WattsOn - Manual - Elkor Technologies Inc.
Contents
1. Bit Name Description Default 1 Output 2 Selection 0 output 2 represents VARh accumulation 0 1100 model only 1 output 2 represents direction of power flow closed relay represents negative power 2 Reverse W Sign Setting this bit reverses the sign of the real power W calculation and thus energy 0 accumulation 3 Reverse VAR Sign Setting this bit reverses the sign of the apparent power VAR calculation and thus the 0 sign of the power factor as well as energy accumulation 4 Reverse Sequence 0 expected sequence is ACB 0 1 expected sequence is ABC This bit effects the sequence error flag as well as the diagnostic LED 5 Disable Sequence Setting this bit disables the use of the diagnostic LED as sequence error detection 1 This bit should be set for single split phase systems phase sequence has no relevance in these systems 6 Force W Absolute Performs W calculation without sign WARNING This setting applies to accumulation of 0 Wh and pulse signaling 7 Force VAR Absolute Performs VAR calculation without sign WARNING This settings applies to accumulation 0 of VARh pulse signaling and PF calculations also 8 Force PF Absolute When set Performs PF calculation without sign 0 9 Pulse on Wh When set sends pulses output 1 on accumulation of Wh 1 10 Pulse on Wh When set sends pulses output 1 on accumulation of Wh 0 11 Pulse on VARh When set sends pulses output 2 on accumulation of VARh2. values Specific details pertaining to the Modbus Protocol may be found at http www modbus org ELKOR TECHNOLOGIES INC Page 12 WattsOn USER MANUAL 4 4 Modbus Register Function Blocks 4 4 1 Data Registers integer Register Units Description Data Type Scale 0x00 40001 Wh Total Energy Consumption hi 16 32 bit int signed 1 0x01 40002 Total Energy Consumption lo 16 1 0x02 40003 W Total Real Power 16 bit int signed 1 0x03 40004 VAR Total Reactive Power 16 bit int signed 1 0x04 40005 VA Total Apparent Power 16 bit int unsigned 0x05 40006 Volts Average Voltage Line Neutral 16 bit int unsigned 0x06 40007 Volts Average Voltage Line Line 16 bit int unsigned 0x07 40008 Amps Average Current 16 bit int unsigned Total System Power Factor 16 bit int signed 10000 0x09 40010 Hz Frequency 16 bit int unsigned 10 Ox0A 40011 Volts Voltage phase A N line neutral 16 bit int unsigned 10 Voltage phase B N line neutral 16 bit int unsigned 10 Voltage phase C N line neutral 16 bit int unsigned 10 0x0D 40014 Volts Voltage phase A B line line see 4 4 1 16 bit int unsigned Ox0E 40015 Volts Voltage phase B C line line see 4 4 1 16 bit int unsigned Ox0F 40016 Volts Voltage phase A C line line see 4 4 1 16 bit int unsigned 1000 0x11 40018 Amps Current phase B 16 bit int unsigned 1000 0x12 40019 Amps Current phase C 16
3. Function Blocks o 13 4 4 1 User Registers integer 13 4 4 2 User Registers floating point cccccccn 14 4 4 3 User Register Details ooococicocinicinnnos 15 4 4 4 User Config Registers seeen 17 4 5 Configuration Word cccccccccnncinnnnnnnnnnnininaninininans 19 5 Output Interpretation 5 1 Genaro 20 5 2 Unit Calibration Sheet ooooocccininnnonnononananononnnnnos 20 5 3 Analog Output Configuration ee 20 Appendix 1 Wiring Diagrams Appendix 1A Four Wire Wye 00occccccnccccconnos 21 Appendix 1B Three Wire 3 CTS eee 22 Appendix 1C Three Wire 2 CTS 23 Appendix 1D Split Phase 2CTS eee 24 Appendix 2 CT Wiring Notes ooococcncnncnnconnnnaconons 25 ELKOR TECHNOLOGIES INC Page 3 WattsOn USER MANUAL 1 INTRODUCTION 1 1 General 1 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 1 2 Documentation This document was written and released in November 2013 rev 4 0 1 1 3 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 1 4 Warranty The WattsOn Universal Power Transducer is warranted against defective material and wor
4. bit int unsigned 1000 Real Power phase A 16 bit int signed 10 0x14 40021 W Real Power phase B 16 bit int signed 10 0x15 40022 W Real Power phase C 16 bit int signed 10 Reactive Power phase A 16 bit int signed 10 0x17 40024 VAR Reactive Power phase B 16 bit int signed 10 0x18 40025 VAR Reactive Power phase C 16 bit int signed 10 0x19 40026 VA Apparent Power phase A 16 bit int unsigned 10 0x1A 40027 VA Apparent Power phase B 16 bit int unsigned 10 0x1B 40028 VA Apparent Power phase C 16 bit int unsigned 10 Power Factor phase A 16 bit int signed 10000 Power Factor phase B 16 bit int signed 10000 Ox1E 40031 Power Factor phase C 16 bit int signed 10000 Software Version 16 bit int unsigned 10 0x20 40033 Wh Import Energy phase A 32 bit int unsigned 1 0x22 40035 Wh Import Energy phase B 32 bit int unsigned 1 Import Energy phase C 32 bit int unsigned 1 0x26 40039 Wh Total Import Energy A B C 32 bit int unsigned 1 0x28 40041 Wh Export Energy phase A 32 bit int unsigned 1 0x2A 40043 Wh Export Energy phase B 32 bit int unsigned 1 0x2C 40045 Wh Export Energy phase C 32 bit int unsigned 1 0x2E 40047 Wh Total Export Energy A B C 32 bit int unsigned 1 0x30 40049 Wh Net Total Energy phase A 32 bit int signed 1 0x32 40051 Wh Net Total Energy phase B 32 bi
5. permanently disabled at the factory by request Serial Number Read only value representing the serial number of the device factory programmed WattsOn software versions gt 2 0 only Scratchpad Registers Read Write non volatile registers available for storage of user data WattsOn software versions gt 2 0 only Output A B Source These registers are used to specify the measured quantity that will be represented on the respective output The measured quantity is referenced by INTEGER Modbus register offset For example if Current phase A is to be represented on output A register 0x88 should be set to the value 0x10 Note that although ANY Modbus register may be specified into these registers only instantaneous parameters voltage current power frequency power factor will be of any significance ie Energy is an accumulated parameter and may not be represented well via the analog output Output A B OV 10V Values The analog outputs are fully configurable and may be scaled to represent any span and offset The data value represented by OV and by 10V may be entered to define the range of values for a particular quantity Both positive and negative values may be entered thus allowing representation of positive negative quantities ie 5000W OV 5000W 10V therefore OW 5V The values entered into these registers should use the same scaling as is used in the respective data register that is to be represented on the outpu
