MicroTech® Open Protocol Master Panel
Contents
1. WARNING Electric shock hazard Can cause personal injury or equipment damage This equipment must be properly grounded Connections and service to the MicroTech control panel must be performed only by personnel that are knowledgeable in the operation of the equipment being controlled AN CAUTION Static sensitive components A static discharge while handling electronic circuit boards can cause damage to the components Discharge any static electrical charge by touching the bare metal inside the control panel before performing any service work Never unplug any cables circuit board terminal blocks or power plugs while power is applied to the panel NOTICE IM 474 3 3 Use an OPM to provide a single point connection from a third party BAS to a MicroTech network This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with this instruction manual may cause interference to radio communications It has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his or her own expense McQuay International disc2. BK 15V y o A 900 e 901 903 z T1 0 5 AMP 91 910 PO a Y 24V 904 54 909 906 gt lo 9V YIR 24V 55 aN 52 907 905 929 Y TA BL 908 53 O MJ ne EAN TEM ir TD LEVEI HT MICROTECH CONTROLLE PORT B 22 IM 474 3 40 31 0 GND 210 9 VAC 1 ES 9 VAC MCB power connector IM 474 3 Test Procedures A listing of MicroTech related part numbers is included on page 24 If the MCB must be replaced see page 24 LED Diagnostics The MCB LED indications can aid in controller diagnostics If the status LEDs do not operate normally as described in the Component Data section of this manual there is a problem with the MCB Following are troubleshooting procedures for the various symptoms Red LED Remains On If the red LED remains on after the 5 second self test period it is likely that the MCB is defective This also can occur in some instances if there 1s a power supply problem Refer to Troubleshooting Power Problems below Red and Green LEDs Off If all the LEDs do not turn on after power is applied to the controller there is likely a defective component or a problem in the controller s power distribution circuits Refer to Troubleshooting Power Problems below Troubleshooting Power Problems The MCB receives 18 Va
3. Troubleshooting communications problems is limited to the following e Checking the port B voltages e Checking the network wiring integrity e Checking the network addressing 23 Internationa ay I The best way to accomplish these checks is to perform the start up procedures in the Network Commissioning section of this manual If these procedures have been performed and the problem persists obtain factory service MCB Replacement If an MCB board is defective and must be replaced the proper controller software must be loaded into the replacement MCB This can be done either at the factory or at the building site with a PC running Open Protocol Monitor software The factory will download the proper controller software into a replacement MCB board before it is shipped if you include the OPM controller s program code with the replacement MCB part order If the program code is not provided the MCB board will be shipped without software Parts List Component designation Description Part no MCB Microprocessor Control Board 677811B 01 T1 Transformer 115 24 Vac 606308B 01 T2 Transformer 24 18 Vac center tapped 467381B 14 CBI Circuit breaker 7350733 03 Fl Fuse MCB input power 1 5 A Bussman No GDC 1 5A 658296A 01 PC Communications Cable Kit 0057186802 Notes 1 If desired the factory can download the correct software into the replacement MCB prior to shipment See the MCB Replacement section
4. 2 slaves is changed the Program Checksum s value must also be changed The Program Checksum needs to match the EOS Checksum so that the controller program will operate Connecting the Level 2 Trunk Use the following three procedures to commission the level 2 trunk Procedure 1 Communications Cable Check The network communications cable should have been installed in accordance with the instructions in the Field Wiring section of this manual This procedure will verify that there are no shorts or stray voltages anywhere in the communications trunk Before beginning verify that the port B connectors are disconnected from every controller on the trunk 1 Verify that there is no voltage between any conductor and ground Use a voltmeter to test for voltage at the field wiring terminal block or directly on the port B connector not the port itself of the level 1 controller OPM or substitute With one lead on the control panel chassis ground check for voltage at the and ground terminals There should be no AC or DC voltage see the Signal and Terminal columns of Table 7 on page 20 If the conductors are properly terminated this check will test for stray voltage throughout the trunk If you get a 2 or 3 Vdc reading it indicates that one or more powered controllers are connected to the trunk These controllers should be located and disconnected 2 Verify that there are no shorts between any two cond
5. 3 IM 474 3 Network Commissioning NOTICE This section discusses the commissioning of a Micro Tech network Only personnel trained in MicroTech network commissioning procedures are allowed to commission a network This section is for review and guidance Network commissioning training classes are held periodically at McQuay International s Minneapolis location Contact the Controls and Network Systems group for more information on network commissioning training classes and dates Unless special arrangements have been made commissioning an Open Protocol network 1 e the McQuay equipment including only the OPM or its substitute and all MicroTech unit or auxiliary controllers is the responsibility of the McQuay sales representative not the BAS company The purpose of network commissioning is to establish and verify communications between the OPM or its substitute and its networked MicroTech unit or auxiliary controllers It is not to establish and verify unit operation The network commissioning procedure is similar for all level 1 panels used in an Open Protocol environment when two or more unit controllers are included in the network This commissioning section pertains to the OPM but the procedures are similar for the RMS RMC CSC LLLB and CPC panels For additional commissioning requirements of these OPM substitutes refer to their installation manuals Network commissioning can be done independently of the unit commissioning
