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MicroTech® Remote Monitoring and Sequencing Panel

1. CAUTIO REFER TO BULLETIN NO IM 498 CONCERNING GROUND LOOPS LEGEND FACTORY W CATING CHILLE CATING CHILLE LOMA DEMAND LIMITING GRounpx FOR ALL CHILLERS SEE BULLETIN NO IM 498 REMOTE STOP SWITCH AUTO 1 OR EXTERNAL TIME CLOCK SS FOR CHILLER 1 NOTE TO FIELD WHEN A REMOTE STOP SWITCH OR EXTERNAL TIME CLOCK IS CONNECTED TO ANY CHILLER THE JUMPER MJ BETWEEN TERMINALS 140 amp 141 MUST BE REMOVED o STOP REMOTE STOP SWITCH AUTH OR EXTERNAL TIME CLOCK FOR CHILLER 2 REMOTE STOP SWITCH AUTH OR EXTERNAL TIME CLOCK FOR CHILLER 3 RING FIELD WIRING TERMINAL FIELD WIRING CABLE SHI ELDED TWISTED AND JACKETED PAIR WITH DRAIN WIRE re PRINTED CIRCUIT BOARD TERMINAL 23 24 Figure 14 Field Wiring Schematic Screw Chillers 115 VOLTS AC POWER SUPPLY FUSED 15 AMPS NEUTRAL EW CHILLE INPUT A6 250 OHM HARDWARE BY OTHERS OPTIONAL MONITOR SOFTWARE OPTIONAL CABLE KIT OUTDOOR AIR TEMP SENSOR ZONE TEMP SENSOR OPTIONAL RMS SENSOR KIT UNREGULATED INTERNAL 12 VDC POWER SUPPLY FOR FIELD USE 100 MA MAX LOAD EXTERNAL CHILLED WATER RESET GROUND FOR ALL CHI
2. O D Ez Ti Los T2 LE 54 Ss eko TBI o o U U U CB1 CB es oa s TB2 Q Q SIB inti DN N Software ID tag O Microprocessor Control Board a0 The Microprocessor Control Board MCB is shown in Figure 6 It contains a microprocessor that is preprogrammed with the software required to monitor and control up to three chillers The MC coordinates all communications between the RMS controller and the chiller controllers When appropriate it enables and disables chillers as required by its schedule the current lead lag configuration and the cooling load IM 498 1 IM498 1 Figure 6 Microprocessor Control Board MCB gt HI LO lt 3 a n a ADDRESS 8 FUSE 1 gt oo a 2 eit eb 4 2 o ollo o gt o o jjo o Y 0010 06 lt 2 COMMUNICATIONS a FUSE BUSSMAN MCR 1 4 E g a RUNNING Q7 cpu RESET _ J STATUS ACTIVE JOUTPUT 0 POWER FUSES BUSSMAN GDC T2A ta 2 5 z o a z5S lo z Q 53 3 g SASI jo DIGITAL OUTPUTS v a OoO lt Ars z ol oooooooo00 lt lt AUX OUT A a0124 Analog Inputs Connection The MCB receives conditioned analog inputs from the Sensor Input Board through the Analog Inputs
3. Installation amp Maintenance Data Group Controls Part Number 571560Y 01 Date January 1998 MicroTech Remote Monitoring and Sequencing Panel Reciprocating ALR amp WHR and Air Cooled Screw ALS Chillers DP MicroTech RMS Chiller1 Enabled LE McQuay 1998 McQuay International International Contents Content o i 2 Tllustr ti0ds outra inn iba initial lets 2 EI A A TO 3 A O NN 4 Applying the RMS Panel tunienn kiretu Aa ELUS LEMSALU i el SN 5 General DescriptiON 0d dentada dad artis 9 Component Dita ninia ns iaa ls id A add ds 9 Microprocessor Control Board si isccsiesesgsbestassasepsuey lt sbedbsicasap sa and det task b ho sans LULU E IPA andku LASU ka E 10 Keypad Display Boar ici is is 13 LED Status Board usura la ta cs 14 Sensor Input Boats sorre cenie A A an i ae eens 15 Temperature Sensots sisi siisssssccsabsidasesiey Sascabsidisesssasssadlesiasvscae seedbedlagvassesssnabiabegustas pt sdbr la usta 15 Software ID io 15 Software Compatiblllt usina dois ln pisa nh tie da d o Ad 16 MicroTech Monitoring and Networking Options ooocoonccnonconconcnncononono orerrereeresneeteeteeenenesenee seeseeeeens 17 PE Monitoring ins ii diri alii rita 17 Network Master Panel a a 17 Installation aa conri rin a rr 19 Panel Location and Mounting ite ane n i E kn e a a e e nenes 19 A NO 20 POWEL hanp E N E E ER EEA E E A A E ases 21 Network Communications sean
4. S Connections to terminal 41 12 VDC power supply and terminal 46 ADI terminal G may not be required For additional information see the unit wiring diagram and IM 549 MicroTech Screw Chiller Controller External Demand Limiting Signal N CAUTION Ground loop current hazard Can cause equipment damage The external demand limiting signal must beisolated from any ground other than th MicroTech controller chassis ground If it is not ground loop currents could occur which could damage the MicroTech controller If the device or system providing the external demand limiting signal is connected to a ground other than the MicroTech controller chassis be sur that it is providing an isolated output or condition the output with a signal isolator If you want an external 4 20 mA signal can be used to provide demand limiting for all chillers included in an RMS network The external demand limiting option requires field wiring to implement As the demand limiting signal varies between 4 and 20 mA the maximum number of stages available in each chiller varies At 4 mA and below all chiller stages are available At 20 mA onl one stage is available Between 4 and 20 mA the number of available stages varies according to a step function The step function used depends on the total number of stages the chiller is equipped with For more information refer to Demand Limiting in the Chiller Plant Control Features section o
5. one controller The PC that is used most often should be connected to the level 1 controller fo better performance For example you may have one PC that you use at the building during the week and another PC that you use at home on weekends In this situation you may want to connect the on site PC to the level 1 controller and the modem for the off site PC to a level 2 controller The RMS controller s default port A communications rate is 9600 bps however it can be changed For more information see the RMS and Chiller Controller Setup section in OM 118 MicroTech Remote Monitoring and Sequencing Panel Note If a PC is connected to a level 2 controller a levell RMS Panel must be set up to poll that level 2 controller so that the PC has access to the entire network You can do this at the RMS controller s keypad display by adjusting the Total Slaves parameter which is located under menu 21 Misc Setup See the RMS and Chiller Controller Setup section in OM 118 for more information 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 cable can be spliced into t
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7. Humidity Operating 32 100 F 0 95 In storage 40 140 F 0 95 20 Figure 12 RMS Panel Dimensions 7 8 Dia knockouts 3 on left and right sides Hinge friction adjustment screw OT 1 4 Dia mounting slots 2 14 1 2 O 16 1 2 14 3 4 8 1 4 1 4 Dia 2 Ell o BA gt J 12 EE te 14 Left Side View Front View 718 Dia knockouts O 3 on top and bottom O MA gt Z 1 7 8 le 12 1 8 Bottom View Field Wiring Following are descriptions of the various field wiring requirements and options Some RMS controller features require field wiring to implement refer to the job plans and specifications All possible field wiring connections are shown in Figures 13 and 14 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 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 temperature sensor wiring if any and the network wiring should enter the low voltage section Wiring penetrations must be made only through the 7s inch knockouts provided As shown in Figures 13 and 14 a typical chiller plant has the same type of chillers in it however this is not required The RMS Panel can control a
8. Remote Monitoring and Sequencing Panel IM498 1 13 Figure 8 Keypad Display Board KDB 1 RMS Status Chiller1 Enabled CATEGORY ACTION STATUS ALARMS CLEAR DECR CONTROL SWITCH pa ENTER LED Status Board The LED Status Board LSB which includes two sets of LEDs and an alarm horn allows you to quickly determine overall chiller plant status It is shown in Figure 9 Figure 9 LED Status Board LSB UNIT SYSTEM SELECTION STATUS O rms PANEL coww O K O CHILLER 1 O CHILLER 1 ON m cHILLER 2 E CHILLER 2 ON ca cHitter 3 CHILLER 3 ON ALARM 6 Alarm horn a0125 Unit Selection Indicators Four Unit Selection LEDs clearly indicate which chiller the RMS Panel s keypad display is emulating For example if the Chiller 1 Unit Selection LED is lit the RMS Panel s keypad display acts exactly as if it were the keypad display at Chiller 1 A combination of keystrokes allow you to change controllers System Status Indicators Five System Status LEDs show the overall status of the chiller plant Communications LED The Comm O K LED is on continually when communications with all chillers is normal If the RMS detects a communication problem with an chiller the LED flashes The flashing rate depends on the number of chillers communicating For example if communications are lost with o
9. SIB terminals Refer to the panel wiring diagram Remove power from the controller Disconnect the suspect sensor s cable from the SIB field wiring terminal block and measure the resistance across the conductors Using the thermisto chart Table 11 compare this value with the measured temperature a Ifthe measured resistance and temperature match go to step 5 b Ifthe measured resistance and temperature do not match either there is a wiring problem or the sensor is defective Check the sensor circuit wiring and connections for defects 5 Reconnect the sensor cable to the SIB Restore power to the controller and measure the DC voltage across the sensor terminals on the SIB Using the thermistor chart compare this value with the measured temperature a Ifthe measured voltage and temperature do not match go to step 6 b Ifthe measured voltage and temperature match the MCB is probably defective 6 Measure the DC voltage between terminal 2 on the SIB and chassis ground It should be 5 VDC a Ifthe voltage is 5 Vdc the SIB board is probably defective b Ifthe voltage is not 5 Vdc the MCB or the MCB to SIB ribbon cable is probably defective Troubleshooting the LED Status Board The LED Status Board is connected to the MCB via a 26 conductor ribbon cable and discrete wiring for the 12 Vdc power The MCB provides power and control signal outputs for the LEDs Board Component Defective If one of the LEDs the alarm horn or t
10. a result of misapplication of a field supplied device The MCB in the chiller controller is designed to accept 0 5 Vdc analog input signals The chiller s Analog Digital Input ADI board conditions all inputs before they enter the MCB The external demand limiting signal which enters the ADI board at input A7 is conditioned with a 250 ohm resistor This on board resistor is connected between the S signal terminal and G ground terminal of input A7 Note that the G terminal is earth ground see caution above This input arrangement converts a 4 20 mA signal to a 1 5 VDC signal The maximum allowable voltage at the S terminal is 30 V If you want an unregulated 12 VDC power supply on the chiller s MCB can be used to power the demand limiting signal output device Zf this power supply is used the total external load cannot exceed 100 mA Reciprocating Chiller Refer to Figure 13 Wire the demand limiting signal to the terminals appropriate for the application In all cases connect the shield to terminal 133 ground and the varying signal to terminal 132 ADI terminal S Connections to terminal 146 12 VDC power supply and terminal 131 ADI terminal G may not be required For additional information see the unit wiring diagram and IM 493 MicroTech Reciprocating Chiller Controller Screw Chiller Refer to Figure 14 Wire the reset signal to the terminals appropriate fo the application In all cases