6. user defined 0x98 40153 0x99 40154 0x9A 40155 0x9B 40156 Ox9C 40157 The default CT ratio is pre programmed as the full scale rating of the meter to 5 ie WattsOn 1100 MCTA 100A would have a Scratch Pad 3 R W any arbitrary 16 bit value user data 16 bit user defined 16 bit user defined 16 bit user defined 16 bit user defined T ojojojojo i Q lo ratio pre programmed as 100 5 Primary Secondary This is used in calculation of the floating point register values The user accessible configuration registers 0x80 0x8E are read write registers and allow the user to modify the parameters of the transducer CT PT Radio Primary and Secondary The CT PT ratio registers may be used as placeholders to store the CT PT ratio primary and secondary values This data may be used by the Modbus Master RTU in calculating true engineering units from integer registers and is used by the WattsOn in floating point register value calculation which include CT PT ratio multipliers Demand Period Defines the amount of time used to calculate the demand period The demand period may be set to between 1 and 45 minutes Debug Contains the fixed value 12345 0x3039 and is read only This register is convenient for use when configuring a system and verifying proper communications Pulse Value Register Configures the number of Wh VARh required to generate one pulse on the Wh or VARh pulse outputs i
7. 0 5 ELKOR TECHNOLOGIES INC Page 15 WattsOn USER MANUAL Power Although individual phase power W VA VAR is represented with a resolution of 0 1W the TOTAL W VA VAR is represented with a resolution of 1W See register scaling in table 4 4 1 This limitation is due to the 16 bit register size Proper CT PT ratio multipliers must be applied just as for the current registers The sign of the power calculation is defined as in the figure below The sign may be reversed in the configuration Alternatively the sign of the power may be ignored in cases where it is known that power will always be either imported or exported The same principles apply for reactive VAR calculations Power Factor WattsOn uses the convention of Capacitive Leading and Inductive Lagging to generate the sign of the VAR calculation and thus power factor The sign of VAR and or Power factor may be reversed using the Configuration Word bit settings to obtain readings using the opposite convention see section 4 5 ACTIVE REACTIVE ACTIVE REACTIVE CAPACITATIVE CURRENT LEADS VOLTAGE 60 0 PF 0 5 V 60 0 PF 0 5 INDUCTIVE CURRENT LAGS ACTIVE ACTIVE VEETA REACTIVE REACTIVE ELKOR TECHNOLOGIES INC Page 16 WattsOn USER MANUAL 4 4 4 User Config Registers Read Write Number 0x80 40129 0x81 40130 0x82 40131 0x83 40132 0x84 40133 Name Demand Pe
8. 1 12 Pulse on VARh When set sends pulses output 2 on accumulation of VARh 0 13 No Voltage LED Flash When set indicates presence of low voltage lt 20Vac on voltage input terminals by 1 diag LED fast flashing 14 32 bit Word Order When set 32 bit registers are sent LSB MSB when clear default order is MSB LSB 0 15 V I Average 0 Vavg lavg are calculated as averages Vavg Va Vb Vc 3 Iavg Ia Ib Ic 3 0 1 Vavg Iavg are calculated as totals Vavg Va Vb Vc Iavg Ia Ib Ic 16 Split 240V Load When set applies algorithm to channel C to determine line to line voltage power and 0 energy see Elkor Application Note AN 306 ELKOR TECHNOLOGIES INC Page 19 WattsOn USER MANUAL Configuration Word Ox8E 40143 Default Values Bit Location 16 15 14 13 12 11 10 8 6 4 1 Default bit 0 0 0 1 0 1 0 1 0 0 0 0 Default hex 1 5 Bit Name Description Default 1 Output 2 Display Stream O output 2 acts as pulse relay normal operation 0 1100 model only 1 output 2 sends output data stream for use with WattsOn DISP 2 Pulse Output Type 0 100ms pulse output 0 1 change of state pulse output 4 3 Baud rate selection Two bits required for configuration Shown in order Bit 4 Bit 3 0 0 0 0 9 600 bps default 0 1 57 600 bps 1 0 19 200 bps firmware v4 8 or greater 1 1 38 400 bps firmware v4 8 or greater 15 to5 Not use
9. Fig 1 WattsOn Isolation Diagram 1 3 Features The WattsOn transducer accepts line voltages up to 600 V directly without the need for Potential Transformers PTs The line input circuitry is galvanically isolated from the outputs The following table summarizes the output features offered by various WattsOn models User Selectable Qh Pulses Power Direction Relay AA User Programmable Two 0 10 VDC Analog Outputs E fo a Table 1 ELKOR TECHNOLOGIES INC Page 5 WattsOn USER MANUAL 2 0 SPECIFICATIONS 2 1 Operating Specifications Environmental Protected Environment Operating Temperature 40 to 60 C Storage Temperature 50 to 85 C Humidity 10 to 90 non condensing Power Supply Requirements 19 24 VAC or 20 30 VDC 100mA max Note The power supply must be properly isolated from the measurement line to maintain the rated isolation voltage 2500 VAC 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 Monitored Power System Parameters Note All line inputs are electrically isolated from the outputs and the chassis Isolation test 2500 V RMS Input Impedance gt 1MQ Wiring System Types 120 208 delta wye 277 480 delta wye 347 600 delta wye Single phase installations up to 347Vrms Split phase two phase installations Frequency 45 to 65 H