6. MicroTech 2000 controllers The OPM acts only as a passive communications link between MicroTech controllers and the BAS It does not perform any supervisory control for the various MicroTech controllers connected to it Since all communications are handled by the OPM controller s operating system its application software is virtually nonexistent When an OPM is used all supervisory control e g scheduling overrides chiller sequencing is handled by the BAS When Not to Use an OPM Panel e Only one controller In a situation where there is only one MicroTech controller for example one centrifugal chiller the OPM Panel is not required because a single controller can be directly connected to the BAS This applies equally to every controller listed above in When to Use an OPM Panel including the MicroTech Absorption Gateway and the MicroTech Communications Gateway e Single point connection not required IM 474 3 Other level 1 MicroTech controllers can be used instead of an OPM These controllers perform specific supervisory control but cost more For more on the LWC see IM 437 IM 474 3 Some BAS companies do not require a single point connection to multiple units For example they may be capable of providing a low cost separate connection to every unit ventilator controller in a building In this instance an OPM is not required e MCG and MicroTech 2000 controllers only If a BAS will be connected
7. OPM and the other person can go to each individual unit controller Using a set of radios or other two way communication equipment you can tell each other when a specific controller is connected and whether communications between the controllers is occurring As a result of the previous procedures the network communications connector should be disconnected from the B port at every controller on the trunk except for the OPM Be sure that this is true before beginning this procedure For communications to occur each networked controller must have the proper hex switch setting and the proper voltages at its port B terminals 1 Set the network address hex switch setting to match the address on the engineering schedule Each controller must have a unique address 2 Turn on power to the level 2 controller Refer to the controller installation manuals for information on how to turn on power to each controller If the power was already on turn it off and then on again to set the network address into memory 3 Check the voltages of port B directly on the port The trunk must not be connected to the controller when you do this Use a DC voltmeter to test for proper voltages With the ground lead on the control panel chassis ground check the voltage at the and ground terminals Refer to Table 7 for the correct voltage levels 19 If no voltage or improper voltage levels are found verify that the controller is e
8. above for more information 13600 Industrial Park Boulevard P O Box 1551 Minneapolis MN 55440 USA 612 553 5330
9. cable to terminals B B and GRD in the OPM Panel and to the corresponding port B IM 474 3 IM 474 3 terminals in each of the level 2 controllers Refer to the product specific installation and maintenance manuals to find the correct terminals Note that unit designations are established by the network address not the physical position of the unit in the daisy chain Thus the networked controllers can be wired in any order However it is highly recommended that the installing contractor keep track of the physical order of the controllers on the daisy chained trunk by preparing a schedule This will facilitate troubleshooting any network communications problems that may occur For more on the network address see About the Network Address on page 15 To perform the network wiring 1 Before beginning verify that the port B plug is disconnected from every controller on the communications trunk being wired These plugs will be connected during the commissioning procedure This is a precaution to prevent stray high voltage from damaging the controllers Any voltage more than 12 V can damage the board s communications drivers 2 Connect the network cable in a daisy chain manner as shown in Figure 4 Use caution to ensure that the correct polarity is maintained at each controller Be sure to connect each cable s shield to the controllers as shown in the figure The positive negative and shield ground conductor must
10. loop water alarm control for the heat pumps regardless of how the LWC is connected By providing a separate connection to the BAS the response time can be speeded up significantly reducing the risk of heat pump alarms mechanical safety trips or even equipment damage For example if the loop pumps fail the LWC will generate an alarm The BAS must immediately detect this alarm and then send out a command to stop all heat pump compressors IM 474 3 General Description All Open Protocol applications including those using an OPM require the purchase of an Open Protocol license agreement IM 474 3 The MicroTech Open Protocol Master OPM Panel is a microprocessor based controller that allows other MicroTech controllers to interface with a third party building automation system BAS The OPM Panel is used when single point entry is required to communicate with two or more MicroTech controllers An IBM compatible computer containing MicroTech Open Protocol Monitor software is used to commission the network The Open Protocol Monitor software and license agreement must be purchased in addition to the OPM Panel By using the OPM Panel as an interface the BAS is able to perform the following supervisory functions for MicroTech unit and auxiliary controllers e Set the operating mode e Monitor most controller inputs outputs setpoints parameters and alarms e Set most controller setpoints and parameters e Clear alarms F
