MicroTech, Absorption Gateway (06/95) - 918K
Contents
1. NOES 1 6 2 EXTERNAL DIGITAL CINTANTS SHA 2 SJITABLE FOR SWITCHIN 24 VOLTS AL ANL LOW TURRENT APPROXIMATELY LAMA 2 USE EWO CONDUCTOR SHIR ODED WIS TEO AND wACKE TED CABLE WITH ESAIN WIRT CRELCEN KOBE OR fa IWALLNTD 4 CAC CATPLT CONSISTS CF A NMRMAL i Y DPEN STLIE STATE REAY ANT A REPL ATAR ty AME FUSE LEAD CJRRENT RATING E AYOS AT DC FNR LEAR VILTASE RATING SIE NfEIR MATION THAT IN SLEELIFD WITH StH ID STATE RELAY KIT 4 TIM OND ACK CORSET BOARDS A ONL wiTh SOLIN S ATE RELAYS ARE SEPARATE ACCLSSORIES HAL ARE ORDERED FRU 1t FACTORY AS NEEDED CHER CRE THIS UNTI MAY JR MAY NOT AVE Aiu THE IES THA ARF SHOWN CN TRIS SCHEMATIC Page 20 IM 620 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 diag nostics If the status LEDs do not operate normally as de scribed in the Component Data section of this manual see Tables 3 and 4 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 pe riod it is likely that the MCB is defective However this can also occur in some instances if there is a power supply probl2. Expansion Bus 4 Connect the positive wire of the analog output signal to the terminal of the two pin Phoenix connec tor J3 J6 5 Connect the ground wire of the analog output signal to the terminal of the two pin Phoenix connector J3 J6 6 Position the Analog Switch Selectors to correspond to the analog output signal 7 Repeat steps 1 6 for each analog output that needs connection to the MAG 8 Restore power to the panel by pressing CB1 to the ON position after completing the analog output connec tions Analog Output Device 7 Voltage Mode IM 620 Page 15 Digital Output Connection The MAG Panel provides digital output signals from the MCB s Digital Output port to the Output Board OB via a ribbon cable When the MCB commands a certain output the designated relay on the OB passes field supplied AC or DC voltage Field terminals allow the wiring from the OB to the AC or DC load see Wiring Instructions below For more information on the on solid state relays see Bulletin No IM 606 MicroTech Solid State Relay Kit or refer the Output Board section in the Component Data section in this manual Cable Specifications The cable for the digital outputs 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 D
3. Installation and McQuay Maintenance Data nternationa a Bulletin No IM 620 June 1995 Part No 585524Y 01 MicroTech Absorption Gateway for Absorption Chillers Contents LPT OCI OT ON ae cerca sawn eieneeng les 4 General Description ccc ccec cece ce eeee ee eenaeeseeeenen 5 Component Data ssns aaa Neto 5 Microprocessor Control Board eseeeseeiresrriserirrrerrer gt 6 OUTPUT BO at saaan naear eens enue eatanenetenaants 7 Input Conditioning Module Terminal Board 7 Sonware Des sods Anigestises Accecicannhdeenadiuasi A 7 ACCESSONES apai unore ae nates cece eee 8 Solid State R lay Wit eens 8 Analog Output Expansion Module c ees 8 MicroTech Monitoring and Networking Options 9 PG MONOD O srine entation 9 Network Master Pane xccecc secs sae cestescescgattinade esos Am 9 Open Protocol Master Panel cccececeeeeeeesetenererens 9 lastalla tiOn seat cadceredi E A 10 Panel Location and Mounting eseeeserererreerrreerrsrreenn nn 10 Feld V VAG eceran E E E 11 POWE T EA E E AEE 11 Network CommunicationS esereeereerr serere ecsenents 11 PO CONNGCHOM susicsspstesaioensancieetateausebunateyavaeiaeiacawetend 14 Analog Output Connection ssssssssesessreeessrrniererrrrreres 14 Digital Output Connection ssc ti eesseserrerririrrrererrssresses 16 Network Commissioning essssssssessersrrrsereeresrrsererrreeeres 16 Addressing the Cont
4. No control of the absorption chiller is performed through the MAG A MAG is needed for each absorption chiller in a net work If there is only one absorption chiller a single MAG can connect to the Open Protocol partner s integrator or stand alone as its own network This type of configuration is called the Direct Connect MAG If there are two or more absorption chillers a level controller such as a Network Master Panel MicroTech or an Open Protocol Master Panel Open Protocol is needed to read and store informa tion from the chillers This type of configuration is called the Network Connect MAG The base panel is equipped with eight AC power rated relays plus the necessary hardware to support the addition of accessories listed in Table 2 For more information on the MAG accessories see the Accessories section in this manual Table 2 MAG Accessories 7 Analog Output Expansion Module AOX 4 Adds analog outputs it Solid State Relay Kit SSR Adds digital outputs Component Data Figure 1 shows the control panel layout for the MAG The main components of the controller are the Microprocessor Control Board MCB the Output Board OB and the Input Conditioning Module ICM Terminal Board All of these major components are mounted inside a standard NEMA enclosure They are interconnected by ribbon cables Figure 1 MAG Panel Layout Vi ICM Terminal Board Boe soe a G G OQ