10. Indicates state of output relay 1 Yellow LED Qh Indicates state of output relay 2 In 1200 models although the output relay is not present the LED operates as in 1100 models Output Signals depending on model Pulse Output 1 solid state relay lt 50V 150mA maximum load representing Wh accumulation Pulse Output 2 WattsOn 1100 solid state relay lt 50V 150mA maximum load representing Qh accumulation or direction of power flow may also be used to provide data to the WattsOn DISP module Pulse outputs are Form A NO relay contacts configured for 100ms pulse duration by default may be changed for change of state operation see section 4 5 Analog Outputs WattsOn 1200 Two 0 10VDC outputs representing any instantaneous measured parameter Outputs are field configurable via Modbus Digital Communication one RS 485 port 9600 baud 8 N 1 Modbus RTU protocol see section 4 3 for details Information Update Frequency All outputs and data are updated every 500 ms 2 3 Accuracy Specification ANSI C12 20 Class 0 2 Accuracy Certified by NRTL All accuracies at 25 C within 10 to 110 of nominal inputs PF gt 0 5 5 A Input Note Metering grade CTs and PTs are recommended for high accuracy applications Parameter Accuracy of reading Basic Resolution Voltage V 0 5 0 1V Current A 0 2 0 001A 1mA Power W 0 2 0 1W per phase 1W per total Power VA 0 5 0 1VA pe
11. MUST be observed for correct meter operation System voltage and CT insulation class typically 600V must be observed ELKOR TECHNOLOGIES INC Page 22 WattsOn USER MANUAL Appendix 1C Three Wire Delta Wiring Diagram Two CTs NOTE This wiring method may only be used with the 5A input versions Signals to EMS System el OO00 i i outa oleTeTe ere Tere MODBUS ADDRESS an 2 G Pues A output 5 RS 485 RS 485 Modbus RTU 9600 N 8 1 Output 2 1100 Relay output across A 1200 0 10 VDC El KOR l Analog 1 A G Analog 2 B G Technologies Inc Watin Universal Power Transducer zav AC DC LINE VOLTAGE IS WIRED A TO THIS TERMINAL ALWAYS USE APF ROP RIATE CTs DEACTIVATE BEFORE SERVICING see nameplate v2 LE N hi lz k ke b lz e aaa Interfacing Block Optional Including Dead Front Fuse Block and CT Shorting Termainls See Elkor s i Block SOURCE H1 3 WIRE DELTA 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 as per Appending 1B In this configuration additional grounding may be required as per local electrical codes 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 TECHN
12. OLOGIES INC Page 23 WattsOn USER MANUAL Appendix 1D Split Phase Wiring Diagram Two CTs Signals to EMS System OOOO puna lelofolfofofofoto 32 168 421 MODBUS ADDRESS O O Wh A B G G Pulses Output 2 RS 485 RS 485 Modbus RTU 9600 N 8 1 Output 2 1100 Relay output across A 1200 0 10 VDC El ROr Analog 1 A G Analog 2 B G Technologies Inc watcNo Universal Power Transducer LA LINE VOLTAGES WIRED ALWAYS USE APPROPRIATE CTs DEACTIVATE BEFORE SERVICING see nameplate vi v2 v3 N Ii hz ka kz b lz Q 1 DO NOT Ground or interconnect mV mA CTs Interfacing Block Optional Including Dead Front Fuse Block and CT Shorting Termainls See Elkor s l Block L1 LOAD L2 SOURCE SPLIT PHASE 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 typica
13. SELROR nac Universal Power Transducer USER MANUAL Installation Considerations Installation and maintenance of the WattsOn meter should only be performed by qualified competent personnel who have appropriate training and experience with high voltage and current devices The WattsOn meter 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 terminal strips 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 PT fuses short CT secondaries etc e The meter is not intended for protection applications e Do not HIPOT and or dielectric test any of the digital or analog 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 meter e The power supply should be connected via a rated 24VAC VDC power supply and properly isolated from the line voltage Danger Line voltages up to 600 VRMS may be present on the input terminals of the device and throughout the connected l
14. SER MANUAL 4 TRANSDUCER OPERATION 4 1 General The WattsOn meter is ready in a few seconds after the excitation power supply is applied Refer to section 3 5 for LED indication and meanings 4 2 Output Signals 4 2 1 Measurement Rationale The WattsOn meter may be used in any electrical system provided that the input signals are within specifications By using the appropriate PTs and CTs the size of the system measured is virtually limitless The WattsOn is configured to measure all current inputs as a 5A full scale That is it normalizes all current measurements as 0 5A depending on the actual calibrated full scale For this reason every CT type is a CT Ratio multiplier of xxx 5 even if the CT type is not a 5A variety Section 4 4 3 details scaling and data interpretation Whenever possible reading that floating point registers is recommended as the meter does the appropriate scaling in this case 4 2 2 Energy Wh Pulses The WattsOn transducer offers a Form A N O solid state relay output that is triggered after a predefined amount of energy Wh is accumulated These slow pulses can be easily monitored by any standard EMS digital input or by a pulse totalizer or similar counting device By default the relays are configured for a 100ms pulse duration however they can be set to a change of state see section 4 5 By default the amount of Watt hours per one pulse is set to 1 Wh x CT Ratio x PT Ratio This 1 Wh is t