11. approximately 5 seconds During this period the MCB performs a self test 2 The red LED turns off and the green Running LED turns on This indicates that the microprocessor has passed the self test and is functioning properly 3 The amber Active LED remains off continually if no alarm conditions exist in the chille network If alarm conditions exist the amber LED will flash as shown in Table 4 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 of this manual which is under Service Information Tables 3 and 4 summarize the green red and amber status LED indications Table 3 Green and Red Status LED Indication Green LED State Red LED State Indication Off Off No power to MCB Off On Self test failure or power supply problem On Off MCB operating normally For longer than 5 seconds Table 4 Amber Status LED Indication Amber LED State Indication Off Normal operation On 1 2 second Off 1 2 Alarm condition second Keypad LCD Display Connection The MCB receives input commands and operating parameters from the keypad and sends requested information to the display through the Keypad LCD Display port via a plug in ribbon cable Hex Switches The MCB includes two hex hexadecimal switches that indicate the RMS controller s network address The HI and LO he
12. connect the shield to terminal 47 ground and the varying signal to terminal 48 ADI terminal S Connections to terminal 41 12 VDC power supply and terminal 49 ADI terminal G may not be required For additional information see the unit wiring diagram and IM 549 MicroTech Screw Chiller Controller Temperature Sensors The RMS controller has several standard features that require the outdoor air temperature zone temperature or both to implement Table 8 summarizes these features For more information on them see OM 118 MicroTech Remote Monitoring and Sequencing Panel Table 8 Features Requiring Temperature Inputs RMS Panel Feature Zone Temperature Outdoor Air Temperature Optimal Start e e Outdoor Air Reset e Low Ambient Lockout e Cooling degree day Totalization e IM498 1 27 With the optional MicroTech RMS Sensor Kit part number 0057186701 zone and outdoor ai temperature sensors can be connected to the RMS Panel The RMS controller can read the outdoo air temperature from any associated chiller that has an outdoor air sensor connected to it In this case the RMS Sensor Kit is required only to connect a zone sensor for optimal start control If none of the chillers associated with the RMS controller have outdoor air sensors the RMS Sensor Kit must be installed to take advantage of any of the above features The outdoor air temperature source is defined at the RMS Panel s keypad or a PC during the commissioning pro
13. defective 8 Reconnect the digital output ribbon cable to the MCB Reconnect the 12 VDC power plug to the LSB Cycle power to the controller and check the power fuses a If both fuses are intact the problem is indeterminate Obtain factory service b Ifeither fuse blows check the LSB board and the connecting ribbon cable for shorts Eithe one may be defective Figure 19 MCB Power Supply Terminals POWER FUSES BUSSMAN GDC T2A 2 ja Fuse F1 6a o gt Z O3 Fuse F2 AO O32 Fe lOO o lt OOO o pa pp po Oyo 9 18 17 6 51 4 3 2 11 AUX OUT A a0115 Troubleshooting Communications Problems If the Comm O K LED on the LSB board is flashing it indicates that a network communications problem exists An alarm message on the keypad display indicates which chiller s the RMS Panel has lost communications with Troubleshooting this type of problem is limited to the following e Checking the port B voltages e Checking the port B fuses e Checking the network wiring integrit e Checking the network addressing 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 Troubleshooting Analog Input Problems The controller receives its analog input
14. disabled As a result the RMS controller is not able to start it if additional cooling capacity is required When a chiller s remote switch is closed that chiller is enabled As a result the RMS controller is able to start it as required to meet the cooling load if it is not disabled for some other reason External Time Clock There are several methods of switching the chiller plant between occupied and unoccupied operation It can be done by the RMS Panel s internal schedule an NMP schedule assigned to the RMS Panel an operator override at the RMS Panel or an external time clock If an external time clock is used it must be wired so that a separate set of dry contacts is connected to the remote stop input of each chiller If there are not enough poles on the time clock use a relay The chiller plant is in the occupied mode when the time clock s contacts close The chiller plant is in the unoccupied mode when the time clock s contacts open For the external time clock to have absolute control ove chiller plant scheduling all internal daily schedules in the RMS and chiller controllers must be set for continuous occupied operation this is the default setting For more information see the Scheduling section of OM 118 MicroTech Remote Monitoring and Sequencing Panel Note The optimal start feature is not available if an external time clock is used for scheduling IM 498 1 IM498 1 Wiring Instructions As shown in Figu
15. keypad display assembly see Figure 5 Back Light Not Lit The Keypad Display Board supplied with the RMS Panel is equipped with a back light If the light does not come on check for 5 Vdc at terminal 1 on the J4 plug on the KDB Refer to the panel wiring diagram or Figure 19 Note that this terminal is the one closest to the ribbon cable connector To take the voltage reading pull the plug back about one eighth of an inch and place the test leads against the exposed pins If there is no voltage check the wiring and connections between the Aux Out terminal strip and the KDB If the wiring is intact the MCB is probably defective Display is Blank or Garbled If the MCB appears to be functioning properly and the display is completely blank or garbled perform the following procedure 1 Try cycling power to the controller by opening and then closing circuit breaker CB1 see note below 2 Try adjusting the contrast trim pot which is located on the back of the keypad display assembl see Figure 5 If the contrast trim pot has no effect it is likely that either the keypad display o 1ts ribbon cable is defective 3 After removing power from the controller check the ribbon cable and connections between the keypad display and the MCB Look for bent pins Restore power after reconnecting the ribbon cable 4 Try swapping a known good ribbon cable and keypad display These may come for example from a chiller controller The keypad dis
16. made in Cecchina Italy These chillers support English and other languages but the RMS panel has an English only keypad display The RMS displays all messages in English IM 498 1 IM498 1 If you want to use an RMS Panel with older chillers that have incompatible standard software the chiller software must be upgraded If you have a version of chiller software that is later than the compatible programs shown in Table 5 it is likely that this version is compatible with it however it may not be To find out for sure contact McQuayService Microtech Monitoring and Networking Options PC Monitoring A PC personal computer equipped with the appropriate Monitor software can be used to provide a high level interface with a MicroTech network see PC specification below Monitor software features a high resolution graphic display multilevel password access and advanced trend logging The PC can be connected to the RMS controller either directly via a single twisted shielded pai cable or remotely via phone lines with an optional modem For more information on connecting the PC to the controller refer to PC Connection in the Field Wiring section of this manual For the most convenience and best operation the PC should be considered dedicated to the MicroTech system However you can exit the Monitor program to perform other tasks without affecting equipment control Refer to the user s manual supplied with the Monitor softwa
17. no shorts o stray voltages anywhere in the communications trunk and 2 that port B in each controller is intact It must be performed once at every controller on the trunk before going on to the following Verifying Communications procedure You can start at any controller and proceed in any order Before beginning verify that the port B connectors are disconnected from every controller on the trunk On the RMS and chiller controllers the port B connector is an AMP plug 1 Verify that there is no voltage between any conductor and ground Use a voltmeter to test for voltage at the network communications field wiring terminal block With one lead on the control panel chassis ground check for voltage at the and ground terminals Table 9 summarizes the terminal labels for the various controllers There should be no AC or DC voltage 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 Note The first check should test for voltage throughout the entire trunk however it is important that it be done at every controller Cables look similar and can easily become crossed 2 Verify that there are no shorts between any two conductors Use an ohmmeter to test for shorts at the network communications field wiring terminal block For the three combinations of conductor pairs there should be infinite resis
18. port via a plug in ribbon cable These inputs are 0 5 Vdc analog signals Digital Outputs Connection After processing all input conditions and network data the MCB sends the appropriate output signals to the LED Status Board through the Digital Outputs port via a plug in ribbon cable Aux Out Terminal Strip The Aux Out terminal strip provides 12 Vdc power to the LED Status Board and 5 Vdc power to the back light on the Keypad Display Board Refer to the panel s wiring diagram or Figure 19 for more information Power In Terminal Strip The MCB receives 18 Vac center tapped power from transformer T2 through the Power In terminal strip This power drives all logic and communications circuitry the Aux Out terminal strip the LED Status Board and the Keypad Display Board Refer to the panel s wiring diagram or Figure 19 for more information Power Fuses Two identical 2 amp fuses are located to the right of the Power In terminal strip These fuses are in the MCB power supply circuit Microprocessor Status LEDs The green red and amber LEDs on the MCB provide information about the operating status of the microprocessor The amber LED also indicates the existence of alarm conditions in the chille network The Alarm LED on the LSB board also does this 11 Following is the normal start up sequence that the three status LEDs should follow when power is applied to the MCB 1 The red Reset LED turns on and remains on for
19. s Comm O K LED should be lit and not blinking proving that network communications exist throughout the chiller plant If the chillers have been commissioned set up the RMS and chiller controllers as desired for normal operation 37 Service Information Wiring Diagram The following wiring diagram is identical to the one in the RMS Panel It is reproduced here fo your convenience The legend is shown in Figure 18 Figure 18 RMS Panel Schematic Legend Component Designation Description CB1 Circuit Breaker KDB Keypad Display Board LSB LED Status Board MCB Microprocessor Control Board SIB Sensor Input Board Tl Transformer 115 24 VAC T2 Transformer 24 VAC 18 VAC CT TBI Terminal Block High Voltage Section TB2 Terminal Block Low Voltage Section Yll Factory Wire Number 0 Field Wiring Terminal Field Wiring E Printed Circuit Board Terminal 6 Twisted Shielded Pair Cable Figure 19 RMS Panel Schematic rt GRD L3 HARDWARE amp BY OTHERS l l l l l 1 L2 NEUTRAL p OPTIONAL SOFTWARE PACKAGE OPTIONAL CABLE KIT SS ee ee 132 929 Be WES a TO RECIP SCREW Tl y 52 A 3 Te 235 B BLK gt C
