For instantaneous registers such as power and current see 5 4 Instantaneous Data Registers p 14 There are four blocks of accumulated data
21. Block and CT Shorting Termainls See Elkor s i Block LOAD 4 WIRE SYSTEM The wiring shown is applicable for all CT types In the case of 5A CTs additional grounding may be required as per local electrical codes mV and mA CTs must NOT be grounded or interconnected in any way Each CT wire pair must be terminated at the corresponding input terminals mV and mA CTs must not be used to feed multiple equipment mV and Elkor s mA CTs do not require the use of a shorting mechanism Their outputs are low energy voltage limited CT Orientation on the conductor CT Polarity into the meter and CT phasing relationship to voltage phase MUST be observed for correct meter operation System voltage and CT insulation class typically 600V must be observed ELKOR TECHNOLOGIES INC Page 36 WattsOn Mark II USER MANUAL 8 2 Three Wire Delta Wiring Diagram Three CTs 12 30Vac dc Output Signals to DDC PLC Power Supply or Energy Management Systems MODBUS 5 9099608988886 POWER ADDRESS 0 RELAY KI REAYK2 XBus RS 485 MARK ll GISION ENERGY M DO NOT Ground or interconnect mV mA CTs Interfacing Block Optional Including Dead Front Fuse Block and CT Shorting Termainls See Elkor s i Block SOURCE 8 WIRE SYSTEM The wiring shown is applicable for all CT types In the case of 5A CTs additional grounding may
22. ELINOR WattsOm MARK lil PRECISION ENERGY METER METER USER MANUAL ELKOR TECHNOLOGIES INC Page 2 WattsOn Mark II USER MANUAL Installation Considerations Installation and maintenance of the WattsOn device must only be performed by qualified competent personnel who have appropriate training and experience with electrical high voltage and current installations The WattsOn device must be installed in accordance with all Local and National Electrical Safety Codes WARNING Failure to observe the following may result in severe injury or death e During normal operation of this device hazardous voltages are present on the input terminals of the device and throughout the connected power lines including any potential transformers PTs With their primary circuit energized current transformers CTs may generate high voltage when their secondary windings are open Follow standard safety precautions while performing any installation or service work i e remove line fuses short CT secondaries etc e This device is not intended for protection applications e Do not HIPOT and or dielectric test any of the digital outputs Refer to this manual for the maximum voltage level the meter can withstand e Do not exceed rated input signals as it may permanently damage the device e The power supply input should be connected via a rated 12 35 VDC 24VAC power supply and properly isolated from the line voltage Danger Line volt
23. LKOR TECHNOLOGIES INC Page 4 WattsOn Mark II USER MANUAL 1 INTRODUCTION 1 1 Electrical Wiring Because of possible electrical shock or fire hazards connection of this equipment should only be made by qualified personnel in compliance with the applicable electrical codes and standards 1 2 Disclosure This publication contains information proprietary to Elkor Technologies Inc No part of this publication may be reproduced in any form without prior written consent from Elkor Technologies Inc 1 3 Revision History Version Date Changes Revision 1 October 2014 Original Version Revision 2 December 2014 Clarified reserved registers in tables from section 5 4 1 through to 5 5 4 Corrected default threshold voltage in section 2 1 from 5V to 20V Corrected frequency channel selection in section 5 6 15 to state that changes occur on voltages below 5V Revision 3 February 2015 Corrected description of Report Slave ID in Appendix B to include the byte count Revision 4 September 2015 Added Total Capacitive Reactive Energy FW gt v10 52 1 4 Warranty The WattsOn Mark II is warranted against defective material and workmanship During the warranty period Elkor will repair or replace at its option all defective equipment that is returned freight prepaid There will be no charge for repair provided there is no evidence that the equipment has been mishandled or abused If the equipment is found to be in proper working or
24. Total Net Apparent Energy Revenue 0x1202 44611 32 S R VAh Total Import Energy Revenue 0x1204 44613 32 S R Wh Total Export Energy Revenue 0x1206 44615 32 S R Wh Total Import Apparent Energy Revenue 0x1208 44617 32 S R VAh Total Export Apparent Energy Revenue 0x120A 44619 32 S R VAh Q1 Total Reactive Energy Revenue 0x120C 44621 32 S R VARh Q2 Total Reactive Energy Revenue 0x120E 44623 32 S R VARh Q3 Total Reactive Energy Revenue 0x1210 44625 32 S R VARh Q4 Total Reactive Energy Revenue 0x1212 44627 32 S R VARh Q1 Q2 Total Inductive Reactive Energy Revenue 0x1214 44629 32 S R VARh Q3 Q4 Total Capacitive Reactive Energy Revenue 0x1216 44631 32 S R VARh Reserved 0x1218 44633 32 R Reserved 0 121 44639 32 R Net Energy Revenue 0x1220 44641 32 S R Wh Net Energy Revenue B 0x1222 44643 32 S R Wh Net Energy Revenue C 0x1224 44645 32 S R Wh Net Apparent Energy Revenue A 0x1226 44647 32 S R VAh Net Apparent Energy Revenue B 0x1228 44649 32 S R VAh Net Apparent Energy Revenue C 0x122A 44651 32 S R VAh Import Energy Revenue A 0x122C 44653 32 S R Wh Import Energy Revenue B 0x122E 44655 32 S R Wh Import Energy Revenue C 0x1230 44657 32 S R Wh Export Energy Revenue A 0x1232 44659 32 S R Wh Export Energy Revenue B 0x1234 44661 32 S R Wh Export Energy Revenue C 0x1236 44663 32 S R Wh Import Apparent Energy Revenue A 0x1238 44665 32 S R VAh Import Apparent Energy Revenue B 0x123A 44667 32 S R VAh Import Ap
25. WattsOn Mark II USER MANUAL In addition the WattsOn can be configured to measure sliding window also called rolling demand power In this case the time interval is divided into several sub intervals The average power over the full interval is updated each sub interval This device can be configured for up to 60 sub intervals The interval length is equal to the sub interval length times the number of sub intervals If sub intervals are not needed set the sub interval count to 1 Example 1 To configure the device to record the average power over 15 minute intervals set the SW Sub Interval Length register Ox52F to 900 15 minutes x 60 seconds the SW Sub Interval Count register 0x530 to 1 Every 15 minutes the Sliding Window Power registers will update with the average power over the previous 15 minutes Example 2 To configure the device to record the average power over 15 minute intervals updating every 5 minutes set the SW Sub Interval Length register Ox52F to 300 5 minutes x 60 seconds and the SW Sub Interval Count register 0x530 to 3 15 minute intervals 5 minute sub intervals Every five minutes the Sliding Window Power registers will update with the average power over the previous 15 minutes Writing any value to the SW Sub Interval Length register the SW Sub Interval Count register or writing a 1 to the SW Synchronize register restarts the demand interval 5 6 15 Frequency Measurement Channel Frequency
26. age Sensing Inputs The input voltage lines should be protected as per electrical code requirements This is also good practice to facilitate an easy disconnect means for servicing the meter In some cases the voltage may be tapped off of existing fuses or breakers If this is not possible Elkor recommends a 1A or lower fuse fast acting for protection of the installation wiring The WattsOn voltage inputs are high impedance gt 1 5MQ and draw negligible current less than 0 3mA max 3 5 Enclosure Mounting The WattsOn is housed in a UL 94V 0 plastic enclosure intended for either DIN mount installation or wall mounted installation All of the input bottom and output top signals are available on the exterior of the enclosure The unit does not contain any user serviceable parts and thus should not be accessed by the user ELKOR TECHNOLOGIES INC Page 8 WattsOn Mark II USER MANUAL 3 6 Commissioning Flowchart The following chart summarizes the procedure to install and set up the WattsOn device for basic use Connect up to three current transformers to the current input terminals bottom right green on the device Observe the polarity as indicated on the CTs reversing the leads or mounting the CTs backwards will result in negative power and energy accumulation For safety reasons ensure that any live voltages are turned off while connecting the voltage leads Connect line voltage leads to the voltage input terminals bottom
27. ages up to 600 VRMS may be present on the input terminals of the device and throughout the connected line circuits during normal operation These voltages may cause severe injury or death Installation and servicing must be performed only by qualified properly trained personnel Elkor Technologies Inc Elkor reserves the right to make changes to its products and or their specifications without notice Elkor strongly recommends obtaining the latest version of the device specifications to assure the most current information is available to the customer Specifications and manual are available at http www elkor net Elkor assumes no liability for applications assistance customer s system design or infringement of patents or copyrights of third parties by or arising from the use of Elkor s devices ELKOR TECHNOLOGIES INC SHALL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES SUSTAINED IN CONNECTION WITH ELKOR PRODUCTS EXCEPT TO THE EXTENT PROHIBITED BY APPLICABLE LAW FURTHERMORE ELKOR NEITHER ALLOWS NOR AUTHORIZES ANY OTHER PERSON TO ASSUME FOR IT ANY SUCH OBLIGATION OR LIABILITY Although the information contained in this document is believed to be accurate Elkor assumes no responsibility for any errors which may exist in this publication ELKOR TECHNOLOGIES INC Page 3 WattsOn Mark II USER MANUAL TABLE OF CONTENTS Installation Considerations inonsan aaa 3 LV emu 3 Limitation of Liability
28. arent Power A 0x13E 40319 32 S R VA 10 Apparent Power B 0x140 40321 32 S R VA 10 Apparent Power C 0x142 40323 32 S R VA 10 Power Factor A 0x144 40325 32 S R 10000 Power Factor B 0x146 40327 32 S R B 10000 Power Factor C 0x148 40329 32 S R 10000 Voltage Phase Angle AB 0x14A 40331 32 S R 9 10 Voltage Phase Angle BC 0x14C 40333 32 S R 8 10 Voltage Phase Angle 0x14E 40335 32 S R 2 10 Quadrant A 0x150 40337 32 U R Quadrant B 0x152 40339 32 U R Quadrant 0 154 40341 32 U R Sliding Window Power 0x156 40343 32 S R W 10 ELKOR TECHNOLOGIES INC Page 14 WattsOn Mark II USER MANUAL 5 4 2 Floating Point Instantaneous Data Registers The following registers are 32 bit floating point representations of the measured parameters expressed in IEEE 754 format Unlike the integer registers described above these registers are capable of representing decimal numbers and therefore do not require any scaling Name Offset Address Size Type R W Units Active Power Total 0x200 40513 32 F R kw Reactive Power Total 0x202 40515 32 F R kVAR Apparent Power Total 0x204 40517 32 F R kVA Voltage Average 0x206 40519 32 F R V Voltage L L Average 0x208 40521 32 F R V Current Average 0x20A 40523 32 F R A System Power Factor 0x20C 40525 32 F R E System Frequency 0x20E 40527 32 F R Hz Voltage Average Angle 0x210 40