11. procedures however if it is done before the units are commissioned care should be taken to assure that the units do not start Before any unit is allowed to operate it must be commissioned in accordance with the instructions in the MicroTech unit controller installation literature see Table 1 on page 3 and the model specific unit installation literature Note This section does not discuss the commissioning procedures for a MicroTech 2000 network For information on that see Bulletin No IM 661 MicroTech Communications Gateway Required Tools To commission the network you need the following tools 1 Voltmeter 2 Ohmmeter 3 PC equipped with Open Protocol Monitor software 4 Cable to connect the PC to a MicroTech controller For more information on the PC and cable see PC Connection on page 13 About the Network Address For network communications to occur each controller in the network must have a unique network address The network address has two parts L2 address and L3 address Each part is a two digit hexadecimal number For example a unit at address 01 0F has an L2 address of 01 and an L3 address of OF decimal 15 The first digit in each part is called the HI digit and the second digit is called the LO digit Thus for the L3 address OF the HI digit is 0 and the LO digit is F Table 6 is a hexadecimal to decimal conversion guide Figure 8 Micro Tech Network Address L2 HI digit L2 LO dig
12. switches that are used to set the OPM Panel s network address A hex switch setting is defined as the HI switch digit followed by the LO switch digit For example a hex switch setting of 2F would have the HI switch set to 2 and the LO switch set to F The OPM Panel s hex switch setting should always be 00 See About the Network Address on page 15 for more information Note You can change the setting of a hex switch with a slotted blade screwdriver that has a 32 inch tip If a hex switch setting is changed power to the MCB must be cycled in order to enter the new setting into memory This can be done by opening and then closing the push button circuit breaker CB1 in the panel Communication Ports The MCB has two communication ports port A and port B Each port has three terminals The Port A Select switch located below the hex switches is used to select the RS 232C or RS 485 data transmission interface standard for port A Moving the switch to the left sets up RS 232C and moving the switch to the right sets up RS 485 The ports have Phoenix type connectors Following are brief descriptions of each port s function Port A Port A is for communications with the BAS using either RS 232C or RS 485 During OPM network commissioning and troubleshooting port A is also used for communications with an IBM compatible PC using RS 232C The default communications rate is 9600 baud For more information see PC Conn
13. the terminations at one or more controllers may have been mixed up Procedure 2 OPM Connection The OPM or its substitute is connected to the trunk first so that the PC can communicate with the level 2 controllers when they are connected 1 Set the OPM s hex switches to 00 level 1 See About the Network Address above for more information 2 Push the circuit breaker CB 1 button to power up the OPM and verify that there is power to the MCB by observing the LEDs 3 Check the voltages of port B directly on the port Use a DC voltmeter to test for proper voltages With the ground lead on the control panel chassis ground check the voltage at the and ground terminals Refer to Table 7 for the correct voltage levels If no voltage or improper voltage levels are found verify that the panel is energized 4 Plug the network communications connector Phoenix or AMP plug into port B Procedure 3 Level 2 Controller Connection This procedure will verify that proper communications have begun for each controller as it is connected to the network You can connect the level 2 controllers in any order however it is better to follow the daisy chain as you proceed This will make troubleshooting easier if communications problems occur Note To verify communications more quickly and easily use two people to commission the network When there are two people one person can stay at the PC connected to the
14. to a series of MicroTech 2000 controllers and no MicroTech controllers the MicroTech Communications Gateway MCG can substitute for an OPM In this instance an OPM is not required Since the MCG 1s considered a MicroTech controller and MicroTech 2000 controllers are not this is just a specific only one controller application e Supervisory control by McQuay In many cases a BAS will perform supervisory control for the MicroTech unit controllers connected to it via an OPM for example the BAS may provide sequencing control for several chillers However this same control may be performed by a MicroTech network controller such as the CSC In this instance an OPM is not required See Alternatives to the OPM Panel below Alternatives to the OPM Panel The following MicroTech network controllers which perform specific supervisory control tasks can substitute for the OPM Panel e Remote Monitoring and Sequencing Panel e Remote Monitoring and Control Panel e Chiller System Controller e Lead Lag Load Balance Panel obsolete e Chiller Plant Controller obsolete Remote Monitoring and Sequencing Panel RMS The RMS Panel networks up to three reciprocating or screw chillers It provides remote monitoring and chiller sequencing control For more information see Bulletin No IM 498 Remote Monitoring and Control Panel RMC The RMC Panel networks up to eight applied rooftop or self contained air conditioning systems It prov