15. ceived including interference that may cause undesired This Class B digital apparatus meets all requirements of the Canadian Interference Causing Equipment Regulations operation ELKOR TECHNOLOGIES INC Page 2 WattsOn USER MANUAL Table of Contents 1 Introduction LL GO iia aa 4 1 2 Product Description cccccccccnononnoraconnonnnnnnononaronnns 4 1 3 Features oca EARRA TARTERA IESE 5 Figure 1 Isolation DiagraM ooocccccicinininnnnnncnss 5 2 Specifications 2 1 Operating Specificati0N oococicnncnnnnonoraarannononnnos 6 2 2 Output Specifications 7 2 3 Accuracy Specification ooooononinonnnnnnononaaranennennnos 7 3 Installation 3 1 Grounding Considerations s sssssrrrrrrrrrerrrnrenns 8 3 2 Power Supply Wiring oomoccnccnnncnnnonnnnanonnnnnnnnonnnns 8 3 3 Line Circuits Wiring ooonoccncnnnnnnnnnnancnnnnnnnanonnnanos 8 3 4 Fusing of Voltage Sensing Inputs s es 8 3 5 Enclosure MOUNtING ceeeeeeeeeeeeeeeeeeeeeeeeeeeeees 9 3 6 Indicators ANd JUMPELS 00ooccccccnncnnnonnnnanennnnnnnnonnnns 9 3 7 Accumulated Energy Reset Procedure 9 4 Transducer Operation 4 1 General aninion 10 4 2 Output Signals serana arannana ania aa 10 4 2 1 Measurement Rationale seee 10 4 2 2 Energy Wh Pulses 10 4 2 3 Analog Output Signals aeee 10 4 2 4 Digital OUtputS ccccccccccccncncnnnnnnnnnnnnnnnnans 10 4 3 Digital Communicati0N ccccccccccnncnnnnininininnnnnnos 11 4 4 Modbus Register
16. d 0 16 Reserved 1 Extended Configuration Word 0x9E 40159 Default Values Bit Location 16 15 14 13 12 11 10 9 8 6 4 1 Default bit 1 0 0 0 0 0 0 0 0 0 0 0 Default hex 8 0 5 1 General CT and PT ratios are used to calculate and properly scale the floating point registers The integer registers do NOT include CT and PT ratios and require proper scaling by the user When reading the integer registers the following considerations must be made PT ratios must be applied to Voltage Power W VA VAR and Energy Wh VAh VARh CT ratios must be applied to Current Power W VA VAR and Energy Wh VAh VARh As such Elkor strongly recommends the use of the Floating Point registers whenever possible This limits calculation errors as the meter does all the appropriate math and scaling internally 5 OUTPUT INTERPRETATION 5 2 Unit Calibration Sheet Each WattsOn meter is shipped with its Unit Calibration Sheet that provides generic factory defined full scale FS values for all outputs These FS values are dependent on the nominal voltage current input and the electrical system configuration programmed at the factory based on order specifications 5 3 Analog Output Configuration WattsOn 1200 versions replace the Qh pulse output with two 0 10VDC analog outputs The analog outputs may be configured by the user in the field Each register may represent any ava
17. e if this register is set to 10 ten Wh must accumulate before a pulse is triggered In this case the pulse value would be 10 Wh VARh per click As with the current and power registers the proper PT CT ratio must be applied to the pulse outputs for proper engineering units Ie if the meter is designed to output 1 pulse per 10Wh and the CT ratio is 800 5 the value of one click becomes 10 800 5 1600 Wh 1 6kWh Setting the Pulse Value Register to a value of 0 sets the output pulse value to 0 1 Wh VARh x CT PT ratios per pulse Ie with a CT ratio of 800 5 the pulse is 16 Wh pulse At settings of 1 or higher gt 1Wh pulse the pulse output is a 100ms contact closure At a setting of 0 0 1Wh pulse the pulse duration is 50ms with a minimum 50ms interval between pulses This may have a bearing on PLC DDC systems as some are incapable of detecting short pulse durations ELKOR TECHNOLOGIES INC Page 17 WattsOn USER MANUAL Reset Register This register is used to reset all of the accumulated energy within the transducer To reset the energy the following sequence must take place 1 Write the value OxA5A5 to the reset register 2 Within 1 second write the value Ox5A5A to the same register The sequence provides a level of safety to prevent accidental deletion of energy information This command will set ALL of the accumulated energy Wh VAh VARh to zero for every phase Energy Reset capabilities may be
18. e Relay and two 0 10VDC Analog Outputs field programmable via RS 485 Modbus RTU to any instantaneous parameter All models come equipped with RS 485 Modbus RTU communications capable of delivering over 40 parameters ELKOR TECHNOLOGIES INC Page 4 WattsOn USER MANUAL The meter is housed in a DIN mount plastic enclosure intended for mounting on a DIN rail inside of an electrical panel or enclosure close to the electrical equipment being monitored Fig 1 illustrates the WattsOn Isolation Layout DIGITAL COMMUNICATION RS 485 d an OS ANALOG OUTPUT SIGNALS 0 10Vdc and OS RELAY PULSES LOW VOLTAGE OO 00000000 2500Vrms ISOLATION BARRIER 2 5KV RATED RESISTORS FORM gt 1Mohm PROTECTIVE IMPEDANCE BARRIER H W A O O O op 000000 NO LINE VOLTAGE OUTSIDE DE THIS AREA 5 347Vac L N 600Vac L L Current Inputs depending on model number INPUTS k i mV 0 1Vac MAX Va Vb Vc N A mA 0 50mA MAX 5A 0 10A MAX see note etl GE ene O a ort E yp Current inputs are always isolated via CTs either internal 5A model or external mV or mA model NOTE THE INPUT LINE VOLTAGE IS USED FOR MEASUREMENT PURPOSES ONLY IE IT IS NOT USED FOR ANY OTHER PURPOSE ON THE BOARD PROTECTIVE IMPEDANCE LIMITS THE MAXIMUM SHORT CIRCUIT CURRENT TO 0 6mA 60uA MAX
19. epresent the upper 16 bit word of the 32 bit integer For example if reading the Total Import Energy register offset 0x26 If 0x26 OxABCD and 0x27 0x1234 then the resulting 32 bit value is OxABCD1234 Floating Point Values WattsOn versions gt 2 2 Floating point values are 32 bit and transferred in the same manner as 32 bit integers MSW followed by LSW For example to read the total energy register 0x00 registers 0x00 and 0x01 must be read and concatenated If 0x00 0x4145 and 0x01 0x70A4 the resulting floating point value is 0x414570A4 which translates to 12 34 Floating point registers INCLUDE the CT and PT multipliers as defined by the registers 0x80 0x83 and are represented in the corresponding engineering units note kilo scaling for power and energy parameters For the floating point values to show the correctly scaled values the CT and PT ratios must be programmed via Modbus The word order MSW LSW may be reversed if required see section 4 5 Voltages WattsOn measures all voltages with reference to the neutral terminal Line to line voltages are calculated based on the assumption that the three phase system consists of phases 120 apart from each other These values are calculated regardless of the actual input connections and may be meaningless for single split or multi phase systems For split phase systems it is correct to sum Va amp Vb to obtain the Vab voltage Data Scaling Integer registe