29. asic The firmware version of the device such as 1 00 VendorUrl 3 0x03 Standard Regular http www elkor net ProductName 4 0x04 Standard Regular WattsOn Mark II ModelName 5 0x05 Standard Regular The device s model name for example W2 M1 mA UserApplicationName 6 0x06 Standard Regular Elkor Firmware HardwareRevision 128 0x80 Extended The hardware version on the device such as 1 00 BootloaderRevision 129 0x81 Extended The bootloader version on the device such as 1 00 SerialNumber 130 0x82 Extended The serial number of the device such as 12345 DeviceID 131 0x83 Extended 130 ELKOR TECHNOLOGIES INC Page 12 WattsOn Mark II USER MANUAL 5 REGISTER MAP 5 1 Register Addressing Conventions There are several different conventions for specifying the address of a particular register Various conventions are used in different software programs PLCs and other devices Three common conventions are described below e Offsets Addresses are presented as hexadecimal numbers shown with the Ox Examples prefix with the first address starting at address 0 This is how addresses are Offset 0 0 transmitted digitally over the serial cable and many software packages describe PLC style 40001 Modbus addresses Register No 1 e PLC style addresses Addresses are presented as 5 digit decimal numbers starting Offset 0x10 with a 3 or a 4 indicating whether they are consi
30. attsOn meter ie Elkor i Block mV and Elkor s mA CTs feature voltage limited outputs and shorting mechanisms may be omitted Grounding may be required for 5A CTs only 5A WattsOn models have isolated current inputs and 5A CT grounding is permissible For two element systems 3 wires grounding of CTs and PTs should be carefully observed For mV and mA meter models CTs must not be grounded or interconnected with each other or any device Each CT wire pair must be terminated at the corresponding meter current inputs CT Orientation on the conductor CT Polarity into the meter and CT phasing relationship to voltage phase MUST be observed for correct meter operation ELKOR TECHNOLOGIES INC Page 40 WattsOn Mark II USER MANUAL 9 APPENDIX B MODBUS PROTOCOL DETAILS Modbus RTU is a protocol used to read and write information from a variety of devices such as the WattsOn Generally the details of the protocol are handled by the Modbus master software or device so that the user need not be familiar with their implementation For full details regarding the Modbus protocol see the official Modbus specification available for free from http www modbus org specs php This section summaries the Modbus RTU protocol as it pertains to the WattsOn device 9 1 Modbus Frames Modbus messages are represented as frames of no more than 256 bytes each The start of a frame is defined as no transmissions for at least 3 5 character
31. be required as per local electrical codes mV and mA CTs must NOT be grounded or interconnected in any way Each CT wire pair must be terminated at the corresponding input terminals mV and mA CTs must not be used to feed multiple equipment mV and Elkor s mA CTs do not require the use of a shorting mechanism Their outputs are low energy voltage limited CT Orientation on the conductor CT Polarity into the meter and CT phasing relationship to voltage phase MUST be observed for correct meter operation System voltage and CT insulation class typically 600V must be observed ELKOR TECHNOLOGIES INC Page 37 WattsOn Mark II USER MANUAL 8 3 Three Wire Delta Wiring Diagram Two CTs NOTE This wiring method may only be used with the 5A input versions 12 30Vac dc Output Signals to DDC PLC Power Supply or Energy Management Systems ssissississs 6 9999988989896 POWER ADDRESS RELAY KI RELAYK2 XB RS 485 MARK Il GISION ENERGY M Interfacing Block Optional Including Dead Front Fuse Block and CT Shorting Termainls See Elkor s i Block SOURCE 3 WIRE SYSTEM WARNING This wiring method works only with 5A meters CTs When using mV or mA CTs the 3 wire 3 CT method must be used see section 3 9 In this configuration additional grounding may be required as per local electrical cod
32. ctor decreases If the phase shift of a particular type of CT is known the WattsOn can compensate for this phase shift either globally or per phase Phase compensation values are entered in hundreds of a degree so a value of 1 represents a 0 01 compensation for lag Some current transformers have the phase shift value printed on the label 5 6 13 Energy Integer Divider It is recommended to read the device using floating point registers if possible as floating point registers can represent arbitrarily large energy values regardless of the scaling applied When using integer accumulated data registers as described in section 5 5 Accumulated Data Registers p 15 only values between 2 147 483 648 and 2 147 483 647 can be read In order to permit reading larger energy values they are first divided by the divider programmed into the Energy Integer Divider register Ox52E by default 100 before they are returned in these registers With the default setting the base resolution of the integer registers is 100 Wh VAh VARh Depending on the size of the system being monitored it may be desirable to use a higher divider if reaching values in excess of 2 billion is anticipated soon or a lower divider for greater resolution Set this register to 1 to read individual Watt hours or VAh VARh or 1000 to read kWh or kVAh kVARh Only multiples of 10 from 1 to 10000 may be used Floating point registers do not make use of this register Exam
33. d while in this mode The 16 bit integer registers are not emulated See the WattsOn 1100 manual for details on these registers With the exception of the CT ratios PT ratios and scratch pad registers the registers in the WattsOn 1100 configuration block are read only other settings must be configured using the WattsOn Mark II configuration registers instead 5 6 10 Power Factor Sign Mode 0 Absolute value The sign of the power factor registers can be determined in several different ways This is summarized in the table to 1 The power factor has the same sign as the real power the right gt Follows reactive power The power factor has the same sign as the reactive power Power quadrants relevant in sign mode 3 are illustrated in Quadrant the diagram below 3 default Positive when the power is in quadrants 1 or 3 Negative when the power is in quadrants 2 or 4 ELKOR TECHNOLOGIES INC Page 24 WattsOn Mark II USER MANUAL Reactive 90 II Leading Power Factor I Lagging Power Factor Active Energy 180 Received 0 Active Energy Delivered ITI Lagging Power Factor IV Leading Power Factor 270 Reactive 5 6 11 Password Protection The WattsOn Mark II features a password protection system The device can be locked to prevent writes to ALL of its registers preventing any settings from being changed or Unlock operations resets reboot
34. der a service fee will be billed to the customer Warranty claims must be made via the original purchaser Standard Warranty duration is one 1 year from date of sale Extended warranties are available to OEMs 1 5 Product Description The WattsOn Mark II Precision Energy Meter utilizes advanced metering technology to implement a multi functional power and energy meter into a small cost effective package WattsOn Mark II incorporates three meters into one to provide a unique solution for monitoring up to single phase split phase and three phase loads The meter provides comprehensive per phase data as well as cumulative data including Volts Amps Real Power Reactive Power Apparent Power Voltage Angle Power Factor and Frequency Quadrant Import Export Net Wh VAh and per Quadrant VARh WattsOn Mark II features full four quadrant metering and all parameters are metered and accumulated on a per phase basis Additionally the meter may be configured with per phase CT ratios allowing for metering asymmetrical loads such as individual building branch circuits Therefore it is possible to use different CT sizes and ratios on each input The unit accepts up to 600V line to line directly without needing potential transformers It may be configured for use with 333mV output CTs mA output CTs such as Elkor s safe mA split and solid core CTs or industry standard 5A CTs The WattsOn Mark II meter features a proven high performance metering a
35. dered input registers which are PLC style 40017 read only or holding registers which are read write respectively The first input Register No 17 register is defined as 30001 and the first holding register is defined as 40001 For ease of integration this device treats both Holding Registers and Input Registers as Offset 0x200 identical therefore either 30000 based addresses or 40000 based addresses will work PLC style 40513 with the WattsOn though only 40000 based addresses can be written to Many PLCs Register No 513 and some other devices describe Modbus addresses in this manner e Register numbers Addresses are presented as decimal numbers with the first register defined as register 1 These are similar to the PLC style addresses described above without 3 or 4 prefix Some software packages describe Modbus addresses in this manner The address of each register is presented in the first two styles in this manual The required convention that is used depends on the Modbus master software or device 5 2 Register Size Modbus registers are defined as each containing 16 bits of information In this document some registers are described as being 32 bits wide rather than 16 In these cases two consecutive registers are concatenated together in order to obtain the 32 bit value Most modern Modbus software and hardware devices understand the notion of 32 bit registers and will do this processing provided the data
36. described in subsequent sections CRC Modbus 16 bit cyclic redundancy checksum This value is described in the following section 9 2 Cyclic Redundancy Checksum Each Modbus frame ends in a cyclic redundancy checksum This is computed from the other bytes in the message when transmitting the message When the message is received the checksum is computed again and checked against the checksum found in the message If the results differ the message was corrupted during transmission Below is a simple algorithm for calculating the CRC value shown in pseudo code The variable 0 77 is defined as the i byte of the message and the variable size denotes the number of bytes in the message The result of each bit of a XOR exclusive or operation is O if the corresponding bits of each input are the same or 1 if the corresponding bits of each input are different crc OxFFFF loop i from to size 1 crc e crc XOR d i loop j from to 7 lsb crc AND 0x0001 crc crc LEFT SHIFT 1 if lsb 1 then crc crc XOR 0xA001 ELKOR TECHNOLOGIES INC Page 41 WattsOn Mark II USER MANUAL 9 3 Read Holding Registers This is the basic command used to read information from the device The structure of its frames is as follows Request Modbus Function Starting Address Register Count Address Code 1 63 3 0 65535 1 125 1 byte 1 byte 2 bytes 2 bytes 2 bytes Response Modbus Function Byte First Value Address Code Cou