15. B 9 connector and an AMP plug An AMP to Phoenix plug adapter is included The kit part number 1s 0057186802 Table 5 PC Specification Preferred configuration Minimum configuration 486DX processor 66 MHz or better 386SX processor 16 MHz 16 MB of RAM 4 MB of RAM 1 MB free space on hard disk or better 1 MB free space on hard disk 372 floppy disk drive 3 2 floppy disk drive Serial port 9 pin male COM1 or COM2 Serial port 9 or 25 pin male COM1 or COM2 Internal time clock battery backed Internal time clock battery backed Super VGA graphics capability VGA graphics capability MS DOS 6 2 or higher MS DOS 5 0 MicroTech Monitor software for Open Protocol MicroTech Monitor software for Open Protocol Figure 5 RS 232 Cable Pinouts for 9 Pin Serial Ports Female DB 9 AMP Plug Female DB 9 Phoenix Plug Signal Pin Signal Signal Pin i Signal 1 2 GND 1 TD 2 RD 3 TD RD GND Female DB 25 AMP Plug Female DB 25 Phoenix Plug Signal Pin Pin Signal Signal Pin i Signal 1 2 GND 1 TD 2 RD 3 TD RD GND Figure 7 AMP to Phoenix Plug Adapter Cable Cable length 6 Phoenix Type AMP Type IM 474
16. Installation amp Maintenance Data Group Controls Part Number 573897Y Date June 1996 MicroTech Open Protocol Master Panel Open Protocol Master Micro Tech McQuay 1996 McQuay International International Contents SAS A O ee A A oe eee 3 AA AAA A II MRE tee 4 Wh n1to Use ain OPM Panel de 4 Wen Noro Use an OP Mi PANEI aa di 4 Alternatives t0 the OPM Parla e aie chested eg 5 LOOP Walter CONTONE Ronen a S E a ei E AA E cu 5 Generales cross T Componcal Datos att E a AS 7 Microprocessor Control Boarders a AE E aa 8 o A O O A ee a 9 SCA ON a 10 Panel Location and MO ida 10 o as eee dee ack ana ee re 11 ROME esac O A A A O Senos DunseMterna ya benne She 11 Network COMMUMCAIONS E esa ee 11 o A Io o N II A SMT ee 13 NetWork COMES OMA nl 15 About the Network ACTES A ii ciao 15 OPM COn Oller US 17 Connecting the Leve Uan 18 Service Informati N iii A ee Essaie 22 Warine Diaa rai A PE 5 ee ee 22 TeSt Procedure S ES Ne nr D a eat 23 D DA SNOS A a es 23 Troubleshooting Power Problems caia 23 Troubleshooting Communications Problems 23 MOR REPCE TE e eS 24 Pa T E e E a MN LR 24 McQuay AAF and MicroTech are registered trademarks of McQuay International MicroTech 2000 Monitor and Open Protocol are trademarks of McQuay International All other trademarks are the property of their respective owners IM 474 3 Introduction This manual provides information about the MicroTech Open P
17. Off Program inactive checksums corrupt or no power to MCB Software ID MicroTech OPM software is factory installed and tested in each panel prior to shipment The software is identified by a program code also referred to as the Ident The program code is encoded in the controller s memory and is available for display on a PC equipped with Open Protocol Monitor software OPM program codification 1s as follows OPM01B OPM Panel Version numeric Version revision zero then alphabetical Installation Panel Location and Mounting The OPM Panel is suitable for indoor use only Table 4 lists the allowable temperature and humidity ranges Locate the panel at a convenient height and allow adequate clearance for the door swing Mount the panel to the wall with screws or bolts It weighs approximately 30 pounds 14 kg Four 1 4 inch openings are provided at the corners of the panel Panel dimensions are shown in Figure 3 The panel is equipped with special door hinges that have a friction adjustment screw By adjusting this screw you can prevent the door from swinging open or closed unexpectedly Table 4 OPM Panel Environmental Specifications Panel state Temperature Relative humidity Operating 32 100 F 0 37 C 0 95 noncondensing In storage 40 140 F 40 60 C 0 95 noncondensing Figure 3 OPM Panel Dimensions 7 8 22 Dia knockouts 3 on left and right sides Hinge fr
18. be continuous over the trunk Note Refer to the product specific installation and maintenance manuals to find the correct field wiring connections see Table 1 on page 3 PC Connection PC connection to the OPM Panel or its substitute 1s required to commission the network see the Network Commissioning section below A laptop computer is ideal for network commissioning Table 5 shows the specifications for the PC During network commissioning the PC should normally be directly connected to port A on the OPM Port A should be set up for RS 232 by setting the Port A Select switch above port A to 232 If unit controller troubleshooting is required the PC can also be directly connected to the A port on any properly configured level 2 controller The OPM Panel s default port A communications rate 1s 9600 baud however 1t can be changed See the Controller Information Screen sub section of the MicroTech Open Protocol Monitor Software User s Manual for more information on changing the OPM s port configurations Direct Connection An RS 232 communications cable kit that allows a PC to be directly connected to any MicroTech controller is available from McQuay International The part number is 0057186802 The cable has a female DB 9 connector for connection to the PC s 9 pin serial port If the PC has a 25 pin serial port obtain an adapter The cable length is 12 feet If more length is required a twisted shielded pair
19. c center tapped power from transformer T2 Power problems can be caused by a defective component which can either blow a fuse or create an excessive load on the power supply An excessive load can lower the power supply voltages to unacceptable levels Use the following procedure to isolate the problem Note that this procedure may require a spare MCB fuse see parts list Refer to the panel wiring diagram 1 Verify that circuit breaker CB1 is closed 1 Remove the MCB power connector and check for 9 Vac between terminals 2 and 3 on the plug Then check for 9 Vac between terminals 1 and 3 on the plug Readings of 9 12 Vac are acceptable If 9 Vac is present between both sets of terminals go to step 3 If 9 Vac is not present between either set of terminals check transformers T2 and T1 and all wiring between the 115 Vac source and the MCB power connector 2 Remove power from the controller by opening circuit breaker CB1 Check the MCB power supply input fuse F1 with an ohmmeter A good fuse will have negligible resistance through it less than 2 ohms If the fuse is blown replace it Go to step 4 If the fuse is intact the MCB is defective 3 Reconnect the MCB power connector Cycle power to the controller close and then open CB1 and check the power fuse again If the fuse is blown the MCB is defective If the fuse is intact the problem is indeterminate Obtain factory service Troubleshooting Communications Problems