20. es should be protected as per electrical code requirements This is also good practice to facilitate a 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 ELKOR TECHNOLOGIES INC Page 8 WattsOn USER MANUAL 3 5 Enclosure Mounting The WattsOn is housed in a plastic enclosure intended for DIN mount 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 3 6 Indicators and Jumpers All indication LEDs are located on top of the PCB They may be helpful for wiring operation diagnostics e PWR Green power ON LED indicates the presence of power supply to the transducer e DIAG Red Wiring Diagnostic LED default configuration as follows Steady On Measured Total Power sum of all three phases is negative Sporadic Flash Measured Total Power oscillating around OW Fast Flashing Absense lt 25VAC of voltage on input terminals Double Flash Bootloader error ensure DIP switch is not set to zero all down otherwise contact vendor for more details e Wh Yellow Wh LED indicate
21. he total energy as seen by the WattsOn transducer on its inputs As a result the appropriate CT and PT ratios must be applied to obtain actual energy consumption Pulse value may be changed via Modbus see section 4 4 4 4 2 3 Analog Output Signals The WattsOn 1200 offers two independent 0 10VDC analog signals Each analog output may be configured to represent any instantaneous measured value Each output may be configured by the user via Modbus registers The property represented as well as the scaled value at OV and at 10V may be changed This method allows for maximum flexibility and enables the use of analog signals even for positive negative value measurements by allowing introduction of an offset voltage See chapter 4 4 4 for more information on configuring analog outputs 4 2 4 Digital Outputs The RS 485 digital communication port allows for remote monitoring of all the measured parameters via any Modbus RTU Master device The communication port is factory configured for 9600 N 8 1 The details of this output are described in chapter 4 3 ELKOR TECHNOLOGIES INC Page 10 WattsOn USER MANUAL 4 3 Digital Communications All WattsOn transducer versions are equipped with digital communications and feature a RS 485 digital output port compatible with the Modbus RTU specification The WattsOn functions as a Modbus Slave device and may be addressed between 1 amp 63 4 3 1 Modbus Protocol Specifications Communications Pr
22. ilable 16 bit Modbus parameter See section 4 4 4 for more information about configuring and scaling these registers ELKOR TECHNOLOGIES INC Page 20 WattsOn USER MANUAL Appendix 1A Four Wire Wye Wiring Diagram Signals to EMS System 32 16 8 421 MODBUS ADDRESS O Wh A B G G Pulses Output 2 RS 485 Output 2 1100 Relay output across A 1200 0 10 VDC ELKOR PNS Analog 2 B G Technologies Inc Watin Universal Power Transducer RS 485 Modbus RTU 9600 N 8 1 AN LINE VOLTAGES WIRED ALWAYS USE APPROPRIATE CTs DEACTIVATE BEFORE SERVICING see nameplate V2 v3 N h hz ki kz b lz Q Q 1 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 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 o
23. ine circuits during normal operation These voltages may cause severe injury or death Installation and servicing should be performed only by qualified properly trained personnel Limitation of Liabili 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 FCC Statement This device is classified as a Class B digital device This device complies with Part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference re
24. kmanship 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 order a service fee will be billed to the customer Warranty claims should be made via the original purchaser Standard Warranty duration is one 1 year from date of sale Extended warranties are available to OEMS 1 2 Product Description The WattsOn Universal Power Transducer is a true RMS three phase device designed for Building Automation and Energy Management applications The unit measures electrical parameters including voltage current power frequency power factor and accumulates and stores energy information The information is available on a per phase basis allowing the use of WattsOn in three single phase systems up to three individual loads one three phase load or a combination single split phase load The unit measures true RMS value of voltages and currents and calculates other electrical parameters including energy and rolling window demand power WD Model variations determine the available output types Model 1100 Two Pulse Outputs Normally Open Solid State Relay one representing Wh and the second representing Qh or direction of power flow import export Model 1200 One Wh Pulse Output Normally Open Solid Stat
25. l scaling is 0 10V 0 0001 to 1 0 to 0 0001 however customized scale ranges such as 0 10V 0 6 to 1 0 to 0 6 are also valid The scale range does not have to be symmetrical but for ease of calculation it is recommended that it be configured that way so that 5V unity power factor Note that 0 0001 must be used instead of zero to differentiate between leading and lagging 0 0 power factor In the above example 0 10V 0 6 to 1 to 0 6 The span is 8 0 1 pf units therefore 10V 8 1 25V unit The interpretation should take place from the unity power factor value In this case unity centre point 5V If a value of 6 75V is output this indicates 1 75V above the centre point This translates to 1 75 V 1 25 V unit 1 4 0 1 units 0 14pf We need to SUBTRACT this from the unity power factor centre position to obtain the PF reading Therefore the reading is 1 0 0 14 0 86 We know this is a POSITIVE power factor because the output gt 5V 4 5 Configuration Word The configuration word is used to specify various settings for the transducer The configuration word data is manipulated on the bit level however the register must be read and written on the word 16 bits level Ie to set a bit the master RTU should read the contents of the register set the bit and write it back to the transducer Setting a bit means configuring it as a 1 Configuration Word Bit Ma