37. details on using address 0 ELKOR TECHNOLOGIES INC Page 10 WattsOn Mark II USER MANUAL 4 COMMUNICATION 4 1 Modbus Protocol The WattsOn communicates using Modbus RTU a digital communication protocol over an RS 485 port This protocol is supported by various PC software applications PLCs data logging devices and other Modbus master devices which can be used to communicate with the WattsOn The WattsOn is defined as a Modbus slave device meaning that it responds to queries sent by the Modbus master device A Modbus slave device defines blocks of registers that contain information each with a particular address Each register contains a 16 byte field of data which can be read by the master device The registers defined by the WattsOn are described in section 5 Register Map p 13 For technical details on the Modbus protocol see Appendix B Modbus Protocol Details p 41 or see the official Modbus Application Specification available for free from http www modbus org specs php 4 2 Modbus Functions The WattsOn supports a number of different Modbus functions used to query the device or issue commands Some Modbus software devices require the user specify specific Modbus functions Others are more sophisticated and will automatically use the appropriate functions as needed without requiring detailed knowledge of the Modbus protocol 4 2 1 Supported Functions The WattsOn supports the foll
38. device is now locked the Lock register will read as 1 and the device cannot be written to until unlocked again If the password was incorrect the Lock register will continue to read 0 and the device will remain unlocked 3 Read the Lock register to confirm that it reads 1 indicating that the device is now locked ELKOR TECHNOLOGIES INC Page 25 WattsOn Mark II USER MANUAL iv Changing the Password 1 If the device is locked the Lock register 0x527 reads 1 unlock the device see Ti Unlocking the Device 2 Write a new password any 32 bit number except 0 into the Passcode register Ox527 This register will now read 1 Write 2 to the Zock register 0x529 Write the same password into the Passcode register 0x527 a second time Write 1 to the Zock register The password has now been changed and the device is now locked Read the Zock register to confirm that it now reads 1 indicating that the device is now locked DAA V Removing Password Protection 1 If the device is locked the Lock register 0x527 reads 1 unlock the device see Ti Unlocking the Device 2 Write 0 into the Passcode register 0x527 This register will now read 1 3 Write 2 to the Lock register 0x529 The password protection has now been removed 5 6 12 Phase Compensation Most current transformers have an inherent phase shift This causes inaccuracies in power measurements as the power fa
39. ds are less than 0 1 of the unit s maximum measurement current 200 mA 333 mV or 10A depending on the meter type or less than 5 of the unit s maximum voltage 400 V These percentages can be changed via Modbus To change the threshold at which the current LED turns on write to the Current LED Threshold register at address 0 51 41308 Valid values are between 0 and 1000 representing 0 0 to 100 0 respectively To change the threshold at which the voltage LED turns on write to the Vo tage LED Threshold register at address Ox51C 41309 Valid values are between 0 and 100 representing 0 and 100 respectively These settings apply to all channels The current LEDs also indicate direction of power flow and poor power factor see 2 1 2 Current amp Power Indicators p 7 for details 5 6 8 Resetting Accumulated Energy To reset the resettable accumulated data registers to 0 write the hexadecimal value OxA5A5 decimal value 42405 into the Energy Reset register 0x524 Note that this will not affect that data in the revenue accumulated data registers they will continue to hold their former values despite any resets 5 6 9 WattsOn 1100 Compatibility Mode By writing a 1 to the Compatibility Mode register 0x525 the WattsOn Mark II will emulate a partial register map of the legacy WattsOn 1100 The 32 bit floating point registers from 0x300 to 0x376 as well as the configuration registers from 0x080 to OxO9E are emulate
40. e 0x1701 45890 16 U RW 0 Number of registers in the 3 custom Modbus block Custom Block 3 Register 1 0x1702 45891 16 U RW 0 Custom Block 3 Register 2 0x1703 45892 16 U RW 0 List of register offsets of the registers that will be included in the 3 custom Modbus block Register addresses beyond the count specified in the Size register will be ignored Custom Block 3 Register 126 0x177F 46016 16 U RW 0 Custom Register Map Block 4 Description Custom Block 4 Address 0x1800 46145 16 U RW 0 Modbus offset at which the 4 custom Modbus block will be placed Custom Block 4 Size 0x1801 46146 16 U RW 0 Number of registers in the 4 custom Modbus block Custom Block 4 Register 1 0x1802 46147 16 U RW 0 Custom Block 4 Register 2 0x1803 46148 16 U RW 0 List of register offsets of the registers that will be included in the 4 custom Modbus block Register addresses beyond the count specified in the Size register will be ignored Custom Block 4 Register 126 0x187F 46272 16 U RW 0 ELKOR TECHNOLOGIES INC Page 34 WattsOn Mark II USER MANUAL 7 FIRMWARE UPDATES AND THE BOOTLOADER The WattsOn device contains a bootloader a small program used to update the device s firmware While running in bootloader mode the device supports only the System registers listed in section 5 7 for adjusting Modbus settings and rebooting the device The device enters bootloader mode under three conditions e T
41. ed Multiply the value read from the registers by the value of the Energy Integer Divider register to obtain the units expressed in the Units column of the following tables See 5 6 13 Energy Integer Divider p 26 for details on the Energy Integer Divider register Example If you read the value 45 from the Wet Energy A register and 100 from the Energy Integer Divisor register Multiply 45 by 100 to get a value of 4500 Wh or 4 5 kW on channel A The floating point representations of the energy registers do not use the Energy Integer Divider Register as they can represent arbitrarily large values For this reason reading the floating point registers is recommended However their resolution will decrease as values grow larger ELKOR TECHNOLOGIES INC Page 16 WattsOn Mark II USER MANUAL 5 5 1 Resettable Integer Accumulated Data Registers These registers reflect resets made using the Energy Reset register 0x524 see 5 6 8 Resetting Accumulated Energy p 24 for details Name Offset Address Size Type R W Units Net Total Energy Resettable 0x1000 44097 32 S R Wh Total Net Apparent Energy Resettable 0x1002 44099 32 S R VAh Total Import Energy Resettable 0x1004 44101 32 S R Wh Total Export Energy Resettable 0x1006 44103 32 S R Wh Total Import Apparent Energy Resettable 0x1008 44105
42. er Divider 0x52E 41327 16 U RW 100 Divisor for integer energy values to allow fitting into 32 bits See p 26 SW Sub Interval Length Ox52F 41328 16 U RW 60 The length in seconds of a sub interval for sliding window power See p 26 SW Sub Interval Count 0x530 41329 16 U RW 15 The number of sub intervals for sliding window power See p 26 SW Synchronize 0x531 41330 16 U RW Resets the timer of the sliding window power calculation See p 26 Auto Frequency Channel 0x532 41331 16 B RW True Auto select a valid voltage channel for frequency measurement See p 27 Frequency Active Channel 0x533 41332 16 U RW 0 Voltage channel used to measure frequency 0 1 2 for A See 27 Reserved 0x534 41333 16 R 0 Reserved for future use These registers output 0 when read To ensure compatibility with future versions these registers should not be written to Reserved 0x53F 41344 16 R 0 Scratch Pad Register 1 0x540 41345 16 RW O0 32 registers available for user storage Values written here are stored in non t volatile memory They can be used to store room numbers customer IDs etc Scratch Pad Register 32 Ox54F 41376 16 RW 0 They can be used as 32 16 bit registers or 16 32 bit registers Default values depend on the input type of the device Milliamp units default to 1 333 mV units default to 333 and 5A units default to 5 Because the primary and secondary values are equal for all models the ratios all red
43. ergy Revenue B 0x133A 44923 32 F R kVAh Import Apparent Energy Revenue C 0x133C 44925 32 E R kVAh Export Apparent Energy Revenue A 0x133E 44927 32 F R kVAh Export Apparent Energy Revenue B 0x1340 44929 32 F R kVAh Export Apparent Energy Revenue C 0x1342 44931 32 F R kVAh Q1 Reactive Energy Revenue A 0x1344 44933 32 ls R kVARh Q1 Reactive Energy Revenue B 0x1346 44935 32 F R kVARh Q1 Reactive Energy Revenue C 0x1348 44937 32 F R kVARh Q2 Reactive Energy Revenue A 0x134A 44939 32 F R kVARh Q2 Reactive Energy Revenue B 0x134C 44941 32 F R kVARh Q2 Reactive Energy Revenue C 0x134E 44943 32 F R kVARh Q3 Reactive Energy Revenue A 0x1350 44945 32 F R kVARh Q3 Reactive Energy Revenue B 0x1352 44947 32 F R kVARh Q3 Reactive Energy Revenue C 0x1354 44949 32 F R kVARh Q4 Reactive Energy Revenue A 0x1356 44951 32 F R kVARh Q4 Reactive Energy Revenue B 0x1358 44953 32 F R kVARh Q4 Reactive Energy Revenue C 0x135A 44955 32 F R kVARh ELKOR TECHNOLOGIES INC Page 20 WattsOn Mark II USER MANUAL 5 6 Configuration and Status Registers The following registers are used for configuring the WattsOn 5 6 1 Setting CT Ratios Current transformer CT ratios allow the device to scale the data to report the real world current values on the input of the current transformers Typically the same type of CT is used on all three current channels In this case write the CT ratio primary in the case of 5A or mV CTs or
44. es CT Orientation on the conductor CT Polarity into the meter and CT phasing relationship to voltage phase MUST be observed for correct meter operation System voltage and CT insulation class typically 600V must be observed ELKOR TECHNOLOGIES INC Page 38 WattsOn Mark II USER MANUAL 8 4 Split Phase Wiring Diagram 12 30Vac dc Output Signals to DDC PLC Power Supply or Energy Management Systems is Kl tao V Fra Ks 000 MODBUS 4 DRESS i7 MARK ll GISION ENERGY M lai lo le Ici lo o S 8 8 O o DO NOT Ground or interconnect mV mA CTs Interfacing Block Optional Including Dead Front Fuse Block and CT Shorting Termainls See Elkor s i Block L1 L2 LOAD N SOURCE 8 WIRE SYSTEM The wiring shown is applicable for all CT types In the case of 5A CTs additional grounding may be required as per local electrical codes mV and mA CTs must NOT be grounded or interconnected in any way Each CT wire pair must be terminated at the corresponding input terminals mV and mA CTs must not be used to feed multiple equipment mV and Elkor s mA CTs do not require the use of a shorting mechanism Their outputs are low energy voltage limited CT Orientation on the conductor CT Polarity into the meter and CT phasing relationship to voltage phase MUST be observed f