20. cable can be spliced into the kit cable see Cable Specification below If this is done splice the conductors with crimp type butt connectors better or solder best Do not use wire nuts The maximum allowable cable length for direct connection between the PC and a controller is 50 feet Cable Specification A properly terminated twisted shielded pair cable is required to directly connect a PC to a MicroTech controller The cable must meet the following minimum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent It must also be properly terminated to an AMP or Phoenix plug on one end and a female DB 9 or DB 25 connector on the other See Figures 5 and 6 for cable pinouts The OPM uses a Phoenix type connector Several unit controllers and alternatives to the OPM Panel use an AMP type connector The McQuay part number for the Phoenix connector shown in the figures is 497590B 01 The AMP part numbers for the AMP connector shown in the figures are as follows 1 480270 0 plug and 60617 1 female pin terminals Note that some local codes or applications 13 14 may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Note A factory assembled cable that meets this specification is provided with the PC Communications Cable Kit which is available from McQuay International This cable has a D
21. e 7 on page 14 To use the PC 1t must have the Open Protocol Monitor software loaded See Chapter 1 Setting Up the Monitor Program in the MicroTech Open Protocol Monitor Software User s Manual for information on installing the software Establishing Communications When the PC is connected and the OPM Panel is powered up perform the Establishing Communications procedure in Chapter 2 Running the Open Protocol Monitor Program of the MicroTech Open Protocol Monitor Software User s Manual Communications between the PC and the OPM can be established when the Monitor program is started or after it is started Setting Parameters in the OPM Setting up the OPM s parameters consists of two procedures The first procedure is to set up the number of level 2 slaves with the Open Protocol Monitor software The second procedure is to IM 474 3 18 correct the Program Checksum to match the EOS Checksum The Controller Information Screen section in the Open Protocol Monitor Software User s Manual explains how to change the number of level 2 slaves and the Program Checksum The number of level 2 slaves must be set to match the quantity of MicroTech unit or auxiliary controllers connected to the network If the number entered into the Monitor software is less than the actual quantity of controllers in the network you will not know 1f all the controllers are communicating properly with the OPM Panel When the number of level
22. ection on page 13 Note Remote connection with a BAS via modem is not supported Port B Port B is for MicroTech network communications using RS 485 The communications rate is 9600 baud For more information see Network Communications on page 11 IM 474 3 IM 474 3 Microprocessor Status LEDs The green and red LEDs on the MCB provide information about the operating status of the microprocessor Following is the normal start up sequence that the two status LEDs should follow when power is applied to the MCB 1 The red Watchdog LED turns on and remains on for approximately 5 seconds During this period the microprocessor performs a self test The red LED on the side of the bottom half of the MCB assembly performs the same indication 2 The red LED turns off and the green LED starts flashing indicating that the OPM s program is active If the above sequence does not occur after power is applied to the controller there is a problem with the MCB or its power supply For more information refer to the Test Procedures section on page 23 Tables 2 and 3 summarize the red and green status LED indications Table 2 Red Status LED Indication Red LED state Indication On Self test failure or power supply problem Off MCB operating normally or no power to MCB For longer than 5 seconds Table 3 Green Status LED Indication Green LED state Indication Flashing Normal operation On 1 sec Off 1 sec
23. iction adjustment screw No 1 4 6 Dia mounting slots 2 14 3 4 375 14 1 2 368 16 1 2 419 Pa 1 4 6 Dia 2 1 3 4 44 aL E 1 25 z 12 305 4 102 14 356 Left Side View Front View 7 8 22 Dia knockouts 3 on top and bottom 1 7 8 48 7 178 Note Dimensions are in inches millimeters in brackets 12 1 8 308 Bottom View 10 IM 474 3 IM 474 3 Field Wiring Following are descriptions of the various field wiring requirements A typical field wiring diagram is shown in Figure 4 Wiring must comply with the National Electrical Code and all local codes and ordinances The warranty is void if wiring is not in accordance with these instructions Note that the panel is divided into high and low voltage sections by a sheet metal barrier The power wiring should enter the high voltage section The communications wiring should enter the low voltage section Wiring penetrations must be made only through the 7s inch knockouts provided Power WARNING Electric shock hazard Can cause personal injury or death This equipment must be properly grounded All protective deadfront panels must be reinstalled and secured when power wiring is complete The OPM Panel requires a 115 Vac power supply The supply connects to terminals L1 and L2 in the high voltage section of the panel The panel must be properly grounded by connecting the ground lug GRD to earth ground Refer to Figu