5. See Addressing the Controllers above for more information Push the circuit breaker CB1 button to power up the MAG controller and verify that there is power to the MCB by observing the LEDs Connect the uncased end of the CIC to the MAG con trollers field wiring terminals as follows Table 12 Direct MAG Controller C C Connection Wire Color MAG Controller Terminal Shield T1 I GND or 1b Connect an AMP type connector to the uncased end of the CIC for direct connecting to the MAG controllers port A see Figure 13 Figure 13 AMP Connector C C Connection AMP Plug Signal Pin 5 Uncased end Of CIC Shield Page 18 IM 620 Shield Ib T11 GND or Connect an AMP type connector to the uncased end of the CIC for direct connecting to the MAG controllers port A see Figure 13 Connect the CIC to the absorption chillers unit control ler display processor port Verify communications have begun between the MAG Panel and the absorption chiller unit controller Note There are two ways to verify communications between the MAG and the absorption unit controller 1 two LEDs on the unit controller display processor will cycle on and off or 2 the amber LED on the MAG controller will stay on for 1 second and go off for 1 sec ond if communications exists see Table 4 Amber Status LED Indication in the Component Data sec tion of this manual If communic
6. s e el oe g ia 7 i 5 a ee a 0 Snap Track 0 erbe eleele shielded multi conductor cables or discrete wiring Power for the system is provided by transformers T1 and T2 Following are descriptions of these MicroTech compo nents and their input and output devices 9619S ejelee ejelele elelels ee e D aaApAQTAACAOQCCOLEKLECI REEPERI HE Hi _ 2 EE mine Ed 13 13V 134 13y 2ay es O sos ae 1O Ca ca C DC DC GAD GAI GRD 81011 aio e e elela e sis al e oejele 6 9 aes Kas een a HW x T2 ta real a H IM 620 Page 5 Microprocessor Control Board The Microprocessor Control Board MCB is shown in Fig ure 2 It contains a microprocessor that is preprogrammed with the software required to monitor the data from the absorption chiller s and other equipment that is connected to the MAG such as sensors or actuators The various MCB connections and components are described below Figure 2 Microprocessor Control Board MCB Hi LO Y EXPANSION BUS FUSE 1 x Hex switches s Yy PORTA PORTB COMMUNICATIONS FUSE BUSSMAN MCR 174 A KEYPAD LCD DISPLAY DIGITAL INPUTS RUNNING CPU RESET STATUS ACTIVE OUTPUT 0 as Microprocessor status LED s POWER FUSES BUSSMAN GOC T2A Yy GND GNO DIGITAL OUTPUTS _ y 18 24 VCT ANALOG INPU
7. they are not included in the network addressing scheme Each absorption chiller unit controller is directly connected to a MAG Panel The Direct Connect MAG Network The Direct Connect MAG Network includes one MAG Panel and one absorption chiller unit controller In this case the MAG Panel is the level l controller and has a hex switch setting of 00 Since the absorption chiller contains a non MicroTech unit controller it does not have a level or a hex switch setting For example assume that a MicroTech network includes a MAG Panel and one absorption chiller The only possible addressing scheme is as follows Hex Switch Setting Controller 00 MAG Panel Note This type of network can connect directly to an other company s building automation system BAS via the MAG Panel s A or to a PC with Monitor software Connecting the Communications Trunk Use the following procedure to connect a communications trunk between a Network or Direct Connect MAG Panel and absorption chiller unit controllers Communications Cable Check The network communications cable should have been installed in accordance with the instructions in the Field Wiring section of this manual This procedure will verify that there are no shorts or stray voltages anywhere in the communications trunk Before beginning verify that the port B connectors are disconnected from every controller on the trunk and the CIC cable is disconnected from the absorption chill
8. 2F would have the HI switch set to 2 and the LO switch set to F 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 cy cled in order to enter the new setting into memory This can be done by turning the panel s power switch off and then back on Figure 3 Hex Switches HI left hex switch LO right hex switch Hex switch setting 01 shown Expansion Bus Connection The Expansion Bus connector sends output signals to the Analog Output Expansion Module see the Accessories section via a ribbon cable The output signals are used by the Analog Output Expansion Module to drive various con trol devices 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 com munications drivers from voltage in excess of 12 V Fol lowing are brief descriptions of each port s function Port A Port A is for communications with an ab