45. he output when the value either relative or absolute goes below this Minimum duration that the output is triggered in milliseconds If the Trigger Type is set to 0 Relative this is the duration of the pulse If it is set to 1 Absolute 4 the relay will remain triggered for at least this long even if the threshold is crossed Relay K2 Min Duration MERCI ME NM ME 1100 for a shorter period of time To hold indefinitely enter the maximum value 65535 hexadecimal OxFFFF this will hold the event until any register in this block is written Relay K2 Active Mode Ox911 42322 16 U RW 0 N O 0 indicates that the output is normally open 1 indicates that it is normally closed and 2 indicates that the output toggles each time it is triggered Common configurations of the relay outputs are described below 5 6 1 Configuring a Pulse Output The relay outputs may be configured to pulse upon accumulation of a specified quantity of energy To do so follow the steps below 1 Select which energy register to use for pulses such as the Net Total Energy register at address 0x1000 or another register from the list of Resettable Integer Accumulated Data Registers p 17 or Revenue Non Resettable Integer Accumulated Data Registers p 19 Enter the register offset into the Relay K1 Register Offset register 0 900 to pulse on the relay output labelled K1 on the device or into the Relay K2 Register Offset register Ox90A
46. he serial parameters to the desired values by writing to the corresponding Modbus registers Write a 1 to the Serial Commit register 0x605 Set the device s Modbus address to 1 or any non zero value Set the Modbus master device to communicate with the WattsOn at the address and serial settings from step 3 Read any register from the WattsOn using the new settings within 3 minutes to make the change permanent Note that the WattsOn should remain powered during this time or its settings will revert to their previous values N D o ELKOR TECHNOLOGIES INC Page 30 WattsOn Mark II USER MANUAL 5 8 Relay Output Configuration Registers The WattsOn has two highly configurable relay outputs These relays can be configured for pulse output alarm output or status output They are configured using the following Modbus register block Description Offset of an integer data register to control the output Floating point registers Relay K1 Register Offset 0x900 42305 16 U RW 0x1000 cannot be used 0 Indicates whether the output is based on the relative value of the register i e for Relay K1 Trigger Type VE dawo io U RW Relative pulses or the absolute value of the register i e for alarming Relay K1 Upper Bound 0x902 42307 32 S RW 1 ee the output when the value either relative or absolute goes above this Relay K1 Lower Bound 0x904 42309 32 S RW dE the output when the value ei
47. he value OxB001 is written to the Reset to Bootloader register at address Ox60A e The device is restarted with its Modbus address DIP switch set to 0 e device s firmware is corrupt possibly due to a failed attempt to update the firmware While in bootloader mode the device s status LED periodically flashes twice If the device s firmware is corrupt the LED flashes red otherwise it flashes green See section 2 1 1 Status Indicator Codes p 7 for details To exit bootloader mode ensure the Modbus address DIP switch is not set to 0 and either power cycle the unit or write the value 0xAA55 to the Reset to Firmware register at address 0x609 If the device s firmware is corrupt new firmware must be uploaded to the device before it can leave bootloader mode If communications is done via a PC Elkor s software may be used to update the device firmware Please contact Elkor for details on the firmware update protocol if required ELKOR TECHNOLOGIES INC Page 35 WattsOn Mark II USER MANUAL 8 APPENDIX A WIRING DIAGRAMS 8 1 Four Wire Wye Wiring Diagram 12 30Vac dc Output Signals to DDC PLC Power Supply or Energy Management Systems MODELS 6999 8 8 8 8 8 ADDRESS Y RELAY KI RELAYK2 XBus RS 485 MARK Il GISION ENERGY M DO NOT Ground or interconnect mV mA CTs Interfacing Block Optional Including Dead Front Fuse
48. hould remain powered during this time or its settings will revert to their previous values AR Note If the settings do not work with the Modbus master device or if a mistake was made wait 3 minutes or power cycle the device and the previous settings will be restored 5 7 5 Changing Settings from an Unknown Configuration A step by step procedure for changing the serial settings from an unknown configuration is described below Use this procedure if the device settings are not known and communication is not possible 7his procedure requires physical access to the device 1 Set the device s Modbus address to 0 using the hardware rotary switch on the device This sets the device s serial settings to their factory defaults Note 1 In address 0 the WattsOn responds to queries sent from any address This may include queries intended for other devices on the Modbus line It is therefore recommended that any other devices be removed from the Modbus line when performing this procedure Note 2 If the device is powered on while its address is already set to 0 it will enter bootloader mode The serial settings can be changed in either mode but the device must be rebooted with a non zero address once the procedure is complete in order to read the data registers 2 Set the Modbus master device s serial settings to 9600 baud no parity 8 data bits and 1 stop bit ELKOR TECHNOLOGIES INC Page 29 WattsOn Mark II USER MANUAL Set t
49. ified thresholds normally open enter a 0 into the Relay KI K2 Active Mode register 0x907 0x911 have the relay open when the parameter is over under the specified thresholds normally closed enter a 1 into the register To have the relay alternate between being opened and closed each time the parameter crosses a threshold enter a 2 into the register ELKOR TECHNOLOGIES INC Page 32 WattsOn Mark II USER MANUAL 6 CUSTOMIZING THE REGISTER MAP The addresses of each register in the WattsOn may be customized to obtain compatibility with other devices This is done using up to 4 customizable register blocks which can contain any register and may be placed at any address Each customizable register block may contain up to 126 registers The first register in each block is placed at a customizable address and each subsequent register follows it at consecutive addresses This feature is disabled by default To enable this feature write 1 to the Masking Enabled register 0x517 in the Configuration and Status Registers p 21 By default custom register blocks cannot be placed in the same locations as existing registers as doing so complicates troubleshooting To allow placing custom register blocks in the same locations as existing registers write 1 to the Masking Override register 0x518 To create a custom block write the block s starting address to Address register 0x1500 for the first block or 0x1600 0x1700
50. isters aside from the function code ELKOR TECHNOLOGIES INC Page 43 WattsOn Mark II USER MANUAL 9 9 Diagnostic Functions This function contains a series of sub functions used to perform diagnostic operations on the device and the communication line The sub functions are described below 9 9 1 Echo Query Data This function simply returns the data sent to it for testing purposes Request Modbus Function Sub function Data Address Code Code 1 63 8 0 Any value 1 byte 1 byte 1 bytes 2 bytes 2 bytes Response identical to the request Modbus Function Sub function Data Address Code Code 1 63 8 0 The sent value 1 byte 1 byte 1 bytes 2 bytes 2 bytes 9 9 2 Clear Counters This function clears the device s count of all messages slave messages communication errors and exceptions since power up Request Modbus Function Sub function Data always 0 Address Code Code 1 63 8 10 0 1 byte 1 byte 1 bytes 2 bytes 2 bytes Response identical to the request Modbus Function Sub function Data always 0 Address Code Code 1 63 8 10 0 1 byte 1 byte 1 bytes 2 bytes 2 bytes 9 9 3 Return Bus Message Count This function returns a count of all Modbus message this device has seen on the bus since power up regardless of whether they were addressed to this device or another device on the line Request Modbus Function Sub function Data
51. mal value in the units specified by the Units column Example If you read the value 4501 from the Current A register divide 4501 by the scaling factor of 1000 to get a value of 4 501 Amps on channel A Name Offset Address Size Type R W Units Scale Active Power Total 0x100 40257 32 S R W 10 Reactive Power Total 0x102 40259 32 S R VAR 10 Apparent Power Total 0x104 40261 32 S R VA 10 Voltage Average 0x106 40263 32 S R V 100 Voltage L L Average 0x108 40265 32 S R V 100 Current Average Ox10A 40267 32 S R A 1000 System Power Factor 0x10C 40269 32 S R 10000 System Frequency 0 10 40271 32 5 R Hz 1000 Voltage Phase Angle Average 0x110 40273 32 S R 10 System Quadrant 0x112 40275 32 U R Reserved 0 114 40277 32 E R Reserved Ox11E 40287 32 R Voltage A 0x120 40289 32 S R V 100 Voltage B 0x122 40291 32 S R V 100 Voltage C 0x124 40293 32 S R V 100 Voltage AB 0x126 40295 32 S R V 100 Voltage BC 0x128 40297 32 S R V 100 Voltage AC 0x12A 40299 32 S R V 100 Current A 0x12C 40301 32 S R A 1000 Current B 0x12E 40303 32 S R A 1000 Current C 0x130 40305 32 S R A 1000 Active Power A 0x132 40307 32 S R W 10 Active Power B 0x134 40309 32 S R W 10 Active Power C 0x136 40311 32 S R W 10 Reactive Power A 0x138 40313 32 S R VAR 10 Reactive Power B 0x13A 40315 32 S R VAR 10 Reactive Power C 0x13C 40317 32 S R VAR 10 App
52. munication the previous settings will be restored As an additional failsafe when the WattsOn s Modbus address is set to address O via the rotary switch on the unit it will always communicate using default serial settings 9600 baud no parity 1 stop bit While set to address 0 the device responds to Modbus queries addressed to any Modbus address The device may then be reconfigured to the appropriate serial settings Note that once the WattsOn s serial settings are changed the Modbus address must be set to a non zero value before it will begin using the new settings so that the new settings can be confirmed as described in the paragraph above New serial settings cannot be confirmed while in address 0 5 7 4 Changing Settings from a Known Configuration A step by step procedure for changing the serial configuration from a known configuration is described below Use this procedure if communications with the device is established but changes to the Modbus settings are required This procedure does not require physical access to the device it can be done from a remote location Change the desired serial parameters by writing to the corresponding Modbus registers Write a 1 to the Serial Commit register 0x605 Change the Modbus master device s serial settings to match the settings applied to the WattsOn Read any register from the WattsOn using the new serial settings within 3 minutes to make the change permanent Note that the WattsOn s