26. limited outputs and shorting mechanisms may be omitted e Grounding may be required for 5A CTs on y 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 e 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 e 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 25 WattsOn USER MANUAL Elkor Technologies Inc 6 Bainard Street London Ontario N6P 1A8 Tel 519 652 9959 Fax 519 652 1057 www elkor net 2014 Elkor Technologies Inc
27. lly 600V must be observed ELKOR TECHNOLOGIES INC Page 24 WattsOn USER MANUAL Appendix 2 CT Wiring Notes SOURCE CURRENT INPUT oyo ojo SOURCE Note Usually CTs are marked as shown above where the H1 indicates the primary current input and X1 the corresponding secondary current terminal or lead e 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 e Ifthe 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 e 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 0 050 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 WattsOn meter ie Elkor i Block e mV and Elkor s mA CTs feature voltage
28. ort Energy B 0x34C 40845 KWh Export Energy C 0x34E 40847 KWh Total Export Energy A B C 0x350 40849 KWh Net Total Energy A 0x352 40851 KWh Net Total Energy B 0x354 40853 KWh Net Total Energy C 0x356 40855 KWh Net Total Energy A B C Same As 0x300 0x358 40857 kVARh Inductive Energy A 0x35A 40859 KVARh Inductive Energy B 0x35C 40861 KVARh Inductive Energy C 0x35E 40863 KVARh Total Inductive Energy A B C 0x360 40865 KVARh Capacitive Energy A 0x362 40867 KVARh Capacitive Energy B 0x364 40869 KVARh Capacitive Energy C 0x366 40871 KVARh Total Capacitive Energy A B C 0x368 40873 KVARh Net Total VARh A 0x36A 40875 KVARh Net Total VARh B 0x36C 40877 KVARh Net Total VARh C 0x36E 40879 KVARh Net Total VARh A B C 0x370 40881 KVAh Total VAh A 0x372 40883 KVAh Total VAh B 0x374 40885 KVAh Total VAh C 0x376 40887 KVAh Total VAh A B C Group Description Basic Advanced Detailed Points Registers 16 bit 20 44 56 120 ELKOR TECHNOLOGIES INC Page 14 WattsOn USER MANUAL 4 4 3 User Data Register Details Data Representation 16 bit registers are transferred in the manner defined by the Modbus Protocol Since there is no 32 bit format definition in the Modbus specification 32 bit registers are composed of two 16 bit registers The method of data storage is for the lower offset register to r
29. otocol WattsOn utilizes a subset of Modicon s Modbus RTU slave standard protocol There must be a repeater installed if more than 30 units are on the communications chain Transmission Mode Modbus RTU RS 485 Half Duplex 9600 bps N 8 1 default The baud rate may be selected as 9600 or 57600 by using the extended configuration word Ox9E described on page 20 of this manual To change the baud rate valid communication must be established using the baud rate of the device as configured If the baud rate is not known both may be tried in an attempt to establish communication Elkor recommends not changing the baud rate unless absolutely required For the majority of applications 9600 provides sufficient bandwidth to allow for polling of all parameters more than once per second Communications Principles The WattsOn transducer stores all of its available information in register blocks Modbus function 3 Read Holding Registers registers are used to access the data Some systems denote these registers as 4XXXX where XXXX is the register offset 1 For example register function 3 offset 5 would have an address of 40006 WattsOn implements function 6 and function 16 for single register writes Note that function 16 multiple register writes is implemented in versions gt 2 3 however only single register writes are supported The WattsOn memory map is divided into multiple blocks addresses provided as offsets 0
30. peration System voltage and CT insulation class typically 600V must be observed ELKOR TECHNOLOGIES INC Page 21 WattsOn USER MANUAL Appendix 1B Three Wire Delta Wiring Diagram Three CTs Signals to EMS System OOOO puuuanjlolofofofofofo al O MODBUS ADDRESS O Wh A B G G Power Pulses Output 2 RS 485 24V AC DC RS 485 Modbus RTU 9600 N 8 1 Output 2 1100 Relay output across A 1200 0 10 VDC ELROR fe 2 Analog 2 B G Technologies Inc Watin Universal Power Transducer N LINE VOLTAGEJIS WIRED ALWAYS USE APPROPRIATE CTs DEACTIVATE BEFORE SERVICING see nameplate v1 v2 v3 N h h ki kz ki lz Q Q 1 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 3 WIRE DELTA 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
31. r phase 1VA per total Power VAR 0 5 0 1VAR per phase 1VAR per total Power Factor 0 5 0 0001 Frequency 0 5 0 1Hz Energy 0 2 1Wh Basic resolution must be multiplied by CT and PT ratio for effective resolution per installation Analog Output Accuracy 0 5 of reading 10 to 100 of output voltage ELKOR TECHNOLOGIES INC Page 7 WattsOn USER MANUAL 3 0 INSTALLATION 3 1 Grounding Considerations Output signal ground is usually provided by the controller RTU DDC PLC etc The output common GND IS ISOLATED 2500VAC from the input common N terminal however the terminal of the input power supply and the output common GND are tied together internally 3 2 Power Supply Wiring The power supply to the WattsOn meter may be either 19 24 VAC or 20 30 VDC with at least 100mA of supply current available For DC power supplies the polarity must be observed For AC power supplies it must be noted that the output common GND 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 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 which means that three current transformers CTs and three line voltages plus the neutral mu