9. AOX to the analog output device and the power wiring from the external power supply to the output device Look for bent pins cable on backwards or miswires Restore power after reconnecting all cables and wires Note If the analog output signal supplied by the MAG is a voltage signal O 5 O 10 Vdc the external power supply ground must be grounded to the Micro Tech Controllers chassis ground Page 22 IM 620 3 If the problem persists try swapping a known good AOX 4 ribbon cable s analog output device or exter nal power supply Swap these components separately to isolate the problem Remove power from the control ler and analog output device before disconnecting the Suspect component and restore power after connect ing the replacement component If the problem per sists It is likely that the MCB is defective Troubleshooting Output Boards Each output on the output board consists of a solid state relay an LED 5 amp fuse and an MOV metal oxide varistor Normally when the MCB commands an output to ener gize the solid state relay contacts will close and the LED will glow The contacts of each solid state relay are in se ries with a 5 amp fuse These fuses resemble small resis tors and are located on the board adjacent to the relays they serve see Figure 19 The fuses are pressed into place They can be removed with a needle nose pliers The MOV which is located on the underside of the output board protects
10. In this cir cuit a solid state relay will behave like an electromechani cal relay If the relay is energized the relay output will be hot If the relay is de energized voltage cannot be meas ured at the relay output The circuit shown in Figure 21 is similar to a typical circuit the difference is that there is an open set of con tacts or a disconnection between the relay output and the load In this circuit a solid state relay will not behave like an electromechanical relay if the solid state relay is energized the relay output will be hot as expected However if the solid state relay is de energized the relay output will still appear to be hot This is because the relay output and the voltmeter form a continuous circuit in which the relay s resistance though high is insignificant compared to the volimeter s resistance This means that nearly all the voltage is dropped across the voltmeter Therefore the voltmeter indicates that voltage is present If a low wattage light bulb of the appropriate volt age is used instead of a voltmeter the bulb s low resistance will load the circuit enough to eliminate the false voltage indication In this situation an incandescent test lamp is a better tool than a voltmeter Page 24 I IM 620 Figure 20 Testing a Typical Relay Circuit 115VAC Output Board Neutral Figure 21 Testing a Relay Circuit with a Disconnection 115VAC Output Board Neutral MCB Replacemen
11. Network Connect MAG Note A Direct Connect MAG can be changed to a Net work Connect MAG by downloading the correct program code see Table 5 into the MCB No additional hardware is needed to change the Direct Connect MAG to the Network Connect MAG If your Direct Connect MAG needs to be changed to a Network Connect MAG contact your McQuay Service representative Figure 4 Software ID Label McQuay P N 860 454873B 50 MCB part number SOFWARE D Program code Ident EOS NO 20 21 VENDO9 N 3574 VENDOR DL 280 50 DATE COD 10 94 Table 5 Proqram Codes Direct Connect 950468 010 Network Connect 950469 010 IM 620 Page 7 Accessories The accessories of the MAG allow for additional analog Outputs and digital outputs The components that make these additional outputs possible are the Analog Output Expansion Module AOX 4 and the Solid State Relay Kit SSR See Table 6 for the installation manuals on the dif ferent Accessories Table 6 Accessory installation Manuals Accessory installation Manual Analog Output Expansion Module AOX 4 Solid State Relay Kit SSR So id State Relay Kit The Solid State Relay Kit consists of a package of eight AC power rated relays The relays plug into the 24 channel Output Board OB in the MAG If all channels of the OB are to be used three relay kits must be purchased If other types of relays are needed such as dry contact or dc power rated th