53. n running This counter is reset when the device is powered off reset or the bootloader is started Writes to this register are permitted if desired to represent a date time or elapsed time counter 5 6 4 Masking Modbus Masking is a feature used to change the Modbus map of the device It can be enabled or disabled by writing a 1 or 0 respectively to the Modbus Enabled register 0x517 Custom Modbus blocks may be configured to exist in the same register address space as the native WattsOn registers this functionality can be enabled by writing a 1 to the Masking Override register 0x518 Otherwise the WattsOn native registers will always override custom register blocks See 6 Customizing the Register Map p 33 for details on this feature 5 6 5 Low Current Noise Filtering When reading very low current values such as below 1 of the unit s full scale noise may become noticeable Due to the design of the analog to digital converters in the device there are slight oscillations at low input values which may appear as reading instability A proprietary noise filtering algorithm is employed by default to filter out noise when reading low current values improving accuracy and increasing the dynamic range of the device However this will result in slower response times for low fluctuating signals The settling time for slowly changing signals is approximately 5 seconds however the settling time is much lower i e under 500 m
54. nnnnnnnnnnnnsnnnntnnnnnnannnnnnnnnnnnannnnnnnnnnnannnnnnnin 38 8 4 Split Phase Wiring Diagram i inten orae ea eat eon eden Ai Ex eu c ee Ead cala ea iau ra aa 39 8 5 CT Wiring alan aaa k LERRA Cra a RETE XAR EAR CUR Aaaa A a 40 9 Appendix B Modbus Protocol Details 1er ieee einen nere enne nn e nnn n enn nnne 41 9 1 Modbus Eratfigs dla th ceca TE eR Cea Seer Ee Ex a e CU ur TR YR Ca TUS aha ees 41 9 2 Cyclic Redundancy CHECKSUM reete uci enean nhan nci ava 41 9 3 Read Holding Registers t rnnt Dre rre Er t e VERE eno ee E t ea ePi pu E Deka Vo ne eee ta pa kon vu ed a ca Fora Fo ke Ta aere una 42 9 4 Read Input Registers as imam A eet eren tere Leia ku evened Lr ob Aeris D EFE Lee oe Fab aae sa 42 9 5 Write Single Register ceret creen ra eon vaa epe ee ka va Ta eo Du ex pa rou ala ente ergo bara aa daa 42 9 6 Write Multiple REGISTERS 2 2 2 2 2 Dor a tak aa aee Cora eb rattan ed p DERE TO LEVE ERE 42 9 7 Mask Write Registel c i iei od ene qe ende odoris d R g 43 9 8 Read Write Multiple Registers sitial drea tete ol eai rd dai 43 9 97 DIAGNOSTIC FUMCUIONS ETE 44 9 10 Get Comm Event Cora A cancel ee te eene ev r 46 9 11 Report SlaVecI D PERETE A ETTA E ETEO s 46 E
55. nt 1 63 3 2 250 Hi byte Lo byte 1 byte 1 byte 1 byte 2 bytes 2 bytes 9 4 Read Input Registers On this device this command is identical to Read Holding Registers above but uses function code 4 instead of 3 9 5 Write Single Register This is the basic command used to write data to a single configuration register The structure of its frames is as follows Request Modbus Function Address Value Address Code 1 63 6 0 65535 Hi byte Lo byte 1 byte 1 byte 2 bytes 2 bytes 2 bytes Response identical to the response Modbus Function Address Value Address Code 1 63 6 0 65535 Hi byte Lo byte 1 byte 1 byte 2 bytes 2 bytes 2 bytes 9 6 Write Multiple Registers This command writes data to multiple configuration registers The structure of its frames is as follows Request Modbus Function Starting Address Register Count First Value Address Code 1 63 16 0 65535 1 123 1 byte 1 byte 2 bytes 2 bytes 1 byte 2 bytes 2 bytes Response Modbus Function Starting Address Register Count Address Code 1 63 16 0 65535 1 123 1 byte 1 byte 2 bytes 2 bytes 2 bytes ELKOR TECHNOLOGIES INC Page 42 WattsOn Mark II USER MANUAL 9 7 Mask Write Register This command is used to modify bits in an individual register based on an AND mask and an OR mask The register is written to based on the result of the following expression Result Current Co
56. nt Absolute Maximum Rating 400 mA RMS mA model 666 mV RMS mV model 20A RMS 5A model Current Burden Input Impedance 1 50 total maximum mA model 800kO minimum 1 2MO typical mV model 0 050 total maximum 5A model Current Wire Size AWG 24 12 solid stranded AWG12 16 recommended for 5A CTs Tightening Torque 7 0 Lb In Voltage 4 4 Lb In Other Outputs Serial RS 485 2 wire Modbus RTU 9600 default to 230400 baud Elkor Expansion Bus Port Relay 2x Solid State Relay Outputs 100 mA 50V max Indicators LEDs for Status Voltage Current Relay State Communication Display Back lit Graphic LCD Display 128x32 DL models only Accuracy Current A 0 05 typical 0 1 max Voltage Line to Neutral V 0 1 typical 0 2 max Voltage Line to Line V 0 2 typical 0 3 max Real Power W 0 1 typical 0 2 max Apparent Power VA 0 1 typical 0 2 max Reactive Power VAR 0 1 typical 0 2 max Energy 0 1 typical 0 2 max Power Factor 0 2 max Frequency 0 01 max Sampling Rate 2 KHz Data Update Time 2 Hz Operating Temperature Environmental 40 C to 70 C Storage Temperature 65 C to 85 C Humidity 10 to 9096 non condensing Mechanical Mass 0 15 kg mA and mV models 0 23 kg 5A DL model Mounting DIN Rail mounting 2 point screw mounting Regulatory Electromagnetic Emissions FCC part 15 Class B residen
57. ntents AND AndMask OR OrMask AND NOT AndMask Example 1 To clear the 1 bit of a register to 0 use an AND mask of OxFFFE and an OR mask of 0x0000 Example 2 To set the 1 bit of a register to 1 use an AND mask of OxFFFE and an OR mask of 0x0001 Example 3 To AND the value of a register with 0x5555 use an AND mask of 0x5555 and an OR mask of 0 The structure of its frames is as follows Request Modbus Function Address And Mask Or Mask CRC Address Code 1 63 22 0 65535 Hi byte Lo byte Hi byte Lo byte CRC 1 byte 1 byte 2 bytes 2 bytes 2 bytes 2 bytes Response identical to the request Modbus Function Address And Mask Or Mask CRC Address Code 1 63 22 0 65535 Hi byte Lo byte Hi byte Lo byte CRC 1 byte 1 byte 2 bytes 2 bytes 2 bytes 2 bytes 9 8 Read Write Multiple Registers This function performs reads and writes in a single command The writes occur before the reads The structure of its frames is as follows Request Modbus Function Read Write Write Count First Value Address Code Starting Starting Address Address 1 63 23 0 65535 0 65535 1 121 Lo byte 1 byte 1 byte 2bytes 2 bytes 2 bytes 2 bytes 1 byte 2 bytes 2 bytes Response Modbus Function Byte First Value CRC Address Code Count E 1 63 23 2 250 Hi byte Lo byte CRC 1 byte 1 byte 1 byte 2 bytes 2 bytes Note The response format for Read Write Multiple Registers is identical to that of Read Holding Reg
58. or correct meter operation System voltage and CT insulation class typically 600V must be observed ELKOR TECHNOLOGIES INC Page 39 WattsOn Mark II USER MANUAL 8 5 CT Wiring Notes Note SOURCE CURRENT INPUT ojo ojo x1 X2 Usually CTs are marked as shown above where the H1 indicates the primary current input and X1 the corresponding secondary current terminal or lead While specifying CTs one should consider both the electrical and mechanical parameters such as primary wire size mounting arrangement insulation level the expected load current and accuracy requirements If the load is unknown the bus rating or better still the transformer size may be used for the maximum current calculations CTs can tolerate large over correct conditions without damage and the WattsOn can accept a 20 continuous input overload 5A CTs are designed to operate with their secondary winding in permanent short or very close to the short condition The 5A WattsOn models provide 0 05Q burden If the secondary winding is open while a primary current is present high voltage will be generated on the output This voltage may create a hazard to the personnel and in some situations it may damage the CT insulation Provisions should be made to short the secondary winding before any re wiring is performed We recommend using a metering Test Switch or CT Shunting Blocks to be wired between 5A CTs PTs and W
59. owing Modbus functions Function Name Function Code Description Read Holding Registers 03 0x03 Reads the data contained in one or more registers identical to function 04 on this device Read Input Registers 04 0x04 Reads the data contained in one or more registers identical to function 03 on this device Write Register 06 0x06 Writes data to a single register Return Query Data 00 0x00 The Diagnostics function is a series of sub Clear Counters 10 0x0A functions that assist in diagnosing communication problems Sgr INE s l See Diagnostic Functions below for details Bus Exception Count 13 0x0D __ on each one Slave Message Count 14 0x0E Get Event Counter 11 0x0B Reads a count of successful messages since power on excluding function 11 messages Write Multiple Registers 16 0x10 Writes data to one or more registers Report Slave ID 17 0x11 Returns various information used to identify this device See Slave ID below Write Mask Register 22 0x16 Modifies data in a single register based on an OR mask and an AND mask Read Write Registers 23 0x17 Writes data to one or more registers and then reads data from one or more registers Read Device ID 43 0x2B 14 0x0E Reads various text strings giving device parameters See Device ID next page 4 2 2 Diagnostic Functions The WattsOn implements various diagnostic functions to assist in verifying and diagnosing communication
60. parent Energy Revenue C 0x123C 44669 32 S R VAh Export Apparent Energy Revenue A 0x123E 44671 32 S R VAh Export Apparent Energy Revenue B 0x1240 44673 32 S R VAh Export Apparent Energy Revenue C 0x1242 44675 32 S R VAh Q1 Reactive Energy Revenue A 0x1244 44677 32 S R VARh Qi Reactive Energy Revenue B 0x1246 44679 32 S R VARh Q1 Reactive Energy Revenue C 0x1248 44681 32 S R VARh Q2 Reactive Energy Revenue A 0x124A 44683 32 S R VARh Q2 Reactive Energy Revenue B 0x124C 44685 32 S R VARh Q2 Reactive Energy Revenue C 0x124E 44687 32 S R VARh Q3 Reactive Energy Revenue A 0x1250 44689 32 S R VARh Q3 Reactive Energy Revenue B 0x1252 44691 32 S R VARh Q3 Reactive Energy Revenue C 0x1254 44693 32 S R VARh Q4 Reactive Energy Revenue A 0x1256 44695 32 S R VARh Q4 Reactive Energy Revenue B 0x1258 44697 32 S R VARh Q4 Reactive Energy Revenue C 0x125A 44699 32 S R VARh ELKOR TECHNOLOGIES INC Page 19 WattsOn Mark II USER MANUAL 5 5 4 Revenue Non Resettable Floating Point Accumulated Data Registers The following registers are 32 bit floating point representations of the accumulated energy parameters expressed in IEEE 754 format These registers do not reflect resets made using the Energy Reset register Name Offset Address Size Type R W Units Net Total Energy Reven