20. 118 MicroTech Remote Monitoring and Sequencing Panel For specific information about the MicroTech chiller controllers refer to the appropriate MicroTech unit controller installation manual see Table 1 For installation commissioning instructions and general information on a particula chiller refer to its model specific installation manual see Table 2 Table 1 MicroTech Unit Controller Installation Literature Chiller Type Installation amp Maintenance Data Bulletin Number Reciprocating IM 493 Screw IM 549 Table 2 Model Specific Chiller Installation Literature Chiller Model Installation amp Maintenance Data Bulletin Number ALR 40 195 Tons IM 499 WHR 40 240 Tons IM 508 ALS IM 548 N 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 th equipment being controlled N 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 IM 498 1 NOTICE This equipment generates uses and can radiate radio frequenc
21. Board However if you want to use a PC to verify network communications you can The PC must be equipped with MicroTech Monitor software Note During the network commissioning process all chillers must be temporarily shut down Plan accordingly Addressing the Controllers For network communications to occur each controller in the network must have a unique network address A controller s hex switch setting defines its network address A chiller controller s hex switch setting also defines its chiller designation which is used by the RMS controller for lead lag and sequencing control for example Chiller 1 For more on hex switch settings see Microprocessor Control Board in the Component Data section of this manual After changing a hex switch setting power to the MCB must be cycled to set the new address into memory In the RMS Panel you can do this by opening and then closing circuit breaker CB1 In the chiller controllers you can do this by opening and then closing the circuit breaker that supplies power to the MicroTech controller located near the MCB The hex switches are set differently depending on whether or not there is a Network Master Panel NMP or more than one RMS Panel in the network Following are instructions on how to set them 31 Note Ifa chiller is running you should shut it down before removing power from the chille controller Do this by placing the Circuit No 1 and Circuit No 2 switc
22. D RD RTS CTS DSR GND DCD 20 DTR CoO NI DA R oo PO a0110 Network Commissioning The purpose of network commissioning is to establish and verify communications between the RMS Panel and its associated chillers It is not to establish and verify chiller plant operation Network commissioning can be done independently of the chiller commissioning procedures however fit is done before the chillers are commissioned care should be taken to assure that the chillers do not start The following instructions describe how to do this To commission the network you must be familiar with the operation of the keypad display For information see the Getting Started portion ofOM 118 MicroTech Remote Monitoring and Sequencing Panel Before the chiller plant is allowed to operate the chillers must be commissioned in accordance with the instructions in the MicroTech unit controller installation literature and the model specific chille installation literature see Tables 1 and 2 In addition the RMS Panel and its associated chille controllers must be set up so that they work properly together This setup which can be done before or after the network is commissioned is described in OM 118 A PC is not required to commission networks that include only RMS Panel s and chiller s because communications can be verified by observing the RMS Panel s keypad display and LED Status
23. Ground loop current hazard Can cause equipment damage The external reset signal must be isolated from any ground other than the MicroTech controller chassis ground If it is not ground loop currents could occur which could damage th MicroTech controller If the device or system providing the external reset signal is connected to a ground other than the MicroTech controller chassis be sure that it is providing an isolated output or condition the output with a signal isolator For chillers included in an RMS network there are two optional chilled water temperature reset methods available outside air temperature and external 4 20 mA signal The return and ice reset methods which are available with stand alone chillers cannot be used with chillers in an RMS network Either of these methods or no reset can be selected at the RMS controller keypad or PC The external reset option requires field wiring to implement If you select the external reset option it linearly resets each chiller s leaving evaporator wate temperature setpoint as the input signal varies between 4 and 20 mA At 4 mA and below there is no reset At 20 mA the leaving evaporator water temperature setpoint is increased by the maximum amount possible this amount is keypad or PC adjustable For more on reset refer to Chilled Water Reset in the Chiller Plant Control Features section of OM 118 MicroTech Remote Monitoring and Sequencing Panel Cabl
24. HILLERS W 909 KDB 5 26 27 PORT 3 4 a GND as usv 24v 905 LE S PORTA y PORT E NE 51 BL esv lp MJ COMMUNICATIONS BK 910 e 9045 at gt SS SS SS TTT BL Tz Y yr 907 oF MCB jz aR 53 e TEMP 908 932 az 115 VOLTS AC 906 lo POWER SUPPLY 55 930 ovat 92 5 lz FUSED 15 AMPS gt gt S ZNE 931 ovac O 54 4 AUX OUT picitaL_outpuTs 287654321 TET 901 940 svoc Sat GND 942 2 g OPTIONAL RMS SENSOR KIT e 2 L gt CBI l OS AMP AG H2 T E 900 LSB tor Qu 38 IM 498 1 IM498 1 Test Procedures A listing of MicroTech related part numbers is included in the Parts List section of this manual If the MCB must be replaced refer to the MCB Replacement section of this manual Status LED Diagnostics The MCB status 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 see Table 3 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 However this can also occur in some instances if there is a power supply problem Refer to Troubleshooting Power Problems below Red and Green LEDs Off If the red and green LEDs do not turn on after power is applied
25. LLERS SEE BULLETIN NO IM 498 INPUT AZ 250 CAUTION REFER TO BULLETIN NO IM 498 CONCERNING GROUND LOOPS EW CHILLER EW CHILLE LEGEND FACTORY WIRING CABLE SHI JACKETED PAIR WITH DRAIN WIRE DEMAND LIMITING GROUND FOR ALL CHILLERS SEE BULLETIN NO IM 498 e REMOTE STOP SWITCH aura OR EXTERNAL TIME CLOCK romu ui NOTE TO FIELD WHEN A REMOTE STOP SWITCH OR EXTERNAL TIME CLOCK IS CONNECTED TO ANY CHILLER THE JUMPER MJ gt BETWEEN TERMINALS 60 amp 61 MUST BE REMOVED o STOP REMOTE STOP SWITCH AUTO A OR EXTERNAL TIME CLOCK FOR CHILLER 2 REMOTE STOP SWITCH AUTO OR EXTERNAL TIME CLOCK FOR CHILLER 3 0 FIELD WIRING TERMINAL FIELD WIRING ELDED TWISTED AND re PRINTED CIRCUIT BOARD TERMINAL IM 498 1 2 Connect the network cable in a daisy chain manner as shown in Figures 13 and 14 Use caution to assure that the correct polarity is maintained at each controller Be sure to connect each cable s shield to the controllers as shown in the figures Like the positive and negative conductors the shield ground conductor must be continuous over the trunk 3 Ifa Network Master Panel is included in the network connect its B port to the trunk in a similar fashion External Chilled Water Reset Signal N CAUTION
26. RMS Panel B in the above example you should conside setting the hex switches for RMS Panel B to 01 and the hex switches for its Chiller 2 to 02 See the RMS and Chiller Controller Setup section in OM 118 for more information Chiller Controller Setup The chiller controller setup that results by following these instructions is the minimum required fo commissioning the network Further setup is likely necessary to adapt the chiller controllers to you particular application s requirements For complete information on how to do this see the RMS and Chiller Controller Setup section in OM 118 Control Mode During this commissioning process it is recommended that the chillers be shut down by setting their control modes to Manual Unit Off At the chiller controller s keypad display the control mode is the first item under menu 13 Control Mode You can get to it quickly by pressing CONTROL After communications have been established between the RMS and chiller controllers the chille control modes can be set as desired see note below Note Until their controllers are set up properly the chillers should be manually shut down so that the RMS Panel cannot enable them 33 34 RMS Controller Setup The RMS controller setup that results by following these instructions is the minimum required fo commissioning the network Further setup is likely necessary to adapt the RMS controller to you
27. Remote Monitoring and Sequencing RMS Panel is a microprocessor based controller designed to provide sophisticated control of up to three MicroTech equipped air cooled ALR or water cooled WHR reciprocating chillers or air cooled ALS screw chillers In addition to providing remote chiller monitoring via network communications the RMS controller is capable of sequencing two or three chillers as the cooling load varies An automatic lead lag selection ensures that chiller run times are equalized A 12 key keypad and a 2 line by 16 character display give you access to the RMS controller s status information setpoints control parameters alarm messages and schedules With a special keystroke combination the RMS Panel s keypad display can emulate any chiller s keypad display The controller includes password protection to protect against unauthorized or accidental setpoint o parameter changes The RMS Panel is capable of performing all network communications required for complete stand alone chiller plant control see note below If desired it can be incorporated into a MicroTech network that includes a Network Master Panel NMP and other MicroTech controllers In eithe case an IBM compatible computer running MicroTech Monitor software can be connected to give you full screen monitoring and control capability The computer can be connected directly o remotely via telephone lines using a modem optional Note As used throughout
28. S Panels and then the level 2 chiller controllers You can connect the chiller controllers in any order however it is better to follow the daisy chain as you proceed This makes troubleshooting easier if communications problems occur For the typical network in which there is no Network Maste Panel the RMS Panel is the level 1 controller and the chillers are level 2 controllers IM 498 1 IM498 1 As a result of the previous procedure the network communications connector should be disconnected from the B port at every controller on the trunk Be sure that this is true before beginning this procedure 1 Verify that the level 1 controller has a hex switch setting of 00 See Addressing the Controllers above for more information Plug the level 1 controller s network communications AMP connector into the B port Verif that there is power to the level 1 controller and then go to the first level 2 controller Verify that the controller has the correct level 2 network address See Addressing the Controllers above for more information With the controller s B port disconnected check for proper communications trunk voltage levels Use a DC voltmeter to test for proper voltages at the network communications field wiring terminal block With one lead on the control panel chassis ground check the voltage at the lt and ground terminals see Table 9 The proper voltages are shown in Table 10 If no vo