12. and auxil iary controllers In conjunction with a PC and Monitor soft ware it gives the building operator the capability to perform advanced equipment monitoring from a central or remote location For further information contact your McQuay sales representative Open Protocol Microtech Open Protocol provides an interface between the MAG Panel and the building automation system of one of many participating manufacturers With Open Protocol the building automation system can do the following e Monitor most controller setpoints parameters and alarms In an Open Protocol application that includes one MAG Panel the Microtech Open Protocol Master OPM Panel is not required because the MAG can connect directly to the BAS interface If two or more MAG Panels are included the MicroTech Open Protocol Master OPM Panel is required For further information contact your McQuay sales representative Minimum Configuration 386SX processor 16 MHz 4 MB of RAM 60 MB hard disk drive 12 floppy disk drive Serial port 9 or 25 pin male Com1 or Com2 eee ess Internal time clock batterv backed VGA graphics capability VGA monitor Serial mouse or trackball 101 enhanced keyboard 1200 baud modem compatible with the AT command set optional MS DOSE 5 0 Microsoft Windows 3 1 MicroTech Monitor for Windows software If a serial pointing device is used there must be another serial port Com1or Com2 available
13. between MAG 1 and MAG 2 It is highly rec ommended that the installing contractor keep track of the physical order of the controllers on the daisy chained trunk This will facilitate troubleshooting any network communica tions problems that may occur For more on network ad dress see Addressing the Controllers in the Network Commissioning section of this manual gt Use the following procedure to perform the Network Connect wiring 1 Before beginning verify that port A and port B plugs are disconnected from every controller on the commu nications trunk being wired These plugs will be con nected during the commissioning procedure This is a precaution to prevent stray high voltage from damaging the controllers Any voltage more than 12 V can dam age the board s communications drivers 2 Connect the network cable in a daisy chain manner as shown in Figure 7 Use caution to ensure that the cor rect polarity is maintained at each controller Be sure to connect each cable s shield to the controllers as shown in the figure The positive negative and shield ground conductor must be continuous over the trunk 3 Connect the Communications Interface Cable CIC to the absorption chiller Connect the wires from the CIC to terminals A A and GND in the MAG as shown in Figure 7 IM 620 Page 11 Figure 7 Typical Field Wiring Schematic Network Connect MAG See Note ICM Terminal Board Level 1 Con
14. for onnecting the PC to the MicroTech controller IM 620 Page 9 Panel Location and Mounting The MAG panel is suitable for indoor use only Table 8 lists Table 8 MAG Panel Envronmenia PAAA E tha allawusahlia tamnoaratiira and hiimiditu rannac I anata tha LID GQHUWANMIG LOMIVPOCIGLUID Cte PIUUILy IYOO LULL MIG panel at a convenient height and allow adequate clearance Sar ESET REE for the door swing Mount the panel to the wall with screws or bolts Four inch openings are provided at the corners of the panel The panel weighs approximately 60 Ibs 27 kg Figure 6 shows the panel dimensions The MAG 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 30 100 F mat 38 C 10 95 noncondensing In storage Q 125 F 18 52 C 10 95 noncondensing Figure 6 MAG Panel Dimensions Hinge friction adjustment screw 7 8 22 3 Dia knockouts i ye ao 7 N ee a 4 4 6 4 Dia mounting slots 2 i 1 C ic 533 22 i Rrac ty ee SOF 15 C 54 e 81 610 12 iin 305 Koi x go j Wan 229 l ii E 7 L ej i i Pey 152 San a ae j a e 3 l 76 an E Joe bi e l 1 3 4 le ig et Se SS a ale 162 gt 44 5 a ee eee eea m
15. fuses are intact go to step 9 If either fuse blows check Output Board and the connecting ribbon cable Either of these may be defec tive If there are any AOX4 boards reconnect the expan sion bus ribbon cable to the MCB otherwise go to step 10 Cycle power to the controller and check the power fuses If both fuses are intact go to step 10 If either fuse blows check the Analog Output Ex pansion Modules if any the connecting ribbon cables and the field wiring for shorts Any of these may be defective With circuit breaker CB1 open measure the resistance between field terminals DC GRD and 5 Vdc It should be greater than 20 ohms If the resistance is greater than 20 ohms go to step 11 if the controller is equipped with at least one AOX 4 board or a modem Otherwise the problem is indeter minate Obtain factory service If the resistance is less than 20 ohms it is likely that the Output Board the ICM Terminal Board or an ex ternal field supplied load is excessively loading the MCB s 5 Vdc power supply Isolate the problem by tak ing resistance measurements on each of these devices with the wiring disconnected The resistance across the power input terminals on the Output Board and should not be less than 3000 ohms When the field wiring and the OB are disconnected the resistance across the power input terminals on the ICM Terminal Board H7 1 and H7 2 should be infinite If the com ponent