61. periods followed by the Modbus address a one byte number between 1 and 247 and the Modbus function code a one byte number The contents of the frame vary between different function codes At the end of the frame comes a 2 byte checksum value used to verify that the frame was not corrupted during reception Fields of 2 bytes or more including the checksum are transmitted with the most significant byte first big endian order The Modbus master device sends request messages to a slave device which responds with a response message Both request and response messages share the same basic format Start Modbus Function Frame Contents CRC Address Code 3 5 character times 1 byte 1 byte up to 252 bytes 2 bytes Start No transmission for 3 5 character times This is about 3 65 milliseconds with default serial settings Example At a baud rate of 9600 bits per second with one stop bit one character requires 10 bits to transmit one start bit eight data bits and one stop bit Each bit takes 1 9600 seconds to transmit Transmitting 3 5 characters of 10 bits each therefore takes 35 9600 seconds or about 3 65 milliseconds Modbus Address This should match the address indicated on the hardware address switch or match the software configured value if the switch is set to F Function Code Available function codes are described in subsequent sections Frame Contents Varies with the function code as
62. ple 1 Suppose the system is consuming 10 000 kW After 1 hour the WattsOn will accumulate 10 000 000 Wh of energy With a default divider of 100 the energy register would read 100 000 at this time Dividing the maximum value 2 147 483 647 by 100 000 yields about 21 475 hours 2 5 years before the energy will no longer fit into a 32 bit register The divider should be set to a higher value such as 1 000 to extend to use of these registers or floating point may be read instead Example 2 Suppose the system is consuming 100 kW After 1 hour the WattsOn will accumulate 100 000 Wh of energy With a default divider of 100 the energy register would read 1 000 at this time Dividing the maximum value 2 147 483 647 by 1 000 yields about 2 147 484 hours 250 years before the energy will no longer fit into a 32 bit register The divider may be set to a lower value such as 10 to increase the resolution of the energy registers from 100 Wh VAh VARh to 10 Wh VAh VARh 5 6 14 Sliding Window Demand Power Measurement The WattsOn can measure the average power over an arbitrary interval of time called demand power The interval length can be programmed in seconds to any value between 1 and 65 535 seconds Typical values are 1 minute 60 seconds 5 minutes 300 seconds 10 minutes 600 seconds 15 minutes 900 seconds 30 minutes 1800 seconds 1 hour 3600 seconds or any arbitrary value expressed in seconds ELKOR TECHNOLOGIES INC Page 26
63. plus neutral must be wired to the unit WattsOn may be used in three wire systems delta without a distributed neutral as a three element meter three CTs required The 5A meter version may be wired as a two element meter utilizing only two CTs and two PTs When no neutral is present the neutral connection should be omitted Standard wiring principles for electricity meters apply to the WattsOn meter as for any other 3 element electricity meter The polarity of interfacing transformers must be observed The left terminal of each current input connector is always associated with the X1 wire of the responding CT Please refer to Appendix A for details on CT wiring All mV and mA CTs must be wired independently to the corresponding current inputs two wires from each CT without shunts or jumpers mA and mV CTs must NOT be grounded or interconnected with each other or any other components in any way The use of a metering test switch containing fuses for voltage lines and shorting terminals for 5A CTs is recommended A pre assembled Elkor B ock may be used as a convenient and economical solution A CT shorting mechanism is not required for mV and Elkor mA style CTs since these are voltage clamped however appropriate protection fuse or breaker for input line voltages is required See Section 8 Appendix A Wiring Diagrams p 36 for details on wiring the meter for various system configurations 3 4 Fusing of Volt
64. problems The Diagnostic function is divided into a number of sub functions each identified by a sub function code The following table summarizes the diagnostic sub functions implemented by this device Description Sub Function Description Return Query Data 00 0x00 Sends dummy data to the device which is then returned as is Used for testing communication Clear Counters 10 0x0A Clears all counters associated with the communication system including the Bus Message Counter the Bus Comm Error Counter the Bus Exception Counter the Slave Message Counter and the Event Counter also used in function 11 Bus Message Count 11 0x0B Returns the number of messages that the device has detected since power up These messages were not necessarily valid or addressed to this device Bus Comm Error Count 12 0x0C Returns the number of CRC errors detected by the device since power up The messages containing these CRC errors were not necessarily addressed to this device Bus Exception Count 13 0x0D Returns the number of exception responses returned by this device since power up Slave Message Count 14 0x0E Returns the count of messages addressed to this device that were received since power up ELKOR TECHNOLOGIES INC Page 11 WattsOn Mark II USER MANUAL 4 2 3 Slave ID The WattsOn implements function 17 Report Slave ID which returns three separate pieces of information It returns an ID code identifying
65. r 0x504 and the value 7493 to register 0x506 Leave registers 0x503 0x505 and 0x507 at their default values of 1 Note 5A and millivolt CTs are not generally factory tested in this way ELKOR TECHNOLOGIES INC Page 21 WattsOn Mark II USER MANUAL Description Primary CT Ratio All 0x500 41281 16 U RW Secondary CT Ratio All Ox501 41282 16 U RW Primary CT Ratio A 0x502 41283 16 U RW Used for setting the CT ratios of each phase Writing to the All registers Secondary CT Ratio A 0x503 41284 16 U RW globally sets the CT ratios for all of the phases simultaneously If the CT ratios Primary CT Ratio B 0x504 41285 16 U RW are not identical in all three channels the All values are read as 0 See p Secondary CT Ratio B 0x505 41286 16 U RW 21 Primary CT Ratio C 0x506 41287 16 U RW Secondary CT Ratio C 0x507 41288 16 U RW Primary PT Ratio All 0x508 41289 16 U RW 1 Secondary PT Ratio All 0x509 41290 16 U RW 1 Primary PT Ratio A OxSOA 41291 16 U RW 1 Used for setting the PT ratios for each phase Writing to the All registers Secondary PT Ratio A Ox50B 41292 16 RW 1 globally sets the PT ratios for all of the phases simultaneously If the PT ratios Primary PT Ratio B Ox50C 41293 16 U RW 1 are not identical in all three channels the All
66. rchitecture which allows for accurate and extremely high resolution measurements over a very wide dynamic range input The data is updated up to two times per second The true RMS inputs may be used even with distorted waveforms such as those generated by variable frequency drives and SCR loads Information is available via the RS 485 Modbus RTU output port In addition two solid state relay outputs are available and may be software configured for Wh pulse outputs or alarm triggers as well as direction of power An on board graphic LCD display real time clock and data logging is optionally available ELKOR TECHNOLOGIES INC Page 5 WattsOn Mark II USER MANUAL 2 SPECIFICATIONS Control Power Input Rating Inputs 12 35V VDC 24VAC 100 mA max System Types Supported 120 208V Delta Wye 277 480V Delta Wye 347 600V Delta Wye Single phase installations up to 347V RMS Split phase two phase installations Frequency 40 70 Hz Voltage Input Rating 5 to 347V L N 600 V L L Voltage Continued Overload Rating 20 Voltage Absolute Maximum Rating 450V L N 780V L L Voltage Input Impedance 1 5MQ line to neutral minimum 3 0MQ line to line minimum Voltage Wire Size AWG 30 12 solid stranded AWG 16 22 recommended Current Input Rating Up to 200 mA RMS mA model Up to 333 mV RMS mV model Up to 10A RMS 5A model Current Continued Overload Rating 20 Curre
67. ring identifier Address Code 1 63 17 3 249 130 0x00 or A null terminated string OxFF identifying the device 1 byte 1 byte 1 byte 1 byte 1 byte Up to 250 bytes 2 bytes ELKOR TECHNOLOGIES INC Page 46 WattsOn Mark II USER MANUAL ELKOR TECHNOLOGIES INC Page 47 WattsOn Mark II USER MANUAL Elkor Technologies Inc 6 Bainard Street London Ontario N6P 1A8 Tel 519 652 9959 Fax 519 652 1057 www elkor net 2015 Elkor Technologies Inc
68. s etc to be performed Lock Confirm Passcode Change Passcode 2 i Setting a Password 1 Write any 32 bit number except 0 into the Passcode register 0x527 This number is the password Whenever a password has been entered this register will read 1 Write 2 to the Lock register 0x529 Write the same password into the Passcode register 0x527 a second time Write 1 to the Zock register A password has now been set and the device is now locked Read the Zock register to confirm that it now read 1 indicating that the device is now locked Ui oJ P2 Ti Unlocking the Device 1 Write the password into the Passcode register 0x527 This register will read 1 2 Write 0 to the Lock register If the password was correct the device is now unlocked the Lock register will read as 0 and the device can be written to normally If the password was incorrect the Lock register will continue to read 1 and the device will reject all password attempts for the next 5 seconds Once the device has been unlocked it will remain unlocked for 10 minutes or until the device is either manually locked again or rebooted whichever comes first To permanently unlock the device see V Removing Password Protection iii Locking the Device if a password has previously been set 1 Write the password into the Passcode register 0x527 This register will read 1 2 Write 1 to the Lock register If the password was correct the