29. ample if a modem is connected to Chiller 3 you should consider setting Chiller 3 s hex switches to 01 See the RMS and Chiller Controller Setup section in OM 118 for details Networks With an NMP If an RMS Panel is included in a network that has an NMP the NMP must be the level 1 controller In this case an RMS Panel is a level 2 controller and the chiller controllers are also level 2 controllers Since the NMP is level 1 its hex switch setting must be 00 The hex switch settings of the level 2 controllers must start at 01 and continue consecutively to a maximum of 3F decimal 63 There must be no gaps in the sequence and no duplicate settings As long as these rules are followed a level 2 controller s hex switches can be set to any value Two or more RMS Panels and multiple chillers are possible in this type of network For example assume that a MicroTech network includes an NMP an RMS Panel two scre chillers and one applied rooftop air handling unit One possible addressing scheme is as follows Hex Switch Setting Controller 00 NMP 01 RMS Panel 02 Rooftop air handling unit PC accessible only 03 Chiller 1 04 Chiller 2 IM 498 1 IM498 1 Networks With Two or More RMS Panels and No NMP If two or more RMS Panels are included in a network that does not include an NMP one of the RMS Panels must be the level 1 controller In this case the other RMS Panels are level 2 controllers and the chiller controllers
30. are also level 2 controllers The level 1 RMS Panel s hex switch setting must be 00 The hex switch settings of the level 2 controllers must start at 01 and continue consecutively to a maximum of 3F decimal 63 There must be no gaps in the sequence and no duplicate settings As long as these rules are followed a level 2 controller s hex switches can be set to any value For example assume that a MicroTech network includes two RMS Panels and four screw chillers Each RMS Panel controls and monitors two chillers One possible addressing scheme is as follows Hex Switch Setting Controller 00 RMS Panel A 01 RMS Panel B 02 Chiller 1 for RMS Panel A 03 Chiller 2 for RMS Panel A 04 Chiller 1 for RMS Panel B 05 Chiller 2 for RMS Panel B Note The only advantage to creating a network like this is to allow a PC access to all networked controllers If there is no PC each RMS Panel should be set up as a level 1 controller in a separate network as described above in The Typical Network Note If a PC or modem is connected to a level 2 controller that controller should have as low an address as possible A level 2 RMS Panel should also have as low an address as possible This improves the performance of network communications because it reduces the required value of the level 1 RMS controller s Total Slaves parameter and thus the amount of polling For example if a modem is connected to Chiller 2 for
31. ble 7 RMS Panel Environmental Specifications oooononocnnonoccnonannnnnnnn eonernnonnonncnncn conc cono nanono ceases 19 Table 8 Features Requiring Temperature Inputs oononncnncnncnonnnononcnnno eoonnonnnoncnonanonnnonnonannnon sesseeeeens 27 Table 9 Network Communications Field Wiring Terminals ooooncnicnnnncnonnnonnnn o meseeetenneeeeeneneneene ne 36 Table 10 Port B Voltages AMP Type cooncconccoccnoccnnonocaninn n seeceesecsceccneseecsasenessces ceeeesaeeeeaecaseseenees 36 TablesLl Thermistor Chain tite ee anche ad ee ee ahi ek ee a 41 McQuay MicroTech and SeasonPak are registered trademarks of McQuay International Monitor is a trademark of McQuay International Microsoft and MS DOS are registered trademarks of Microsoft Corporation Windows is a trademark of Microsoft Corporation IBM is a registered trademark of International Business Machines Corporation 1998 McQuay International All rights reserved throughout the world Introduction This manual provides information about the MicroTech Remote Monitoring and Sequencing RMS Panel for McQuay air cooled ALR and water cooled WHR reciprocating and air cooled ALS screw chillers The RMS panel cannot control water cooled PFS screw chillers It describes the components field wiring options and requirements network commissioning procedures and service procedures For operation and information on using and programming the MicroTech RMS Panel refer to OM
32. cess Cable Specification Temperature sensor cable must meet the following minimum requirements twisted shielded pai with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Belden 8762 or equivalent Note that 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 Wiring Instructions Installation and wiring instructions for the MicroTech RMS Sensor Kit are included in IM 501 This bulletin is included with the kit The sensor wiring terminations are shown on the panel wiring diagram and Figures 13 and 14 Remote Stop Switch or External Time Clock If desired a remote stop switch an external time clock or both can be wired to a digital input D13 at each chiller These two applications have different purposes but the effect is the same when the digital input circuit is open RMS Panel control is overridden and the chiller is disabled Twisted shielded cable is not required for remote stop switch or external time clock wiring but it can be used The switch or contacts used must be rated for low voltage 24 VAC and low current 11 mA Remote Stop Switch A remote stop switch or dry contacts can be used to shut down an individual chiller from a remote location A separate switch must be connected to each chiller for which remote stop capability is required When a chiller s remote switch is opened that chiller is
33. ck the wiring between the port terminals and the field terminals Using Table 10 and Figure 17 verify that the three conductors are properl terminated in the AMP plug Remove and check the two fuses above the B port If there is still a problem it is likely that the communications driver in the MCB is defective 5 Unplug the network communications connector from the B port 6 Goto the next controller and repeat steps through 5 7 After finishing the last controller do the following Verifying C ommunications procedure Table 9 Network Communications Field Wiring Terminals Network Communications Field Terminal Controller Ground RMS Panel TB2 B TB2 B TB2 GND Reciprocating Chiller TB7 138 TB7 137 TB7 139 Screw Chiller TB4 54 TB4 53 TB4 55 Table 10 Port B Voltages AMP Type Port B RS 485 Signal Terminal Acceptable Voltage Reading 4 3 0 0 3 VDC 3 2 0 0 3 VDC Ground 5 0 0 0 2 VDC Figure 17 AMP Connector Terminal Configuration FUSE 1 e ets 3 2 A 3 e H 4 PORTA PORT B COMMUNICATIONS FUSE BUSSMAN MCR 1 4 a0114 Verifying Communications This procedure verifies that proper communications have begun for each controller as it is connected to the network The procedure begins with the level 1 controller because it coordinates network communications After connecting it you should connect any level 2 RM
34. condary flow rates can be equalized if a variable speed secondary pump is used or if multiple sequenced secondary pumps are used but note that the RMS Panel cannot perform these types of secondary pump control Primary Pump Distribution Common Chiller Pump Without Isolation Valves Chiller plant configuration 4 Primary Pump Distribution Common Chiller Pump Without Isolation Valves is shown in Figure 4 The distinguishing characteristics of this configuration are 1 two or three chillers are piped in parallel 2 a common primary chilled water pump serves all chillers 3 the primary pump is also used to distribute water to the cooling loads and 4 wate always flows through each chiller regardless of whether it is on or off Figure 4 Primary Pump Distribution Common Chiller Pump Without Isolation Valves Cooling Load Chiller 1 Chiller 2 Chiller 3 a0122 In this system the temperature of the water entering the loads depends upon the number of operational chillers If all chillers are on the temperature is very close to each chiller s leaving evaporator water temperature setpoint If some chillers are on and some are off the temperature is higher than each chiller s leaving evaporator water temperature setpoint because the cooler wate leaving the active chiller s mixes with the warmer water leaving the inactive chiller s IM 498 1 General Description IM498 1 The MicroTech
35. d display with the Total Slaves item unde menu 21 Misc Setup default is 0 A level 2 RMS Panel s Total Slaves parameter should always be set to 0 IM 498 1 IM498 1 In most cases the Total Slaves parameter must be changed only if there is 1 a level 2 RMS Panel or 2 a PC connected to a level 2 controller In the typical chiller plant network which includes one RMS Panel level 1 and no PC the Total Slaves parameter should be set to 0 default If a level 2 controller needs to be polled set the Total Slaves parameter just high enough to include that controller For example assume there are nine level 2 controllers connected to a level 1 RMS Panel the controller at address 02 is another RMS Panel and the controller at address 06 has a modem connected to it In this case the Total Slaves parameter should be set to 6 Connecting the Communications Trunk Use the following two procedures to connect the RMS controller and chiller controllers to the network You must complete the first procedure before beginning the second Note that if the RMS and chiller controllers were set up as described above the chillers are disabled when the RMS controller starts communicating with them Communications Cable and Port B Check The network communications cable should have been installed in accordance with the instructions in the Field Wiring section of this manual This procedure verifies 1 that there are
36. e MCB in the chiller controller is designed to accept 0 5 Vdc analog input signals The chiller s Analog Digital Input ADI board conditions all inputs before they enter the MCB The external reset signal which enters the ADI board at input A6 is conditioned with a 250 ohm resistor This on board resistor is connected between the S signal terminal and G ground terminal of input A6 Note that the G terminal is earth ground see caution above This input arrangement converts a 4 20 mA signal toa 1 5 VDC signal The maximum allowable voltage at the S terminal is 30 V If desired an unregulated 12 VDC power supply on the chiller s MCB can be used to power the reset signal output device If this power supply is used the total external load cannot exceed 100 mA Reciprocating Chiller Refer to Figure 13 Wire the reset signal to the terminals appropriate fo the application In all cases connect the shield to terminal 133 ground and the varying signal to terminal 135 ADI terminal S Connections to terminal 146 12 VDC power supply and terminal 134 ADI terminal G may not be required For additional information see the unit wiring diagram and IM 493 MicroTech Reciprocating Chiller Controller Screw Chiller Refer to Figure 14 Wire the reset signal to the terminals appropriate fo the application In all cases connect the shield to terminal 47 ground and the varying signal to terminal 45 ADI terminal