16. i Aa Left Side View Front View Right Side View knockouts wees de 48 6 3 8 162 e 10 7 8 762 Numbers in parenthesis millimeters mm ee ite to 15 3 8 391 eee ea ee OB Ne 562 Bottom View gt 7 8 22 3 Dia C 7 O O O a es 4 Page 10 IM 620 Field Wiring Following are descriptions of the various field wiring re quirements and options Typical field wiring diagrams are shown in Figures 7 and 8 Wiring must comply with the National Electrical Code and all local codes and ordi nances The warranty is void if wiring is not in accordance with these instructions The panel is separated into high and low voltage sec tions The power wiring should enter the bottom knockout on the right side of the panel in the high voltage section Wiring from the Output Board should enter through one of the 7 s inch knockouts in the high voltage section Commu nications wiring wiring to the ICM Terminal Board and wiring to the AOX 4 should enter through one of the 7s inch knockouts provided in the low voltage section Note High voltage wires should not pass through the low voltage section and the low voltage wires should not pass through the high voltage section Power A WARNING Electric shock hazard Can cause personal injury or death This equipment must be properly grounded All protective deadfront panels must be reinstall
17. terminal strip and the MAG field wiring terminal strip Note The MCB Aux Out connector plug terminals displace wire insulation to make contact with the con ductor If a faulty Aux Out connections is suspected try pressing down on the wire in the terminals with a small screwdriver LED Lit Output not Energized If the LED of a suspect output is lit but the load connected to it is not energized and everything is intact between the MCB and the coil side of the relay perform the following procedure to isolate the problem 1 Verify that 24 or 120 Vac power is present at the sus pect output s screw terminal on the output board 2 Remove power from the controller by opening CB1 Pull the 5 amp fuse on the contact side of the relay and check it for continuity with an ohmmeter If the fuse is not bad reinstall it and go to step 3 If the fuse is bad replace it and inspect the load and associated wiring before restoring power Note that a fuse from an unused output can be substituted for the bad fuse 3 Remove power from the controller by opening CB1 Swap the suspect relay with a known good relay Try to choose a relay that will not affect unit operation Re store power by closing CB1 If the output load energizes the suspect relay is bad Replace the relay If the output load does not energize when LED is lit again check the load circuit wiring and components Output Energized LED not Lit If the LED of a suspect outpu
18. the solid state relay from high transient voltages MOVs are part of the output board and cannot be replaced Following are troubleshooting procedures for various symptoms of output board problems Note It should be possible to determine whether a solid state relay is defective by using these procedures However if you need more information on troubleshooting them refer to Troubleshooting Solid State relays below A WARNING Electric shock hazard Can cause severe injury or death Even when power to the panel is off solid state relay socket terminals 1 and 2 on the output board could be connected to high voltage see Fiaure 19 Avoid them Figure 19 Outout Board Relay Socket O F Fuse O 6 250V 50 60 Hz 120V 50 60 Hz Test Resistor 330 680 Ohm QO L j r m D One LED Out If one of the Output Board LEDs fails to illuminate when the MCB is commanding the associated output to energize perform the following procedure 1 Remove power from the controller by opening CB1 Swap the suspect relay with a known good relay Try to choose a relay that will not affect unit operation Re store power by closing CB1 If the LED does not light go to step 2 If the LED lights the suspect relay is defective 2 Remove power from the controller Check the ribbon cable and connections between the OB and the MCB Look for bent pins If the cable and connections are intact go to st
19. with crimp type butt connectors better or solder best Do not use wire nuts The maximum allowable cable length for direct connection between the PC and a control ler is 50 feet Cable Specification for Direct PC Connection A properly terminated twisted shielded pair cable is re quired to directly connect a PC to a MicroTech controller The cable must meet the following minimum requirements twisted shielded pair with drain wire 300 V 60 C 20 AWG polyethylene insulated with a PVC outer jacket Beiden 8762 or equivalent It must also be properly terminated to an AMP plug on one end and a female DB9 or DB25 con nector on the other See Figures 9 and 10 for cable pinouts The DB9 or DB25 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 the above specification is provided with the PC Communications Cable Kit This cable has a DB9 connector Figure 10 RS 232 Cable Pinouts for 25 Pin Serial Ports AMP Connector AMP Plug Female DB 25 Signal Pin TD 1 2 z 2 White 3 7 RD RD 3 i es 4 RTS GND TT L 5 CTS smal Shield on 7 GND 8 DCD N e O g tf Wt A CAUTION Ground loop current hazard Can cause equipment damage a4 LE oe The analog output signals vol rage m