69. s for signals that change magnitude quickly Note Energy accumulation accuracy is not affected by this setting Filtering may be disabled by writing a 0 to register 0x519 41306 5 6 6 Setting 32 bit Endianness By default the higher order 16 bit word of a 32 bit register is the register with the lower Modbus address and the lower order word is at the higher address Most Modbus software and devices will interpret 32 bit registers this way Writing a 1 to the 32 bit Little Endian register at address Ox51A 41307 configures the WattsOn to reverse the 16 bit word ordering so that the higher order word is at the higher address and the lower order word is at the lower address See the following table for an example For an total active power of 100 000 kW hexadecimal 0x186A0 32 bit Little Endian Mode register 0x51A 0 default 32 bit Little Endian Mode register Ox51A 1 Active Power Total register 0x100 1 0 0001 Active Power Total register 0 100 34 464 0x86A0 Active Power Total register 0x101 34 464 0x86A0 Active Power Total register 0x101 1 0x0001 ELKOR TECHNOLOGIES INC Page 23 WattsOn Mark II USER MANUAL 5 6 7 Setting LED Thresholds The WattsOn features an LED for each of the three current channels and each of the three voltage channels on the device These LEDs are off when there is low current or voltage on the corresponding input channel By default these threshol
70. sed enter a 1 into that register To have the relay toggle between being opened and closed with each pulse enter a 2 into that register 5 8 2 Contiguring a Threshold Alarm Output The relay outputs may be configured to open or close when a register raises above or falls below a certain threshold To do so follow the steps below Instantaneous data registers accumulated data registers or configuration registers may be used 1 4 5 6 Select which register to use for alarming from the list of Integer Instantaneous Data Registers p 14 Enter the register offset into the Relay K1 Register Offset register 0x900 to trigger on the relay output labelled K1 on the device or into the Relay K2 Register Offset register Ox90A to trigger on the relay output labelled K2 on the device Note the scaling factor of that register from the register table Write a 1 into the Relay K1 K2 Register Offset register 0x901 0x902 to indicate absolute mode This causes the relay to trigger above or below set values rather than on relative changes To trigger the output when the parameter rises above a threshold value enter a threshold value into the Re ay K1 K2 Upper Bound register 0x902 0x90C The threshold value should be scaled to match the scaling factor of the register selected in step 1 To only trigger the output when the value falls below a certain threshold write 2 147 483 647 hexadecimal Ox7FFFFFFF into this regi
71. settable 0x1102 44355 32 F R kVAh Total Import Energy Resettable 0x1104 44357 32 F R kWh Total Export Energy Resettable 0x1106 44359 32 E R kWh Total Import Apparent Energy Resettable 0x1108 44361 32 F R kVAh Total Export Apparent Energy Resettable 0x110A 44363 32 F R kVAh Qi Total Reactive Energy Resettable 0x110C 44365 32 F R kVARh Q2 Total Reactive Energy Resettable 0x110E 44367 32 F R kVARh Q3 Total Reactive Energy Resettable 0x1110 44369 32 F R kVARh Q4 Total Reactive Energy Resettable 0x1112 44371 32 F R kVARh Q1 Q2 Total Inductive Reactive Energy Resettable 0x1114 44373 32 F R VARh Q3 Q4 Total Capacitive Reactive Energy Resettable 0x1116 44375 32 ls R VARh Reserved 0x1118 44377 32 R F Reserved Ox111E 44383 32 R Net Energy Resettable A 0x1120 44385 32 F R kWh Net Energy Resettable B 0x1122 44387 32 F R kWh Net Energy Resettable C 0x1124 44389 32 F R kWh Net Apparent Energy Resettable A 0x1126 44391 32 F R kVAh Net Apparent Energy Resettable B 0x1128 44393 32 ls R kVAh Net Apparent Energy Resettable C 0x112A 44395 32 F R kVAh Import Energy Resettable A 0x112C 44397 32 F R kWh Import Energy Resettable B 0x112E 44399 32 F R kWh Import Energy Resettable C 0x1130 44401 32 F R kWh Export Energy Resettable A 0x1132 44403 32 F R kWh Export Energy Resettable B 0x1134 44405 32 E R kWh Export Energy Resettable C 0x1136 44407 32 F R kWh Import Apparent Energy Resettable A 0x1138 44409 32 F R kVAh Import
72. sion 0x521 41314 16 U R 100 indicates version 1 00 The model number of the device This is expressed as a two byte ASCII Moder Numoer Med a U string 19761 ee the M1 model j ii Input Configuration 0x523 41316 16 U RW 1 for milliamp CTs 2 for mV CTs 3 for 5A CTs 0 for a custom setup Energy Reset 0x524 41317 16 U RW Writing OxA5A5 42405 resets the accumulated energy to 0 See p 24 Compatibility Mode 0x525 41318 16 B RW False Enables limited emulation of the WattsOn 1100 s register map See p 24 Power Factor Sign Mode 0x526 41319 16 U RW Quad Indicates how the sign of the power factor is calculated See page 24 Passcode 0x527 41320 32 U RW Used for entering a passcode when locking or unlocking the device See p 25 0 indicates unlocked 1 indicates locked With a passcode entered above Lock RWO write 0 to unlock 1 to lock or 2 to change pasada See p 25 Phase Compensation All 0x52A 41323 16 S RW 0 Compensates for the inherent phase shift in current transformers for more Phase Compensation A 0x52B 41324 16 S RW 0 accurate power measurements Represented in units of 0 01 degrees Writing Phase Compensation B 0x52C 41325 16 S RW 0 to the All register sets the phase compensation values for all phases simultaneously If the values are not identical in all three channels the All Phase Compensation C Ox52D 41326 16 5 RW 0 register reads as 0 See p 26 Energy Integ
73. ster to disable the high threshold Example To activate the relay whenever the Vo tage A value rises above 130V enter the value 13000 the Voltage A register has a scaling factor of 100 To trigger the output when the parameter falls below a threshold value enter a threshold value into the Relay K1 K2 Lower Bound register 0x904 0x90E The threshold value should be scaled to match the scaling factor of the register selected in step 1 To only trigger the output when the value rises above a certain threshold write 2 147 483 648 hexadecimal 0x80000000 into this register to disable the low threshold Example To activate the relay whenever Voltage A value falls below 90V enter the value 9000 the Voltage A register has a scaling factor of 100 Enter the desired minimum duration of trigger in milliseconds into the Relay KI K2 Min Duration register 0x906 0x910 For example to ensure that the output is triggered for at least 1 second enter 1000 into that register 0 can be used if no minimum duration is required in that case the alarm output will follow the duration of the event Note that most registers are updated once every 500 milliseconds To hold the alarm indefinitely enter the maximum value of 65535 hexadecimal OxFFFF in this case the alarm can be manually cleared by writing to any register in this register block such as writing 65535 to this register again To have the relay close when the parameter is over under the spec
74. t be present By default the LED is off when the current is less than 0 1 of the full scale input ELKOR TECHNOLOGIES INC Page 7 WattsOn Mark II USER MANUAL 3 INSTALLATION 3 1 Grounding Considerations Output signal ground is usually provided by the controller RTU DDC PLC etc The output common GND IS ISOLATED 3500VAC minimum from the input reference N terminal however the terminal of the input power supply and the output common GND are tied together internally 3 2 Power Supply The power supply must be properly isolated from the measurement line to maintain the required isolation voltage A small dedicated transformer or DIN mount switching power supply is recommended to ensure the best isolation between system components Contact Elkor to purchase recommended accessories For DC power supplies the polarity must be observed For AC power supplies it must be noted that the RS 485 output common G and power supply terminal are tied together Care must be taken if multiple devices are powered using one AC supply to prevent shorting the supply The power supply may be shared by multiple devices 3 3 Line Circuits Wiring The WattsOn meter is a true three element meter that can be used in any electrical system For four wire systems wye with distributed neutral the meter requires current and voltage information from each phase therefore three current transformers CTs and three line voltages
75. t the meter has started in bootloader mode See section 7 Firmware Updates and the Bootloader p 35 for details L 3 E BE for debugging purposes See section 5 7 2 Configuring Serial Parameters 28 Alternating green and red indicates that the Modbus address is set to 0 which is used for details on using address 0 Two periodic red blinks indicates that corrupt firmware has been on the device halting the device in bootloader mode Flashing red indicates a product malfunction that prevents it from reading correctly 2 1 2 Current amp Power Indicators The WattsOn features three indicator LEDs which display the status of the metering inputs The table below summarizes the LED states The LED will not turn on in any state if the input current is less than 0 1 default of the full scale input Code Description Solid green indicates that current is present If voltage is present solid green indicates that active power kW is being imported o A Blinking green indicates that power is being exported Voltage must be present Solid red indicates that active power kW is being mported but absolute reactive power kVAR exceeds absolute active power kW Voltage must be present E ESL ES ESL ES ESL E EL E E Blinking red indicates that active power is being exported but absolute reactive power KVAR exceeds absolute active power KW Voltage mus
76. the most common serial settings 9600 baud no parity 8 data bits 1 stop bit In addition to the default settings the WattsOn supports a variety of other baud rates parity modes and stop bit modes Supported serial settings are listed in the table below Parameter Default Setting Supported Values Baud rate 9600 9600 19200 28800 38400 48000 57600 115200 230400 Parity No Parity 0 No Parity 0 Odd Parity 1 Event Parity 2 Stop bits 1 1 2 Settings are changed by writing to the corresponding Modbus registers To change the baud rate write the new value to the Serial Baud Rate register 0x601 For baud rates below 115200 write the value as is into the register For instance to change the baud rate to 57600 write 57600 to register 0x601 For baud rates equal to or greater than 115200 write only the first three digits into the register this is done because such values are too large to fit into 16 bit registers For instance to change the baud rate to 115200 write 115 to register 0x601 To change the parity mode write a 0 for no parity 1 for odd parity or 2 for even parity into the Seria Parity Mode register 0x602 To change the number of stop bits enter 1 for 1 stop bit or 2 for 2 stop bits into the Seria Stop Bits register 0x603 ELKOR TECHNOLOGIES INC Page 28 WattsOn Mark II USER MANUAL In cases where legacy Modbus master devices cannot process responses fast enough it