37. e Specification The cable for the external chilled water reset signal must meet the following minimum requirements twisted shielded with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Depending on the application either two conductors Belden 8762 or equivalent or three conductors Belden 8772 or equivalent are required Note that 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 Wiring Instructions As shown in Figures 13 and 14 the external reset signal must be field wired to Chiller 1 The Chiller 1 designation is established by the network address not the physical position of the chiller in the daisy chain See Addressing the Controllers in the Network Commissioning section of this manual for more information The RMS controller is programmed to continuousl read the reset signal from Chiller 1 and pass it to the other chillers via network communications Because there are many different devices that can provide an external signal no attempt is made here to cover every possible application Instead enough information about the MicroTech controller is presented so that a compatible output device can be selected and wired properly McQuay International is not responsible for MicroTech controller damage that occurs as a result of misapplication of a field supplied device IM498 1 25 26 Th
38. f OM 118 MicroTech Remote Monitoring and Sequencing Panel Cable Specification The cable for the external demand limiting signal must meet the following minimum requirements twisted shielded with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC oute jacket Depending on the application either two conductors Belden 8762 or equivalent or three conductors Belden 8772 or equivalent are required Note that some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with powe wiring IM 498 1 Wiring Instructions As shown in Figures 13 and 14 the external demand limiting signal must be field wired to Chille 1 The Chiller 1 designation is established by the network address not the physical position of the chiller in the daisy chain See Addressing the Controllers in the Network Commissioning section of this manual for more information The RMS controller is programmed to continuousl read the demand limiting signal from Chiller 1 and pass it to the other chillers via the network Because there are many different devices that can provide an external signal no attempt is made here to cover every possible application Instead enough information about the MicroTech controller is presented so that a compatible output device can be selected and wired properly McQuay International is not responsible for MicroTech controller damage that occurs as
39. he alarm volume pot is bad the LSB board must be replaced All LEDs Out If there is power to the panel two LEDs should always be lit the Comm O K LED and one of the Unit Selection LEDs If the green status LED on the MCB is lit but no LEDs on the LSB are lit perform the following procedure 1 Check the ribbon cable and connections between the LSB and the MCB Look for bent pins 2 Check for 12 Vdc at terminal 1 on the H1 plug on the LSB Refer to the panel wiring diagram or Figure 19 To take the voltage reading pull the plug back about one eighth of an inch and place the test lead against the exposed pin Place the other lead on chassis ground a Ifthere is no voltage go to step 3 b Ifthere is 12 VDC the LSB is probably defective 3 Check the wiring and connections between the Aux Out terminal strip and the LSB If the wiring is intact the MCB is probably defective IM 498 1 IM498 1 Troubleshooting the Keypad Display Board The Keypad Display Board is connected to the MCB via a 26 conductor ribbon cable and discrete wiring for the back light The MCB provides operating voltages control signal outputs for the display and input conditioning for the keypad inputs Display is Hard to Read The clarity of the LCD display can be affected by ambient temperature Typically less contrast results with cooler temperatures If the display is difficult to read adjust the contrast trim pot which is located on the back of the
40. he kit cable see Cable Specification for Direct PC Connection below If this is done splice the conductors with crimp type butt connectors better or solde best Do not use wire nuts The maximum allowable cable length for direct connection between the PC and a controller is 50 feet If the desired length is over 50 feet the MicroTech RS 232 Cable Extension Kit is required This kit can extend the maximum allowable distance between the PC and the controller to 4000 feet The part number is 0065487001 Remote Connection A voice quality direct dial telephone line is required for remote or off site PC access to the network The phone line should be terminated with a standard RJ 11 modular phone plug A modem enables a remote or off site PC to communicate with the networked controllers via phone lines 29 30 A modem is a standard chiller option but itis not an RMS Panel option However a modem that can be field installed in the RMS Panel or any chiller is available from McQuay International The kit comes complete with a 14 400 bps modem set up for 9600 bps and a wiring harness If a remote PC connection is required it is recommended that the modem at the MicroTech controller be supplied by McQuay International Installation and wiring instructions for the MicroTech Modem Kit are included in IM 682 This bulletin is included with the kit Cable Specification for Direct PC Connection A properly terminated twisted shie
41. hes in the Pumpdown and Stop position The Typical Network The typical RMS network includes one RMS Panel and one two or three chillers It may also include other level 2 unit or auxiliary controllers that could be accessed with a PC via the network In this case the RMS controller is the level 1 controller and the chiller controllers are level 2 controllers Since the RMS Panel is level 1 its hex switch setting must be 00 The hex switch settings of the level 2 controllers must start at 01 and continue consecutively to a maximum of 3F decimal 63 There must be no gaps in the sequence and no duplicate settings As long as these rules are followed a level 2 controller s hex switches can be set to any value To keep the system simple you should consider addressing the reciprocating and screw chillers according to thei designations For example assume that a MicroTech network includes an RMS Panel two reciprocating chillers and one applied rooftop air handling unit One possible addressing scheme is as follows Hex Switch Setting Controller 00 RMS Panel 01 Chiller 1 02 Chiller 2 03 Rooftop air handling unit PC accessible only Note If a PC or modem is connected to a level 2 controller that controller should have as low an address as possible This improves the performance of network communications because it reduces the required value of the RMS controller s Total Slaves parameter and thus the amount of polling For ex
42. ield Wiring Schematic Reciprocating Chillers oooonconicnnnnnoninconncn o eomononccnnonncnncnncnnon 23 Figure 14 Field Wiring Schematic Screw Chillers oooonncninionononicnoncono ccesecneeeeceeeeecsaeeaeeeeee cesses 24 Figure 15 RS 232 Cable Pinouts for 9 Pin Serial Ports onnonicnnnicnoonnonaccnono seceseeeeesecaeeseeneseeesaeeees 30 Figure 16 RS 232 Cable Pinouts for 25 Pin Serial Ports ceseceeesecsseeecesecneeseenees 31 Figure 17 AMP Connector Terminal Configuration concnocnocnnonocanononnnnns coceseceeeeceeeeecsaeeaeeseenee censo 36 Figure 18 RMS Panel Schematic Legend oooconccnocncccocononononono seceseeecesecseesecneveeeneeseee sesseeseeneeseseaeeees 38 Figure 19 MCB Power Supply Terminals oonconcnonnncnonncnnoncnnno mermeneneneneneeneneeenesneeeen seeeesaeeneeaeeneaes 40 Tables Table 1 MicroTech Unit Controller Installation Literature ooonionnnicnnonnonacannns ceceseeeeeeecaeeeeeneseeeeaees 4 Table 2 Model Specific Chiller Installation Literature o ooocnccnnonicncnnnacancono coeeeeceeseecesseeesseeeeseenee sees 4 Table 3 Green and Red Status LED Indication ococoonccnncnonnnoccononano ceeeeeseeeeeseceeeecneeeecsaeen voeneneeeneene 12 Table 4 Amber Status LED Indication ocooocnonnncnnnnoncnnnan n tiee ag a a aa E i 12 Table 5 Program Code RMS U13B Software Compatibilit ceeeeesecseeeceeeeeeaees 16 Ta ble 6 PC SPEGIIGAON ui dai ii acaban 17 Ta
43. ishing characteristics of this configuration are 1 two or three chillers are piped in parallel 2 each chiller has its own primary chilled water pump 3 one or more secondary pumps are used to distribute water to the cooling loads and 4 the secondary circuit is hydraulically isolated from the primary circuit by a decoupler line Figure 3 Primary Secondary Pump Distribution Cooling Load Chiller 1 Chiller 2 Chiller 3 a0121 In this system the temperature of the water entering the loads depends upon the direction of flow in the decoupler line If the flow rate in the primary circuit is higher than the flow rate in the secondary circuit decoupler arrow to the left in Figure 3 the temperature will be very close to each chiller s leaving evaporator water temperature setpoint If the flow rate in the secondary circuit is higher than the flow rate in the primary circuit decoupler arrow to the right in Figure 3 the temperature will be higher than each chiller s leaving evaporator water temperature setpoint because the supply and return water mix Typically the flow rate in the secondary circuit is higher than the flow rate in the primary circuit at part load conditions for example when only one chiller is on Typically the flow rate in the primary circuit is higher than the flow rate in the secondary circuit at full load conditions fo example when all chillers are on The primary and se
44. lded pair cable is required to directly connect a PC toa 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 plug on one end and a female DB 9 or DB 25 connector on the other See Figures 15 and 16 for cable pinouts The AMP part numbers for the AMP connector shown in these figures are as follows 1 480270 0 plug and 60617 1 female pin terminals This AMP plug can be connected to an RMS controller a chille controller or any other MicroTech controller that has the same type of AMP socket The DB 9 or DB 25 connector is for connection to a 9 pin or 25 pin serial port on the PC Note that 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 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 DB 9 connector The part number of the kit is 0057186802 Figure 15 RS 232 Cable Pinouts for 9 Pin Serial Ports AMP Plug Signal Pin TD 1 2 RD 3 5 6 Female DB 9 Signal GND IM 498 1 IM498 1 Figure 16 RS 232 Cable Pinouts for 25 Pin Serial Ports AMP Plug Signal Pin Female DB 25 Signal T
45. ller 2 Chiller 3 a0119 In this system the temperature of the water entering the loads is always very close to each chiller s leaving evaporator water temperature setpoint Primary Pump Distribution Common Chiller Pump With Isolation Valves Chiller plant configuration 2 Primary Pump Distribution Common Chiller Pump With Isolation Valves is shown in Figure 2 The distinguishing characteristics of this configuration are as follows 1 two or three chillers are piped in parallel 2 a common primary chilled water pump serves all chillers 3 the primary pump is also used to distribute water to the cooling loads and 4 each chiller has its own two position isolation valve that is closed when the chiller is off Figure 2 Primary Pump Distribution Common Chiller Pump With Isolation Valves Cooling Load Chiller 1 Chiller 2 Chiller 3 a0120 In this system the temperature of the water entering the loads is always very close to each chiller s leaving evaporator water temperature setpoint Caution Significant changes in the chilled water flow rate through the evaporators can result when the chillers in this configuration are turned on and off Large flow rate changes can cause erratic chiller control IM 498 1 IM498 1 Primary Secondary Pump Distribution Chiller plant configuration 3 Primary Secondary Pump Distribution is shown in Figure 3 The distingu