32. riod Description Place holders for PT and CT ratios The values here may be used by the Master to calculate actual engineering units from data received Number of minutes to use for sliding window demand calculations Data Type Default 16 bit int unsigned 0x85 40134 0x86 40135 Debug Always outputs 12345 0x3039 for communications debugging routines Number of Wh VARh to accumulate before sending one pulse Pulse Value 16 bit int unsigned 16 bit int unsigned 0x87 40136 0x88 40137 0x89 40138 Reset Register Energy Reset Register See p 19 Output A Source Source data register for Analog Output A Output B Source Source data register for Analog Output B 16 bit int unsigned 16 bit int unsigned 12345 16 bit int unsigned 12345 Ox8A 40139 0x8B 40140 Output B OV Value Data value at OV Output B 16 bit int signed 0 Ox8C 40141 Output A 10V Value Data value at 10V Output A 16 bit int signed 12345 Ox8D 40142 Output B 10V Value Data value at 10V Output B 16 bit int signed 12345 Ox8E 40143 See section 4 5 Configuration Word 16 bit int unsigned 5392 0x95 40150 Serial Number Read only factory programmed 16 bit unsigned 2 gt 0x96 40151 Scratch Pad 1 R W any arbitrary 16 bit value user data 16 bit user defined 0x97 40152 Scratch Pad 2 R W any arbitrary 16 bit value user data 16 bit
33. rs must be calculated using appropriate scaling Many of the registers are represented in engineering units as factors of 10 and require only the insertion of a decimal point This includes voltage frequency and power factor To convert the read value to engineering units simply divide by the scale factor For example to properly scale frequency read register 0x09 and divide by the Scale Factor 10 If the register reads 602 the actual frequency is 60 2 Hz It is EXTREMELY important to understand how current is scaled within the unit Due to the flexibility of the device to incorporate a wide variety of CTs all current inputs are scaled to 5A full scale This means that if a typical 5A CT is used the value of the register will be the actual current that the transducer sees x 1000 ie 2 5A 2500 However if a mA or mV type CTs are used the full scale output value either 333 1000mV in the case of mV output CTs or full scale current as defined by the configuration in the case of mA CTs is scaled to represent the number 5000 This methodology allows for the use of the same scaling formula to perform calculations regardless of the actual type of CT used 5A mV mA The following table lists some examples CT Type Used example Full Scale CT Ratio Multiplier industry standard 800 5 800 5 WattsOn XXXX mV 333 mV Output 200A in 333mV out 200 5 WattsOn XXXX MSCT2 600 mA Output 600A input Elkor MSCT2 60
34. s the energy pulse relay operation relay 1 e Qh Yellow Wh LED indicates the state of relay 2 in WattsOn 1100 models In WattsOn 1200 the LED is for indication only ie the relay output is not available If WattsOn DISP is configured 4 5 relay 2 acts as that data source for the DISP module As such the Qh LED will be on flickering very quickly This is normal and should be used as a diagnostic to ensure that the data output is enabled e Address DIP switch allows device address selection 1 to 63 to be used in Modbus communication 1 is the MSB 6 is the LSB 1 2 3 4 5 Bit 32 16 g 4 WM 1 Examples DOWN DOWN 1 DOWN 5 DOWN DOWN UP UP DOWN Table 2 3 7 Accumulated Energy Reset Procedure Jumper J1 kWh RESET located beside power terminal is used to RESET the device accumulators WARNING The reset action will erase all accumulated energies and is not reversible The reset procedure for the meter is as follows Apply a shunt to short J1 Turn power to the meter off and wait 5 seconds Apply power to the meter At this point all accumulated energies will be set to 0 Wait 5 seconds and remove the jumper from J1 ALNAN Make sure that the shunt is removed from the J1 position otherwise all energy data will be reset upon cycling power to the device Energy may be reset via software see section 4 4 4 ELKOR TECHNOLOGIES INC Page 9 WattsOn U
35. st 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 The wiring diagrams for various power system configurations are shown in Appendix 1 Standard wiring principles for electricity meters apply to the WattsOn meter as for any other 3 element electricity meter The polarity of interfacing transformers should 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 3 for details on CT wiring All mV and Elkor mA CTs must be wired independently to the corresponding current inputs two wires from each CT without and shunts or jumpers mA and mV CTs must NOT be grounded or interconnected with each other or 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 Block 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 clammped however appropriate protection fuse or breaker for input line voltages is requried 3 4 Fusing of Voltage Sensing Inputs The input voltage lin
36. t NOTE When assigning analog outputs the integer registers must be used to define the quantity to be represented on the analog output Values should be entered WITHOUT CT and PT ratios but rather as seen by the meter Ie in a 500A system with 500 5A CTs the value for current must be 5A rather than 500A For example if Frequency is to be represented on output A with 0 10V representing 40Hz 60Hz 1 Register 0x88 0x09 set output A to represent Frequency 2 Register Ox8A 400 set OV value 40Hz 400 3 Register Ox8C 600 set 10V value 60Hz 600 The frequency will now be represented on analog output A Example If a value of 5 5V is measured the following calculation must be performed OV 40Hz 10V 60Hz therefore span 20Hz 5 5V 10V 0 55 20Hz 11Hz Add OV offset 40Hz gt 11Hz 40Hz 51 0 Hz ELKOR TECHNOLOGIES INC Page 18 WattsOn USER MANUAL NOTE Representing Power factor via analog values is slightly more complex The power factor measurement is not linear in that the values increase as they approach the centre unity This is shown in the diagram below 0 0 0 1 0 2 0 3 0 4 0 7 0 4 0 2 0 8 0 9 1 0 0 9 0 8 0 6 0 5 0 3 0 1 0 5 0 6 0 0 0 7 OV lt SV gt 10V Each analog output may be configured to measure power factor in any range Typica