20. 7 7 Check the voltages of port B directly on the AMP con nector The trunk must not be connected to the control ler when you do this Use a DC voltmeter to test for proper voltages With the ground lead on the control panel chassis ground check the voltage at the and ground terminals Refer to Table 9 for the correct voltage levels If no voltage or improper voltage levels are found verify that the controller is energized 8 Check for proper communication trunk voltages at the field wiring terminals if any or directly on the connec tor The trunk must not be connected to the controller when you do this If no voltage or improper voltages are found check the wiring between the port terminals and the field ter minals if any Using Table 9 and Figure 12 verify that the three conductors are properly terminated in the network communications connector If there is still a problem verify that the level controller is energized and that the communications trunk wiring is intact 9 Plug the network connector into port B 10 Verify that network communications have begun Note If the level l controller is a NMP or OPM Panel you need a PC to verify communications Refer to the user s manual provided with the Monitor software for more information Absorption Chiller Unit Controller Connection In order for the MAG Panel to communicate with the ab sorption chiller a communications interface cable
21. CIC is connected between the MAG and the absorption chiller unit controller 1 Connect the uncased end of the CIC to the MAG con trollers field wiring terminals as follows Table 11 Network MAG Controller CIC Connection Wire Color MAG Controller Terminal T1 A Connect the CIC to the absorption chillers unit control ler display processor port Verify communications have begun between the MAG Panel and the absorption chiller unit controller Note There are two ways to verify communications between the MAG and the absorption unit controller 1 two LEDs on the unit controller display processor will cycle on and off or 2 the amber LED on the MAG controller will stay on for 1 second and go off for 1 sec ond if communications exists see Table 4 Amber Status LED Indication in the Component Data sec tion of this manual If communications does not exist between the MAG and the absorption chiller unit controller check the following e Check the CIC wiring e Check the field wiring to the MAG Panel or connec tion to port A if an AMP connector was used e Check to see if the MAG Panel and the absorption chiller unit controller are energized Direct Connect MAG Controller Connection The Direct Connect MAG is a level l controller that con nects directly to the absorption chiller unit controller via a communications interface cable CIC ds Set the network address of the MAG controller to 00 level 1
22. TS aee a a u D SEED AC AC Digital Outputs Connection After processing all input conditions and network data the MCB sends the appropriate output signals to output devices through the Digital Outputs port via a plug in ribbon cable Aux Out Terminal Strip The Aux Out terminal strip provides 5 Vdc and 13 Vdc to the MAG field wiring terminal strip The 5 Vdc is used to power auxiliary equipment The 13 Vdc can be used to power an Analog Output Expansion Module see the Accessories section of this manual for more information on the Analog Output Expansion Module Power In Connector The MCB receives 18 Vac center tapped power from transformer T2 through the Power In connector This power drives all logic and communications circuitry and the Aux Out terminal strip Refer to the panel s wiring diagram or Figure 15 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 Page 6 IM 620 Microprocessor Status LEDs The green red and amber LEDs on the MCB provide in formation about the operating status of the microprocessor The amber LED also indicates the existence of alarm conditions 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 approximately 5 second