24. ides remote monitoring and multiple unit control For more information see Bulletin No IM 444 Chiller System Controller CSC The CSC networks up to four dual compressor centrifugal chillers up to eight single compressor centrifugal chillers up to eight reciprocating or screw chillers or any combination of these that results in eight or fewer unit controllers It provides remote monitoring chiller sequencing control chilled water temperature control and auxiliary control for a variety of chiller plant equipment For more information see Bulletin No IM 618 Lead Lag Load Balance Panel LLLB The LLLB Panel networks two single compressor series 100 centrifugal chillers or the two compressor controllers on a dual compressor series 100 centrifugal chiller It provides compressor lead lag and load balancing control For more information see Bulletin No IM 425 Chiller Plant Controller CPC The CPC networks up to six series 100 centrifugal chiller compressor controllers It provides chiller sequencing and cooling tower control For more information see Bulletin No IM 433 Loop Water Controller The MicroTech Loop Water Controller LWC provides loop water temperature and pump control for a water source heat pump system The LWC can be included in an OPM network but we strongly discourage this practice Instead we recommend that the LWC be given a separate dedicated connection to the BAS The reason 1s that the BAS must coordinate
25. it L3 HI digit gt 13 LO digit 01 0F 15 A controller s address is determined by its hex switch setting and its level in the network The following table shows how the network address 1s defined When the controller is The L2 address is The L3 address is Level 1 Always 00 Always 00 Level 2 The hex switch setting Always 00 Level 3 Read from its level 2 master at power up The hex switch setting After changing a hex switch setting power to the MCB must be cycled to set the new address into memory In the OPM and most other MicroTech panels you can do this by opening and then closing circuit breaker CB1 In the unit controllers this can be done in a variety of ways Refer to the individual installation manuals for more information on cycling power to the unit controller MCBs For more on hex switch settings see Microprocessor Control Board on page 8 Note If any equipment is running shut it down before removing power from the unit controller Follow the shutdown procedures in the manuals listed in Table 1 on page 3 Preparing an Address Schedule In an Open Protocol application the BAS uses the MicroTech network address for communications Therefore the first step in commissioning the network is to talk to the BAS company and decide who will assign the addresses Whoever assigns the addresses should prepare a schedule indicating what the hex switch setting for each controller should be If the schedule is prepared by you you
26. laims any liability resulting from any interference or for the correction thereof Applying the OPM Panel McQuay International has provided several BAS manufacturers licensed access to our MicroTech stand alone controllers This access which is called Open Protocol allows a BAS to monitor status and change limited control parameters in McQuay International HVAC equipment The result is a fully integrated BAS Note that an Open Protocol application does not always require an OPM Panel When to Use an OPM Panel The OPM Panel should be used when there are two or more MicroTech controllers that need to be interfaced with a BAS by means of a single point connection The maximum number of unit controllers per OPM depends on the BAS For example the OPM Panel could combine a McQuay centrifugal chiller a McQuay applied rooftop unit and several AAF unit ventilators into a network that a BAS could connect to with a single cable An OPM network can include any two or more of the following MicroTech controllers e Series 100 centrifugal chiller old style e Series 200 centrifugal chiller e Reciprocating chiller e Screw chiller e MicroTech Absorption Gateway for McQuay absorption chillers e Applied rooftop unit e Self contained air conditioning unit e Series 100 unit ventilator old style e Series 300 unit ventilator e Water source heat pump old style e MicroTech Communications Gateway for water source heat pumps with
27. ler was successful If the Error Code reads Does Not Respond a communications problem has occurred If a communications problem occurred check the following Make sure the hex switches on each controller are set to the correct values Make sure the controller has power supplied to it Make sure the communication line is properly connected to port B Make sure the controller is level 2 by directly connecting the PC to it 1 Go to the next controller and repeat steps 1 through 6 Do this for each controller being connected to the network Communications must be established between the OPM and every controller on its network before the network is turned over to the BAS personnel 2 When communications to all the unit controllers on the network have been verified the OPM s Number Of Slaves variable needs to be set back to zero This will speed up communications for the BAS See Setting Parameters in the OPM on page 17 for information on how to do this 3 At this point the PC can be disconnected from the OPM s A port and the BAS can be connected Note that some BASs use RS 485 If this is the case the Port A Select switch should be placed in the 485 position In addition to verifying network communications between the OPM and its level 2 controllers you have also verified that a PC can connect to the OPM through port A with the communications password shown on the Monitor screen The BAS should use this same