37. t int signed 1 0x34 40053 Wh Net Total Energy phase C 32 bit int signed 1 0x36 40055 Wh Net Total Energy A B C same as 0x00 32 bit int signed 1 0x38 40057 VARh Inductive Energy phase A 32 bit int unsigned 1 0x3A 40059 VARh Inductive Energy phase B 32 bit int unsigned 1 0x3C 40061 VARh Inductive Energy phase C 32 bit int unsigned 1 Ox3E 40063 VARh Total Inductive Energy A B C 32 bit int unsigned 1 0x40 40065 VARh Capacitive Energy phase A 32 bit int unsigned 1 0x42 40067 VARh Capacitive Energy phase B 32 bit int unsigned 1 0x44 40069 VARh Capacitive Energy phase C 32 bit int unsigned 1 0x46 40071 VARh Total Capacitive Energy A B C 32 bit int unsigned 1 0x48 40073 VARh Net Total VARh phase A 32 bit int signed 1 0x4A 40075 VARh Net Total VARh phase B 32 bit int signed 1 0x4C 40077 VARh Net Total VARh phase C 32 bit int signed 1 0x4E 40079 VARh Net Total VARh A B C 32 bit int signed 1 Apparent Energy phase A 32 bit int unsigned 1 0x52 40083 VAh Apparent Energy phase B 32 bit int unsigned 1 0x54 40085 VAh Apparent Energy phase C 32 bit int unsigned 1 0x56 40087 VAh Total Apparent Energy A B C 32 bit int unsigned 1 0x58 40089 WD Sliding Window Real Power Demand Total of phases 16 bit int signed 1 ELKOR TECHNOLOGIES INC Page 13 WattsOn USER MANUAL 4 4 2 Data Registers 32 bit Floa
38. ting Point Address Units Description Group 0x300 40769 kWh Total Energy Consumption 1 0x302 40771 kw Total Real Power 0x304 40773 kVAR Total Reactive Power 0x306 40775 kVA Total Apparent Power 0x308 40777 V Average Voltage L N 0x30A 40779 V Average Voltage L L 0x30C 40781 A Average Current 0x30E 40783 Total System Power Factor 0x310 40785 Hz Frequency 0x312 40787 kw Sliding Window Real Power Demand Total of phases 0x314 40789 V Voltage A N 2 0x316 40791 V Voltage B N 0x318 40793 V Voltage C N 0x31A 40795 V Voltage A B 0x31C 40797 V Voltage B C 0x31E 40799 V Voltage A C 0x320 40801 A Current A 0x322 40803 A Current B 0x324 40805 A Current C 0x326 40807 kW Real Power A 0x328 40809 kW Real Power B 0x32A 40811 kw Real Power C 0x32C 40813 kVAR Reactive Power A 0x32E 40815 kVAR Reactive Power B 0x330 40817 kVAR Reactive Power C 0x332 40819 kVA Apparent Power A 0x334 40821 kVA Apparent Power B 0x336 40823 kVA Apparent Power C 0x338 40825 Power Factor A 0x33A 40827 Power Factor B 0x33C 40829 Power Factor C 0x33E 40831 Fixed Software Version 0x340 40833 KWh Import Energy A 3 0x342 40835 KWh Import Energy B 0x344 40837 KWh Import Energy C 0x346 40839 KWh Total Import Energy A B C 0x348 40841 KWh Export Energy A 0x34A 40843 KWh Exp
39. x00 0x5A User data registers Read Only 0x80 0x8E User config registers Read Write gt 0x8E Factory calibration registers Note the notation used in this manual is decimal except when prefaced by 0x designating hexadecimal ie 45 forty five decimal 0x45 forty five hex or sixty nine decimal ELKOR TECHNOLOGIES INC Page 11 WattsOn USER MANUAL 4 3 2 Modbus Command Framing Command Framing Function 3 Read Multiple Words 8 bytes Address Field Function Code Starting Register Number of Registers e E a T Response Cre soa on ne ome wove ome Command Framing Function 6 Write Single Word 8 bytes Pes e o meme ee Response ore e es meme wm Table 3 4 3 3 Modbus Protocol Implementation e Start of frame No transmission for at least a 3 5 bit period 3 5ms at 9600bps e Address Field Applicable addresses are 1 63 The address must match the one defined on the units DIP switch e Function Code 3 Data Registers 6 Write to Configuration Registers e Starting Register Contains the number of the first register requested functions 3 or the register to write to function 6 e Data Field Contains the number of registers requested functions 3 or the value to write into the appropriate register function 6 e CRC 16 bit CRC Tables 4 4 1 and 4 4 2 show the registers and their definitions All registers consist of two bytes 16 bit integer
40. z Voltage Inputs Direct Input Voltage Max Rated 600 Vrms line to line 347 Vrms line to neutral for 4 wire systems PTs are required for systems over 600 V Input Wire Gauge AWG 12 30 of proper insulation rating as per electrical code AWG 16 22 recommended Current Inputs 5A Standard CTs 0 5 A 20 continued overload 10 A absolute model dependent maximum burden 0 005 2 MAX OR mA Elkor MCT MSCT current sensors Solid Split Core OR mV 333mV or 1000mV output CTs Input Wire Gauge AWG 12 24 of proper insulation rating as per electrical code AWG 12 16 recommended for 5A CTs AWG 16 22 for all other types Absolute Maximum Ratings Voltage 450 V Line to Neutral 780V Line to Line Current 10 A via CTs for 5A input versions Note 7hese are the absolute maximum values that the unit can withstand without damage They are not intended as operating values See Product Name Tag on the enclosure for the Rated Operating Line Parameters ELKOR TECHNOLOGIES INC Page 6 WattsOn USER MANUAL 2 2 Output Specifications Output Indicators Green LED PWR Indicates auxiliary power to the unit Red LED Diag Steady Power is flowing in reverse direction Slow Flashing Sequencing Error see section 4 5 Fast Flashing No voltage detected at input terminals see section 4 5 Repeating Double Flash Hardware error contact Elkor for support Yellow LED Wh
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