46. lock battery backed Super VGA graphics capability VGA graphics capability 17 18 Preferred Configuration Minimum Configuration Super VGA monitor VGA monitor Printer Bus mouse or trackball Serial mouse or trackball 101 enhanced keyboard 101 enhanced keyboard 9600 bps modem compatible with the AT command set 1200 bps modem compatible with the AT command set optional optional MS DOS 6 2 or higher MS DOS 5 0 Microsoft Windows 3 1 or higher Microsoft Windows 3 1 MicroTech Monitor software MicroTech Monitor software If a serial pointing device is used there must be another serial port Com1 or Com2 available for connecting the PC to the MicroTech controller IM 498 1 Installation IM498 1 Panel Location and Mounting The RMS Panel is suitable for indoor use only Table 7 lists the allowable temperature and humidit ranges Locate the panel at a convenient height for operation of the keypad display and allow adequate clearance for the door swing Mount the panel to the wall with screws or bolts It weighs 40 pounds Fou 4 inch openings are provided at the corners of the panel Panel dimensions are shown in Figure 12 The RMS Panel is equipped with special door hinges that have a friction adjustment screw By adjusting this screw you can prevent the panel door from swinging open or closed unexpectedly Table 7 RMS Panel Environmental Specifications Panel State Temperature Relative
47. ltage or improper voltage levels are found verify that the level 1 RMS Panel or NMP is energized and that the communications trunk wiring is intact Verify that there is power to the MCB and then plug the network communications connecto into the B port Verify that network communications have begun Go to the RMS Panel s keypad display and select the chiller just connected If the controlle you just connected is a level 2 RMS Panel go to step 7 To do this press the SWITCH key and then quickly press the NEXT key in the Menu key group Repeat this keystroke combination as necessary to get the desired chiller The Unit Selection LED for the selected chiller illuminates The keypad display should show the chiller controller s data If communications do not exist the message Communications lost w chiller appears in the display In this case check the terminations between the B port and the field terminal block at the chiller and if no other chillers are communicating its RMS Panel If the chiller controlle just connected is associated with a level 2 RMS Panel make sure that this RMS Panel s level was changed from to 2 Note If the level 2 controller is not an RMS or chiller controller you need a PC to verif communications Refer to the user s manual provided with the Monitor software for more information Go to the next controller and repeat steps 3 through 6 After finishing the last level 2 controller each RMS Panel
48. mixture of McQuay reciprocating and scre chillers IM 498 1 IM498 1 Power N WARNING Electric shock hazard Can cause personal injury or death This eguipment must be properly grounded All protective deadfront panels must be reinstalled and secured when power wiring is complete The RMS Panel requires a 115 Vac power supply which should be connected 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 Figure 13 or 14 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 15 inch hex screws Replace this deadfront when the wiring is complete The panel is internally protected with a 0 5 amp circuit breaker CB1 which is located inside the panel on the underside of the high voltage section see Figure 5 This push button circuit breake can also be used as an on off switch for the panel When the push button is in the panel should be energized When the push button is out the panel should be 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 RMS Panel its associated chillers and any other MicroTech unit or auxiliary controllers This interco
49. n Zero then alphabetic a0127 This edition documents revision E of the standard RMS Panel software and all subsequent revisions of version 14 until otherwise indicated If your RMS Panel software has a later revision code fo example RMS U14F some of the information in this manual may apply However since only very minor software changes are considered revisions any differences should be insignificant Figure 11 Software ID Tag S McQuay oy 960 6548738 06 0 MCB part number SOFTWARE ID RMS Program code MEE Ident NO 20 21 VENDOR S N4371 VENDOR MDL 250 06 DATE CODE 6 94 7 a0128 Software Compatibility This version is not compatible with some earlier versions of standard MicroTech reciprocating and two compressor screw chiller controller software and it is not compatible with any version of standard three compressor screw chiller controller software The current software compatibility is summarized in Table 5 The wildcard character can be any character Table 5 Program Code RMS U13B Software Compatibility Chiller Type Compatible Programs Incompatible Programs Reciprocating RCP 01A None AWR 12E AWR 12D and earlier CR EM 6H CR EM 6G CR EM 1H CR EM 1G XR EM 6H XR EM 6G XR EM 1H XR EM 1G Screw SC1 01A None SC2 17D through 171 SC2 17C and earlier SC2 180 through 18C SC3 19A SC3 18C SC4 19A SC4 18C Note The RMS Panel is compatible with the current version of reciprocating chillers
50. ne chiller in a three chiller network the LED flashes one third of the time Chiller On LEDs The Chiller 1 On Chiller 2 On and Chiller 3 On LEDs indicate at a glance which chillers are currently in a cooling mode of operation If an LED is lit that chiller is operating at stage 1 or higher Alarm LED The red Alarm LED will blink whenever there is an alarm in the RMS IM 498 1 IM498 1 Panel or any of the chillers This occurs regardless of the current selection Alarm Horn If it is enabled the piezo alarm annunciator alarm horn sounds whenever an alarm occurs in the RMS Panel or any of the chillers This occurs regardless of the current unit selection To silence the alarm horn press the ALARMS key while the RMS Panel is the selected controller You can adjust the alarm horn s volume with a small pot located on the LSB board You can also set up the horn so that it sounds only when certain types of alarms occur comm loss faults or problems For more information refer to the Alarm Monitoring section of OM 118 MicroTech Remote Monitoring and Sequencing Panel Note Silencing the alarm horn does not clear an alarm To clear an alarm from the RMS Panel you must first select the chiller with the alarm and then clear it For more information refer to the Alarm Monitoring section of OM 118 Sensor Input Board The Sensor Input Board SIB is included in the optional RMS Sensor Kit par
51. nnected between Chiller 1 and Chiller 2 It is highly recommended that the installing contractor keep track of the physical order of the controllers on the daisy chained trunk This will facilitate troubleshooting any network communications problems that may occur For more on the network address see Addressing the Controllers in the Network Commissioning section of this manual Use the following procedure 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 are connected during the commissioning procedure This is a precaution to prevent stray high voltage from damaging the controllers Any voltage in excess of 12 V can damage the board s communications drivers IM 498 1 IM498 1 Figure 13 Field Wiring Schematic Reciprocating Chillers 115 VOLTS AC POWER SUPPLY FUSED 15 AMPS NEUTRAL HARDWARE BY OTHERS c OPTIONAL MONITOR SOFTWARE PKG OPTIONAL CABLE KIT UTDOOR R TEMP SENSOR ZONE TEMP SENSOR OPTIONAL S SENSOR KIT INPUT_A6 250 OHM UNREGULATED INTERNAL 12 VDC POWER SUPPLY FOR FIELD USE 100 MA MAX LOAD 9 MA EXTERNAL CHILLED WATER RESET FOR ALL CHILLERS GROUNDS SEE BULLETIN NO IM 498 INPUT A7 250
52. nnecting daisy chain wiring is shown in Figures 13 and 14 Network communications is accomplished using the RS 485 interface standard at 9600 bps The typical network configuration which is shown in Figures 13 and 14 consists of the RMS Panel and one two or three chillers Unusual applications may include other MicroTech controllers fo example a Network Master Panel Application Specific Controllers or Unit Ventilator Controllers About MicroTech Network Architecture All controllers in a MicroTech network are assigned a level level 1 level 2 or level 3 All networks must have one level 1 controller to coordinate communications Multiple level 2 controllers can be connected to the level 1 controller with a communications trunk an isolated section of the daisy chained network wiring The network wiring between all controllers shown in Figure 13 is a trunk Multiple level 3 controllers can be connected to a level 2 controller with a separate trunk The maximum allowable length of a communications trunk is 5000 feet For the typical network in which there is one RMS Panel and no Network Master Panel the RMS Panel is the level 1 controller and the chillers are level 2 controllers this is the default factory setup If a Network Master Panel is included in the network it is the level 1 controller and the RMS Panel and the chillers are level 2 controllers Unless there are many water source heat pumps or unit ventilators in
53. nt set this parameter to NA Chiller 3 Address The RMS controller needs to know the network address of Chiller 3 ifany You can set this value at the keypad display with the Chil 3 Addr item under menu 21 Misc Setup default is N A The value of this parameter must match the hex switch setting at Chiller 3 If there are one or two chillers in the chiller plant set this parameter to NA Controller Level The RMS controller needs to know whether it is a level 1 or level 2 controller You can set the controller level at the keypad display with the Level item under menu 21 Misc Setup default is level 1 To change the controller level 1 Set the hex switches as required A level 2 controller s hex switch setting cannot be 00 A level 1 controller s hex switch setting must be 00 2 At the keypad display set the Level item to 1 or 2 as required When the ENTER key is pressed the RMS controller automatically corrects its checksums and resets itself It also changes the Total Slaves parameter to 0 see below Total Slaves A level 1 RMS controller needs to know how many level 2 controllers slaves it needs to poll When a level 1 controller polls one of its level 2 slaves it actively asks the slave if it has an requests for information from other controllers The Total Slaves parameter defines this number You can set the Total Slaves parameter at the keypa