28. ments twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent 11 Figure 4 Typical Field Wiring Schematic Hot 3rd party BAS See notes 1 amp 3 ie e F B Applied rooftop series 200 Screw chiller Notes 1 Twisted shielded pair cable must meet the following Legend minimum requirements 300 V 60 C 20 AWG polyethylene Field wiring terminal insulated with a PVC outer jacket and drain wire Belden 8762 or equivalent Some local codes may require the use of plenum rated cable SENS 2 Cable length must not exceed 50 ft 15 m A ar twisted ed pacar 3 Cable length must not exceed 5000 ft 1524 m a rain wire See note 1 Field wiring discrete Factory wiring Crimp or solder splice Some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Note Ideally one continuous piece of cable should connect any two controllers This will reduce the risk of communications errors If the cable must be spliced use crimp type butt connectors better or solder best Do not use wire nuts Wiring Instructions The network connection to the OPM Panel and level 2 controllers is at port B on their MCB boards As shown in Figure 4 field wiring to port B on these controllers can be accomplished by connecting the network
29. nergized 4 Check for proper communication trunk voltages at the field wiring terminals if any or directly on the connector The trunk must not be connected to the controller when you do this If no voltage or improper voltages are found check the wiring between the port terminals and the field terminals if any Using Table 7 and Figure 9 10 or 11 verify that the three conductors are properly terminated in the network communications connector If there is still a problem verify that the level 1 controller is energized and that the communications trunk wiring is intact 5 Plug the network connector into port B 6 Verify that communications have begun between the OPM and the level 2 controller Using a PC running Open Protocol Monitor software perform a network diagnostic For information see the Performing Network Diagnostics section in the MicroTech Open Protocol Monitor Software User s Manual You can choose to continually loop the network scan to have a single network scan or to scan for a specific controller It is most convenient to use the Loop option but any method will work As the different controllers are connected to the network their information is displayed on the Network Diagnostic Error Display screen By looking at the headings labeled Address and Error Code network communications to a particular controller can be verified If there are no error codes network communications to the control
30. or details on specific parameters and capabilities ask your McQuay International representative or Open Protocol partner company representative Component Data Figure 1 shows the control panel layout for the OPM The main component of the control system 1s the Microprocessor Control Board MCB On the MCB are hex switches communication ports LEDs and a 1 5 amp fuse Power to the controller is provided by transformers T1 and T2 Circuit breaker CB1 which provides overcurrent protection can be used as an on off switch for the panel These components are mounted inside a NEMA 1 enclosure Figure 1 Micro Tech OPM Panel Layout 16 Hex switches Microprocessor Control Board The Microprocessor Control Board MCB is shown in Figure 2 It contains a microprocessor that is preprogrammed with the software required to interface other MicroTech controllers with a third party manufacturer s BAS Located on the MCB are hex switches communication ports and status LEDs Figure 2 Microprocessor Control Board MCB Hex switches Green status LED Communication Red status LED Hex Switches The MCB includes two hex hexadecimal
31. password If the BAS cannot connect using this password there is likely a problem on the BAS side not the McQuay side Table 7 Port B Voltages Port B RS 485 Phoenix AMP IDC 325 IDC 125 Signal terminal terminal terminal terminal Acceptable voltage reading 2 4 1 4 3 0 0 3 Vdc 3 3 2 5 2 0 0 3 Vdc Ground 1 5 3 6 0 0 0 2 Vdc IM 474 3 IM 474 3 Figure 9 Phoenix Connector Terminal Configuration Plug top view Socket PORTA PORT B COMMUNICATIONS FUSE BUSSMAN MCR 1 4 Figure 11 IDC Connector Terminal Configuration Bottom View 21 Service Information Wiring Diagram The following wiring diagram is identical to the one in the OPM Panel It is reproduced here for your convenience The legend is shown in Table 8 Table 8 OPM Panel Schematic Legend Component designation Description Blas Circuit breaker MCB ss Microprocessor Control Board He 2 Transformer 115 24 Vac 2 Transformer 24 Vac 18 Vac CT LB centeanianeseeeees Terminal block low voltage section Factory wire number Field wiring terminal Printed Field wiring circuit board terminal Twisted shielded pair cable Figure 12 OPM Panel Schematic HOT NEUTRAL GRD lt 115V A C POWER SUPPLY y MAX RATING OVERCURRENT PROTECTIVE DEVICE 15 AMPS L CRI
32. re 4 Power wiring must be sized to carry at least 5 amps To gain access to the high voltage section remove the deadfront barrier It is attached to the panel with two 16 inch hex screws Replace this deadfront when the wiring is complete The panel is internally protected by a 0 5 amp circuit breaker CB1 which 1s located inside the panel on the underside of the high voltage section see Figure on page 7 This push button circuit breaker can also be used as an on off switch for the panel When the push button is in the panel is energized When the push button is out the panel is de energized Note that a white ring on the switch shaft is visible when the push button is out Network Communications For network communications to occur a twisted shielded pair cable must be connected between the OPM Panel and its associated MicroTech unit or auxiliary controllers This interconnecting daisy chain wiring is shown in Figure 4 Network communications is accomplished using the RS 485 interface standard at 9600 baud For the typical Open Protocol network the OPM Panel is the level 1 controller and the unit controllers are level 2 controllers In an Open Protocol network there are no level 3 controllers except in the case of series 100 old style centrifugal chillers which have a level 2 display processor and a level 3 unit controller Cable Specification The network communications cable must meet the following minimum require