77. the number of turns in the case of mA CTs into the Primary CT Ratio All register at address 0x500 Setting the secondary CT ratio register 0x501 is not generally necessary as it will default to the correct value depending on the meter input type 5 for 5A CTs 333 for 333 millivolt CT and 1 for milliamp CTs Example 1 If a 100A 5A CT is being used write the value 100 to register 0x500 Leave register 0x501 at its default value of 5 Example 2 If an Elkor MCTA is being used which has a turns ratio of 2500 write the value 2500 to register 0x500 Leave register 0x501 at its default value of 1 The turn counts of various Elkor Milliamp CTs are listed in the table below Contact Elkor for further details if the CT ratio is unknown A correct setting of the CT ratio is critical to obtaining accurate measurements Current Transformer Number of Turns MCTA 2500 MCTB 4000 MSCT1 7500 MSCT2 7500 MSCT3 7500 MSCT5 11000 MS160 3000 MS360 2000 i Setting CT Ratios Per Channel It is permissible to use different CT ratios in each channel provided the CTs are of the same output type mA 5A or 333mV In this case it is necessary to enter the CT ratio primary in the case of 5A or mV CTs or the number of turns in the case of mA CTs into three separate registers one for each channel Write the value for channels A B and C into registers 0x502 0x504 and 0x506 respectively Setting
78. ther relative or absolute goes below this Minimum duration that the output is triggered in milliseconds If the Trigger Type is set to 0 Relative this is the duration of the pulse If it is set to 1 Absolute the relay will remain triggered for at least this long even if the threshold is crossed Relay L Min Duration 161 RW 100 for a shorter period of time To hold indefinitely enter the maximum value 65535 hexadecimal OxFFFF this will hold the event until any register in this block is written 0 indicates that the output is normally open 1 indicates that it is normally Rey KL Acie Mete VAL RW ONO closed and 2 indicates that the output toggles each time it is triggered Reserved 0x908 42313 16 R 0 Reserved for future use These registers output 0 when read To ensure Reserved 0x909 42314 16 R 0 compatibility with future versions these registers should not be written to Relay K2 Register Offset Ox90A 42315 16 U RW 0x1002 Offset of an integer data register to control the output Floating point registers cannot be used 0 Indicates whether the output is based on the relative value of the register i e for Relay K2 Trigger Type Osos qaae io U RW Relative pulses or the absolute value of the register i e for alarming Relay K2 Upper Bound 0x90C 42317 32 S RW 1 ee the output when the value either relative or absolute goes above this Relay K2 Lower Bound Ox90E 42319 32 S RW cl t
79. this particular device a status code indicating if the device is running or not and a null terminated text string identifying this particular device Field Data ID Code 130 Status OxFF ON when running normally 0x00 OFF when in bootloader mode Text String An ASCII text string containing the name of the product its input configuration mA mV or 5A and its hardware and software version The string is null terminated meaning a 0 is transmitted after the last character For example Elkor Technologies W2 M1 mA Hardware 1 00 Firmware 1 00 While in bootloader mode the string returned contains the bootloader version for example Elkor Technologies Bootloader 1 00 4 2 4 Device ID The WattsOn implements the Read Device ID function which provides access to various strings that identify various device properties This is sub function 14 OxOE of function 43 0x2B Encapsulated Interface Transport The WattsOn implements this function at the highest Conformity Level of 0x83 basic regular and extended identification stream or individual access Each string called an object is accessed with a number called the object ID The WattsOn defines the following objects which can be read using this function Object ObjectID Category Value VendorName 0 0x00 Standard Basic Elkor Technologies ProductCode 1 0x01 Standard Basic w2 MajorMinorRevision 2 0x02 Standard B
80. tial and industrial Safety UL 508 listed Accuracy ANSI C12 20 Class 0 2 ELKOR TECHNOLOGIES INC Page 6 WattsOn Mark II USER MANUAL 2 1 Indicators A number of indicator LEDs are present on the WattsOn They are described in the table below Label Color Description STATUS Green Red Indicates the status of the device See the Status Indicator Codes below MB Green Red Indicates Modbus RS 485 communication Green indicates transmission red indicates reception Solid red indicates that Modbus is wired backwards and terminals are reversed XB Green Red Indicates Elkor Expansion Bus communication Green indicates transmission red indicates reception Solid red indicates that the Expansion bus is wired backwards and terminals are reversed K1 Yellow Indicates the state of the first relay output Off indicates open on indicates closed K2 Yellow Indicates the state of the second relay output Off indicates open on indicates closed V 3x Green Voltage indicators By default the LED is on when the voltage is greater than 20V I 3x Green Red Current amp Power Indicators See Current amp Power Indicators below 2 1 1 Status Indicator Codes The status indicator uses a variety of patterns to indicate the device s status as described by the following table Code Description EE Solid green indicates that the device is operating normally Two periodic green blinks indicates tha
81. uce to 1 1 regardless of the input type by default ELKOR TECHNOLOGIES INC Page 22 WattsOn Mark II USER MANUAL 5 6 2 Setting PT Ratios Potential Transformer PT ratios allow the device to scale the data to report the real world voltage values on the input of the potential transformers Because the WattsOn can accept up to 600V line to line voltage directly potential transformers are often not required In this case PT ratios may be left at their default values of 1 1 If potential transformers are being used for higher voltages and the same type of transformer is used on all three voltage channels write the PT ratio primary into the Primary PT Ratio All register at address 0x508 and the PT ratio secondary into the Secondary PT Ratio All register at address 0x509 Example If a 600 120V PT is being used that is a PT that outputs 120V when the input voltage is 600V write the value 600 to register 0x508 and the value 120 to register 0x509 It is also permissible to use different PTs in each channel In this case it is necessary to enter the PT ratio primary into three separate registers one for each channel Write the value for channels A B and C into registers Ox50A 0x50C and Ox50E respectively Enter the PT ratio secondary for channels B and C into registers Ox50B 0 500 and Ox50F respectively 5 6 3 Uptime The uptime register reports the number of seconds that the device has bee
82. ue 0x1300 44865 32 F R kWh Total Net Apparent Energy Revenue 0x1302 44867 32 F R kVAh Total Import Energy Revenue 0x1304 44869 32 F R kWh Total Export Energy Revenue 0x1306 44871 32 E R kWh Total Import Apparent Energy Revenue 0x1308 44873 32 F R kVAh Total Export Apparent Energy Revenue 0x130A 44875 32 F R kVAh Q1 Total Reactive Energy Revenue 0x130C 44877 32 F R kVARh Q2 Total Reactive Energy Revenue 0x130E 44879 32 F R kVARh Q3 Total Reactive Energy Revenue 0x1310 44881 32 F R kVARh Q4 Total Reactive Energy Revenue 0x1312 44883 32 F R kVARh Q1 Q2 Total Inductive Reactive Energy Revenue 0x1314 44885 32 S R VARh Q3 Q4 Total Capacitive Reactive Energy Revenue 0x1316 44887 32 S R VARh Reserved 0x1318 44889 32 R F Reserved 0 131 44895 32 R Net Energy Revenue A 0x1320 44897 32 F R kWh Net Energy Revenue B 0x1322 44899 32 F R kWh Net Energy Revenue C 0x1324 44901 32 F R kWh Net Apparent Energy Revenue A 0x1326 44903 32 F R kVAh Net Apparent Energy Revenue B 0x1328 44905 32 ls R kVAh Net Apparent Energy Revenue C 0x132A 44907 32 E R kVAh Import Energy Revenue A 0x132C 44909 32 F R kWh Import Energy Revenue B 0x132E 44911 32 F R kWh Import Energy Revenue C 0x1330 44913 32 F R kWh Export Energy Revenue A 0x1332 44915 32 F R kWh Export Energy Revenue B 0x1334 44917 32 E R kWh Export Energy Revenue C 0x1336 44919 32 F R kWh Import Apparent Energy Revenue A 0x1338 44921 32 F R kVAh Import Apparent En
83. ure versions these registers should not be written to 1 indicates the device firmware is running normally 2 indicates the Device Mode LOr 1 device is in bootloader mode RE SERES 0x609 41546 16 U W 0 lg aa 55 43605 to reboot the unit This register always Write the value 0xB001 45057 to reboot the unit When reset in this way 0 the device will enter bootloader mode This register always reads as 0 5 7 1 Modbus Addresses above 15 Using the rotary switch addresses from 1 15 can be set The switch indicates numbers as hexadecimal values with 1 9 being shown as normal A representing 10 B representing 11 and so on When the rotary switch is set to F 15 the device will instead use an address entered into the Modbus Address register 0 600 which defaults to 15 This allows addresses of 16 or greater to be assigned or allows the address to be configurable conveniently over Modbus Addresses up to 247 can be programmed into this register higher addresses are not allowed under the Modbus specification Changes are not applied until a 1 is written to the Seria Commit register Once the change is applied a read of any register must be performed using the new Modbus address to confirm the change See 5 7 3 Confirming Serial Settings Change p 29 for details 5 7 2 Configuring Serial Parameters By default the WattsOn ships pre configured with
84. x509 to test that the communications are functioning correctly The register should read 12345 0x3039 in hexadecimal ELKOR TECHNOLOGIES INC Page 9 WattsOn Mark II USER MANUAL 3 7 Digital Communications The WattsOn has an RS 485 port which communicates using the Modbus RTU protocol The RS 485 port comes factory programmed with the indicated settings below The baud rate parity and stop bit settings can be changed via Modbus see 5 7 2 Configuring Serial Parameters p 28 Modbus address 1 Baud rate 9600 Parity None Data bits 8 Stop bits 1 Every Modbus device on an RS 485 network must be assigned a unique Modbus Address This address is used to specifically identify the target device for querying by the master Valid Modbus addresses are between 1 247 Using the rotary switch addresses from 1 15 can be set The switch indicates numbers as hexadecimal values with 1 9 being shown as normal A representing 10 B representing 11 and so on When the rotary switch is set to F 15 the device will instead use an address programmed into the unit The internally programmed address defaults to 15 to match the rotary switch setting See section 5 7 1 Modbus Addresses above 15 p 28 for details on setting extended Modbus addresses using Modbus Address 0 is not a valid Modbus address it is used for troubleshooting purposes only See section 5 7 2 Configuring Serial Parameters p 28 for

WattsOn-Mark II Manual - Elkor Technologies Inc.

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