54. particular application s requirements For complete information on how to do this see the RMS and Chiller Controller Setup section in OM 118 Control Mode Set the RMS Panel s control mode to All Chillers Off This prevents chillers from being enabled as they are connected to the network At the RMS controller s keypad display the control mode is the first item under menu 12 Control Mode You can get to it quickly by pressing CONTROL After communications have been established between the RMS and chiller controllers the RMS Panel s control mode can be set as desired Number of Chillers The RMS controller needs to know how many chillers are connected to it You can set this value at the keypad display with the Chillers item under menu 21 Misc Setup default is 2 Chiller 1 Address The RMS controller needs to know the network address of Chiller 1 You can set this value at the keypad display with the Chil 1 Addr item under menu 21 Misc Setup default is 01 The value of this parameter must match the hex switch setting at Chiller 1 Chiller 2 Address The RMS controller needs to know the network address of Chiller 2 ifany You can set this value at the keypad display with the Chil 2 Addr item under menu 21 Misc Setup default is 02 The value of this parameter must match the hex switch setting at Chiller 2 If there is only one chiller in the chiller pla
55. play does not need a back light Swap these components separately to isolate the problem Remove power from the controller before disconnecting the suspect component and restore power after connecting the replacement component If the problem persists it is likely that the MCB is defective Note The keypad display and MCB must be powered up together otherwise the display is blank Therefore if the keypad display is ever disconnected from the MCB and then reconnected power to the controller must be cycled to restore the display You can cycle power to the controller b opening and then closing circuit breaker CB1 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 if a PC equipped with appropriate Monitor software is available The factory will download the proper controller software into a replacement MCB board before it is shipped if you include the RMS controller s program code with the replacement MCB part order If the program code is not provided the MCB board is shipped without software 43 44 Job specific Monitor software includes each unit and auxiliary controller s program Therefore it is possible to download the proper controller software to a replacement MCB at the building site if a PC equipped with that job s Monitor software is available In addition if the con
56. rce and the Power In plug 3 Remove power from the controller by opening circuit breaker CB1 Check the MCB powe supply input fuses F1 and F2 with an ohmmeter See Figure 20 A good fuse will have negligible resistance through it less than 2 ohms If either or both fuses are blown replace them Go to step 4 If the fuses are intact the MCB is defective 4 Reconnect the Power In plug and disconnect all other connectors on the MCB Cycle po er to the controller close and then open CB1 and check the power fuses a Ifboth fuses are intact go to step 5 b Ifeither fuse blows the MCB is defective 5 Reconnect the keypad display ribbon cable Cycle power to the controller and check the powe fuses a Ifboth fuses are intact go to step 6 b Ifeither fuse blows check the keypad display and the connecting ribbon cable for shorts Either one may be defective 39 40 6 Reconnect the analog input ribbon cable if any Cycle power to the controller and check the power fuses a If both fuses are intact go to step 7 b Ifeither fuse blows check the SIB board the connecting ribbon cable the thermistors and the field wiring for shorts Any of these may be defective 7 Reconnect the Aux Out connector plug to the MCB Disconnect the 12 Vdc power plug from the LSB Cycle power to the controller and check the power fuses a Ifboth fuses are intact go to step 8 b Ifeither fuse blows it is likely that the keypad display is
57. re fo additional information PC Specification A direct or remote connected computer can be used for monitoring RMS Panel and chille operation changing setpoints scheduling trend logging downloading software and diagnostics The PC must be an IBM or 100 true compatible Table 6 shows the preferred and minimum PC specifications Network Master Panel The MicroTech Network Master Panel NMP allows the RMS controller and its associated chillers to be incorporated into a building wide network with other MicroTech unit and auxiliary controllers In conjunction with a PC and Monitor software it gives the building operator the capability to perform advanced equipment control and monitoring from a central or remote location The following features are provided by the optional NMP e Remote unit monitoring e Advanced scheduling features e Advanced alarm management e Global operator override by unit type e Demand metering e Historical electrical data logging For further information contact your McQuay sales representative Table 6 PC Specification Preferred Configuration Minimum Configuration 486DX processor 66MHz or better 386SX processor 16 MHz 8 MB ofRAM 4 MB ofRAM 120 MB hard disk drive or better 60 MB hard disk drive 342 floppy disk drive 342 floppy disk drive Serial port 9 pin male Com1 or Com2 Serial port 9 or 25 pin male Com1 or Com2 Parallel port o Internal time clock battery backed Internal time c
58. res 13 and 14 the remote stop switch or external time clock contacts must be field wired to each chiller as required After removing the factory installed jumper connect the switch to input D13 at terminals 140 and 141 on reciprocating chillers and terminals 60 and 61 on scre chillers When the switch is closed 24 Vac is applied to input D13 enabling the chiller When the switch is open input D13 is de energized disabling the chiller If you want both a remote stop switch and an external time clock to control a chiller wire these two devices in series Caution If you are using twisted shielded cable tape back the shield and drain wire on both ends of the cable This reduces the possibility of shorts PC Connection Regardless of whether the PC is connected directly or remotely via phone lines the connection to any MicroTech controller is at port A on the MCB It is best to connect a PC to the level 1 controller because faster data transmission result however a PC can be connected to any level 2 controller that does not have level 3 controllers associated with it Either way the PC will have access to the entire network see note below In the typical application the RMS controller is level 1 the chiller controllers are level 2 and there are no level 3 controllers See Network Communications above for more on network architecture It is possible to connect two or more PCs to the network but only one PC can be connected to an
59. s from the optional Signal Input Board Following are procedures that can be used to isolate analog input problems Refer to the panel wiring diagram o Figure 19 as you proceed IM 498 1 IM498 1 Table 11 Thermistor Chart EAS E olis 66 391 2714 68 3748 2651 69 3655 2620 so 416 2106 9 251 2020 96 i914 1828 pps 1829 1775 99 1788 1750 FF pms vas FF Johns vans Open or Shorted Temperature Sensor Circuits The controller can assist in the diagnosis of temperature sensor problems by displaying eithe open or short instead of a temperature value on menu 7 of the keypad display 41 42 If menu 7 indicates a problem check the sensor circuit wiring for shorts or disconnections If the sensor circuit wiring and connections are intact the sensor is probably defective Verify this b performing the following Erroneous Temperature Readings procedure Erroneous Temperature Readings If it is suspected that the controller is operating using erroneous temperature data the following procedure can be used to check for problems 1 Remove power from the controller by opening circuit breaker CB1 Verify that the MCB to SI and MCB to KDB ribbon cable connections are proper Look for bent pins After reconnecting the ribbon cables restore power to the controller 2 Measure the temperature at the suspect sensor using an accurate thermometer 3 Determine the sensor s associated
60. sequencing parameters appropriate to the application For more information see the Sequencing Control section in OM 118 Following are descriptions of these typical chiller plant configurations and guidelines for applying the RMS Panel The McQuay chillers in these configurations can be all reciprocating all screw or a mixture of reciprocating and screw The RMS Panel may be suitable for applications other than the four listed above If your application does not match one of these four contact your McQuay sales representative for assistance Note If two or three chillers are in an RMS Panel network the RMS Panel will always sequence those chillers The RMS Panel cannot be set up for remote monitoring only Primary Pump Distribution Individual Chiller Pumps Chiller plant configuration 1 Primary Pump Distribution Individual Chiller Pumps is shown in Figure The distinguishing characteristics of this configuration are 1 two or three chillers are piped in parallel 2 each chiller has its own primary chilled water pump 3 the primary pumps are also used to distribute water to the cooling loads and 4 the system may have a bypass line and a valve that is controlled by a differential pressure controller if there is no bypass line three wa valves are typically used at the loads IM498 1 5 Figure 1 Primary Pump Distribution Individual Chiller Pumps Cooling Load Chiller 1 Chi
61. ser pe a RA aiaa GaAs Raises ola 21 External Chilled Water Reset Signali setier esien iia i o i aN e A E AE eS 25 External Demand Limiting Signalas eeni errie sechassespensbsadedeasapsaeusier Ebai EEEn Tr GRD Seas 26 Temperature Sensors iio ii rad cd db a AEE A pra tuska db E E lo est dh 27 Remote Stop Switch or External Time ClOck meets eonnonncnncnnonononanononnonannn ceseeaeeeeens 28 RI A ON 29 Network Commission ales EE 31 Addressing the Controller canada eo aT 31 Chiller Controller S tUp caian ances dee haaku sore eae KALUGA Ap ka 33 RMS Controller Setup 12040305 itsis aset tes idilio Gants R ined shee denia das Edd e adas da 34 Connecting the Communications Trunk iw seceeeeccsseceeeseceeeecneeeeee sesaeeeeeneeeesaees 35 Service Information sassi iniaiaiai harana nasa sera a 38 Wiring DIASTAMS nissan Gunn cht ah E EEA ba oa daa E 38 Test Procede sets Aes WHORE sala Reh WIA E Ae E 39 Status LED Diagnostic toi das 39 Troubleshooting Power Problems secseeseceeeseceaeecesaceseeeen seeeeaecaeesecneeseseaeeneeas 39 Troubleshooting Communications Problems 0 meresetetest veeres 40 Troubleshooting Analog Input Problems w terteeetesereereeneenesneeeeen seeeesaecaeeseeners 40 Troubleshooting the LED Status Board ei sieeteeteneneeeeoneenenneeneenee sessaeeaeeseeaeeeeens 42 Troubleshooting