33. rotocol Master OPM Panel It describes the components field wiring options and requirements network commissioning procedures and service procedures The OPM Panel is used when integrating two or more MicroTech unit or auxiliary controllers into another company s building automation system BAS For specific information about unit or auxiliary controllers refer to the appropriate MicroTech controller installation manual see Table 1 For installation and commissioning instructions and general information on a particular unit refer to 1ts model specific installation manual Table 1 MicroTech Controller Installation Literature MicroTech unit or auxiliary controller Installation amp Maintenance Data bulletin number Series 100 centrifugal chiller IM 403 Series 200 centrifugal chiller IM 616 Reciprocating chiller IM 493 Screw chiller IM 549 Applied rooftop IM 483 Self contained air conditioning IM 608 Series 100 unit ventilator IM 509 Series 300 unit ventilator IM 613 MicroTech Loop Water Controller IM 431 MicroTech Absorption Gateway IM 620 MicroTech Communications IM 661 Gateway Notes 1 The MicroTech Absorption Gateway MAG is an interface to McQuay absorption chillers which use Sanyo controllers 2 The Microtech Communications Gateway MCG is an interface to McQuay water source heat pumps which use MicroTech 2000 controllers When there are only MicroTech 2000 controllers an MCG can substitute for an OPM Panel
34. should give a copy to the BAS engineers so they can set up the BAS software If the schedule is prepared by the BAS engineers you should obtain a copy so you can set the addresses and commission the network Note If BAS company personnel prepare the address schedule they must be aware of and follow the addressing rules which are given below The system engineer should keep in mind the following rules when preparing the address schedule e The level 1 controller usually an OPM always has a hex switch setting of 00 address 00 00 e The L2 addresses of level 2 MicroTech controllers must start at 01 and continue consecutively in hex up to the limitation of the BAS e There must be no gaps in the address sequences and no duplicate settings As long as these rules are followed a MicroTech controller s network address can be set to any value Projects With Two or More OPM Panels If a project has two or more OPMs the networks associated with them should be separate and independent The BAS will then have separate connections for each OPM Panel Each network must follow the addressing rules listed above The BAS will be able to distinguish between multiple units with the same MicroTech address as long as they are on separate MicroTech networks For example assume that a project includes 100 MicroTech equipped unit ventilators and the BAS limitation is 64 controllers Sixty four unit ventilators connect to OPM A and 36 unit ven
35. tilators connect to OPM B One possible addressing scheme is as follows IM 474 3 Hex switch setting Controller 00 OPM A 01 Unit ventilator 1 on OPM A network 02 Unit ventilator 2 on OPM A network 03 40 Unit ventilators 3 through 64 on OPM A network 00 OPM B 01 Unit ventilator 1 on OPM B network 02 Unit ventilator 2 on OPM B network 03 24 Unit ventilators 3 through 36 on OPM B network Table 6 Hexadecimal to Decimal Conversion Guide Hex Dec Hex Dec Hex Dec Hex Dec 01 1 11 17 21 33 31 49 02 2 12 18 22 34 32 50 03 3 13 19 23 35 33 51 04 4 14 20 24 36 34 52 05 5 3 21 25 37 35 53 06 6 16 22 26 38 36 54 07 7 17 23 27 39 37 55 08 8 18 24 28 40 38 56 09 9 19 25 29 41 39 57 OA 10 1A 26 2A 42 3A 58 OB 1 1B 27 2B 43 3B 59 0C 12 1C 28 2C 44 3C 60 0D 13 1D 29 2D 45 3D 61 OE 14 1E 30 2E 46 3E 62 OF 15 1F 31 2F 47 3F 63 10 16 20 32 30 48 40 64 OPM Controller Setup Tip Have the A PC equipped with Open Protocol Monitor software 1s required to set up the OPM controller The MicroTech Open dl Protocol nianie first step in doing this 1s to connect the PC to it Software User s Manual available Connecting the PC to the OPM ale AA dike me Unplug the OPM s Phoenix plug from port A if necessary and connect the PC communications procedure s cable to it If you re using the cable from the PC Communications Cable Kit connect the AMP to Phoenix adapter first see Figur
36. uctors Use an ohmmeter to test for shorts at field wiring terminal block or directly on the port B connector of the level 1 controller For the three combinations of conductor pairs there should be infinite resistance between the conductors If the conductors are properly terminated this check will test for shorts throughout the trunk If you find a resistance that is high but less than infinite it indicates that one or more non powered controllers are connected to the trunk These controllers should be located and disconnected 3 Verify that the communications wiring is continuous over the trunk and that the field terminations are correct This step is optional but recommended to do it you must know the physical layout of the network s communications trunk IM 474 3 IM 474 3 Go to the last controller on one end of the daisy chain and place a jumper across the and terminals Then go to the last controller on the other end of the daisy chain and use an ohmmeter to test for continuity across the and terminals Remove the jumper and repeat this step for the other two conductor pairs to ground and to ground If there is continuity for each conductor pair the wiring is continuous and it is likely but not guaranteed that the terminations are correct throughout the trunk If there is no continuity for one or more conductor pairs there may be a break in the trunk or
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