62. standard The PC can be directly connected over a limited distance with a twisted shielded pair cable or it can be remotely connected via phone lines with a modem Port A can also be used to connect a licensed building automation system to the MicroTech network via Open Protocol The default communications rate is 9600 bps For more information see PC Connection in the Field Wiring section of this manual PortB Port B is for MicroTech network communications using the RS 485 interface standard A twisted shielded pair cable should be connected to port B via terminals B B and GND on terminal block TB2 The communications rate is 9600 bps For more information see Network Communications in the Field Wiring section of this manual Keypad Display Board The Keypad Display Board KDB gives you a local interface with the RMS controller and a remote interface with the chiller controllers All operating conditions system alarms control parameters and schedules can be monitored from the display If the password has been entered any adjustable parameter or schedule can be modified with the keypad Because the display is backlit the liquid crystal characters are highly visible regardless of the ambient light level You can adjust the displa contrast with a small pot located on the back of the board see Figure 5 For information on using the keypad display refer to the Getting Started portion of OM 118 MicroTech
63. t no 0057186701 It collects the zone and outdoor air temperature sensor signals converts them into 0 5 VDC signals and sends them to the MCB via a plug in ribbon cable Figure 10 Sensor Input Board SIB a0126 Temperature Sensors The RMS controller uses negative temperature coefficient thermistors for temperature sensing A thermistor chart which provides voltage to temperature and resistance to temperature conversion data Table 11 is included in the Test Procedures section of this manual Software ID MicroTech RMS controller 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 which is printed on a small label affixed to the MCB An example of this label is shown in Figure 11 The program code is also encoded in the controller s memory and is available for display on menu 21 of the keypad display or a PC equipped with Monitor software Using menu 21 or Monitor software is the most reliable way of determining the controller s program code RMS controller program codification is as follows 15 16 RMS U13B RMS Panel Universal units English and metric Version numeric Version revisio
64. tance between the conductors see Table 9 If you find a resistance that is high but less than infinite it indicates that one or more nonpowered controllers are connected to the trunk These controllers should be located and disconnected Note The first check should test for shorts throughout the entire trunk however it is important that it be done at every controller Breaks in the trunk may exist 3 Plug the network communications connector into the B port Verify that there is power to the MCB and then check for proper port B voltage levels Use a DC voltmeter to test for proper voltages at the network communications field wiring terminal block With one lead on the control panel chassis ground check the voltage at the lt and ground terminals see Table 9 The proper voltages are shown in Table 10 Note that the port B terminal labels in Table 10 are for the AMP type connectors used on the RMS and chiller controllers Figure 17 shows the terminal configuration for this AMP connector s socket which is mounted on the MCB board The terminals are labeled on both the socket and the plug but they re hard to see 35 36 For communications to occur each networked controller must have proper voltages at its port terminals When there is only one controller connected to the trunk as in this check the measured voltages are for port B on that controller If no voltage or improper voltages are found che
65. the Keypad Display Board me seceeeeecsseeeeseceeeecnessees seeaeeseeneeees 43 MCB Replacement ss 55441245 540 530 ssayagds cassie menia eaae a a liege segs eg saunas oline desea ek 43 Parts Tisti iris a A A A oth ee A oth A ee At m A 44 Illustrations Figure 1 Primary Pump Distribution Individual Chiller Pumps o oonnonicnicnicnanananono ceseeeeeseceeeenees 6 Figure 2 Primary Pump Distribution Common Chiller Pump With Isolation Valves 6 Figure 3 Primary Secondary Pump Distribution oooonocnocnocnoccnncononono oeeveneneneneeeneeneneeeneeenee seeaeeseenees 7 Figure 4 Primary Pump Distribution Common Chiller Pump Without Isolation Valves 8 Figure Control Panel Layout oda 10 Figure 6 Microprocessor Control Board MCB cccesssssscseesscnee seeesecseeeecnersecsseeeesaeente oneneeeneene 11 Figure 7 HEX Switches isis tii ad a dis wale tetas 13 IM 498 1 IM498 1 Figure 8 Keypad Display Board KDB ooooconccnccconoccnonccnconono voteenenenenneoneenennenteonenee ceaeeaeeseenesseesaeeees 14 Figure 9 LED Status Board CSB erarnan o E seseseescesectscnssonsconseense sossonssensenseeseseseseeseress 14 Figure 10 Sensor Input Board SIB ienoiisueuneter sevetensusup senetenetsebe sete ne snerencseesossvesseesensenense 15 Figure Tl Software ID Ta ie WE Abe eink ae ats 16 Figure 12 RMS Patel Dimensions cua ica bil creas sets 20 Figure 13 F
66. the network there usually are not any level 3 controllers Cable Specification The network communications cable must meet the following minimum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC oute jacket Belden 8762 or equivalent Note that 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 reduces 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 21 22 Wiring Instructions Regardless of whether the RMS controller is level 1 or level 2 the network connection to the RMS and chiller controllers is at port B on the MCBs As shown in Figures 13 and 14 field wiring to port B on these controllers can be accomplished by connecting the network cable to terminals B B and GND in the RMS Panel terminals 137 138 and 139 in each reciprocating chiller panel and terminals 53 54 and 55 in each screw chiller panel The chiller designations shown in Figures 13 and 14 Chiller 1 Chiller 2 Chiller 3 are established by the network address not the physical position of the chiller in the daisy chain The networked controllers can be wired in any order For example the RMS controller could be co
67. this manual the term chiller plant denotes the RMS Panel and its associated chillers it would not include for example a cooling tower system controlled by a MicroTech Application Specific Controller Component Data The control panel layout for the RMS Panel is shown in Figure 5 The main components of the system are the Microprocessor Control Board MCB the Keypad Display Board KDB and the LED Status Board LSB The Sensor Input Board SIB is an optional accessory that is included with the MicroTech RMS Sensor Kit It is required to connect zone and outdoor air temperature sensors to the controller All of these major components are mounted inside a standard NEMA 1 enclosure They are interconnected by ribbon cables shielded multi conductor cables or discrete wiring Power for the system is provided by transformers T1 and T2 Following are descriptions of these MicroTech components and their input and output devices 10 Figure 5 Control Panel Layout Display contrast potentiometer KDB o potentiometer LSB 7 Y Z 7 7 Z
68. 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 Vac center tapped power from transformer T2 It then distributes both 5 Vdc and 12 Vdc power to the various MicroTech components A problem that exists in any of these components can affect the MCB and thus the entire control system Power problems can be caused by a external short which can blow a fuse or 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 suppl voltages to unacceptable levels Use the following procedure to isolate the problem Note that this procedure may require two or three spare MCB fuses see parts list Refer to the panel wiring diagram or Figure 19 as you proceed 1 Verify that circuit breaker CB1 is closed 2 Remove the MCB Power In terminal strip connector and check for 9 Vac between the terminals on the plug corresponding to terminals 2 and 3 on the board see Figures 6 and 20 Then check for 9 Vac between the terminals on the plug corresponding to terminals 1 and 3 on the board Readings of 9 12 VAC are acceptable a If9 Vacis present between both sets of terminals go to step 3 b If9 Vac is not present between both sets of terminals check transformers T2 and T1 and all wiring between the 115 Vac sou
69. troller s configuration data was stored on the PC hard drive prior to the MCB failure the exact configuration data including all keypad programmable setpoints and parameters can be restored Refer to the user s manual supplied with the Monitor software for more information Parts List Component Designation MCB KDB LSB SIB TI T2 CB1 Notes Description Microprocessor Control Board Y Keypad Display Board LED Status Board Sensor Input Board Transformer 115 24 VAC Transformer 24 18 VAC Center Tapped Circuit Breaker Ribbon Cable Assembly 26 Conductor MCB to LSB Ribbon Cable Assembly 26 Conductor MCB to KDB Fuse MCB Input Power 2 Amp Bussman No GDC 2A Fuse MCB Communication Ports 0 25 Amp RMS Sensor Kit PC Communications Cable Kit RS 232 Cable Extension Kit Modem Kit Part No 654873B 06 654972B 02 664011A 01 571870A 01 606308B 01 467381B 14 350A733H01 664012B 01 654997B 05 658220A 01 658219A 01 0057186701 0057186802 0065487001 0072140601 1 Ifdesired the factory can download the correct software into the replacement MCB prior to shipment See the MCB Replacement section above for more information 2 MCB part number 654873B 06 includes a high memory chip In addition to itself this part replaces MCB boards with part numbers 654873B 01 and 654873B 03 IM 498 1 McQuay Internationa 13600 Industrial Park Boulevard P O Box 1551 Minneapolis MN 55440 USA 612
70. x switches are shown in Figure 7 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 Typically the RMS controller s hex switch setting should be 00 Refer to Addressing the Controllers in the Network Commissioning section of this manual for more information Note You can change the setting of a hex switch with a slotted blade screwdriver that has a s2 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 IM 498 1 Figure 7 Hex Switches LO right hex switch HI left hex switch 20008 Communication Ports The MCB has two communication ports port A and port B Each port has six terminals and is set up for both the RS 232C and RS 485 data transmission interface standards The male and female connectors for these ports are manufactured by AMP Therefore they are referred to as AMP plugs or AMP connectors throughout this manual Socketed fuses located next to the ports protect the communications drivers from voltage in excess of 12 V Following are brief descriptions of each port s function PortA Port A is for communications with an IBM compatible PC using the RS 232C interface
71. y 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 reasonabl 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 disclaims any liability resulting from any interference or for the correction thereof Applying the RMS Panel The RMS Panel has been designed to control the four most common chiller plant configurations which are as follows 1 Primary Pump Distribution Individual Chiller Pumps 2 Primary Pump Distribution Common Chiller Pump With Isolation Valves 3 Primary Secondary Pump Distribution 4 Primary Pump Distribution Common Chiller Pump Without Isolation Valves Typical schematic representations of these configurations are shown in Figures through 4 Although the RMS Panel can be used with any of these configurations you should be aware that with configurations 3 and 4 the temperature of the chilled water being supplied to the load may vary at part load conditions However you can minimize any adverse effects by setting the RMS Panel s

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MicroTech® Remote Monitoring and Sequencing Panel