23. at are knowledgeable in the operation of the equipment being controlled Static sensitive components A static discharge while handling electronic circuit boards can cause damage to the components Discharge any static electrical charge by touching the bare metal inside the control panel before performing any service work Never unplug any cables circuit board terminal blocks or power plugs while power is applied to the panel NOTICE This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with this instruction manual may cause interference to radio communications It has been tested and found to comply with the limits for a Class A digital device pursuant to part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment Operation of this equipment in a residential area is likely to cause harmful interference in which case the users will be required to correct the interference at their own expense McQuay International disclaims any liability resulting from any interference or for the correction thereof Page 4 IM 620 General Description The MicroTech Absorption Gateway MAG is a microproc essor based controller used as a read only interface be tween a Microlech absorption chiller and a Microlech or Open Protocol partner s building automation system BAS
24. ations does not exist between the MAG and absorption chiller controller check the following e Check the CIC wiring Check the field wiring to the MAG Panel or connec tion to port A if an AMP connector was used Check to see if the MAG Panel and the absorption chiller unit controller are energized Service Information Wiring Diagrams The following wiring diagram is identical to the one in the Figure 14 Network Connect MA Network Connect MAG It is reproduced here for your con aana venience The legend is shown in Figure 14 Component Geet Designation Description EE nese wees Circuit Breaker a ee Microprocessor Control Board EE pluGeadenudacuvidl Output Board Bande Auxiliary Output Expansion Board y EESE Transformer 115 24 Vac nia hades Transformer 24 Vac 18 Vac CT Factory Wire Number Field Wiring Terminal Field Wiring Printed Circuit Board Terminal Twisted Shielded Pair Cable Figure 15 Network Connect MAG Schematic To Port B of the Level 1 Controller OPM or NMP To Line input on Absorption Chiller Unit Controller Ji arena t EFE g NEIES ew PEU RNA Sieti GESTAL 5 tes STAI Eb hwe hoN c4 y f Ew taR Ni CAC ZIMA p Y i e a SP AE a L E E Sy Mae ek ORE JKT LD LART Wd CR ALN wx CHE HEN Nile ves HR CEVA Ho Aber
25. but recommended to do it you must know the physical layout of the network s communications trunk Go to the last controller on one end of the daisy chain and place a jumper across the and termi nals Then go to the last controller on the other end of the daisy chain and use an ohmmeter to test for conti nuity across the and terminals Remove the jumper and repeat this step for the other two conductor pairs to ground and to ground If there is continuity for each conductor pair the wir ing is continuous and it is likely but not guaranteed that the terminations are correct throughout the trunk If there is no continuity for one or more conductor pairs there may be a break in the trunk or the termi nations at one Or more controllers may have been mixed up Table 9 Port B Voltaaes AMP Type Connector Terminal oe Accep able ding i 3 0 0 3 Vde ev ee Re ee es Y Network Comm Field Controller MAC Panel OPM Pane Network Master Panel TB2 B TBo B TB2 GND TB3 B TB3 B TB3 GND Figure 12 AMP Connector Terminal Configuration PORT A COMMUNICATIONS FUSE BUSSMAN MCR 1 4 PORT B Network MAG Controller Connection In order for the NMP OPM or other level l controller in a network to connect and communicate with level 2 control lers the level l controller is connected first 1 Set the network address
26. ct MAG Controller CIC Connection saes 18 IM 620 Page 3 Introduction This manual provides information about the MicroTech MicroTech Absorption Gateway MAG It describes the components field wiring and service procedures The MAG is an interface between the absorption chiller s and a MicroTech or Open Protocol building automation system BAS The MAG allows the BAS to read data from the absorption chiller but does not allow the control of the chiller See Table 1 for the items that can be read from the ab sorption chiller through the MAG Table 1 Read Only Data i AA Chilled water inlet outlet temperature Absorbent solution pumps Hot water inlet outlet temperatures Refrigerant pump Low high temperature generator Ignition signal temperature Heating cooling simultaneous r easy ae Cooling water inlet outlet temperature and abnormality indicators Condensation temperature SVRP and SVRU valves Cooling mainfheating main eon Exhaust gas temperature steam Alarme condensate temperature Fuel control valves 1 and 2 position Digi Start stop of pumps and blowers Steam control valve output signal Combustion signal Remote Start stop signals er Inverter Output Signal 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 th
27. e MAG as shown in Figure 8 3 Integrator 0 B B GND ICM Terminal i si Be ae ice cea Board 4 KA I Y A A GND 4 E i ES Ss ee Direct Connect MAG Folol Folol ma oBo lolo OoRol lofo SKS Hot MCB LO Neutral Communications Interface Cable yoo on Absorption Chiller Unit Controller Legend Factory Wiring Field Wiring Terminal Field Wiring Cable Shielded Twisted and Jacketed Pair with Drain Wir IM 620 Page 13 PC Connection The PC is connected to any MicroTech controller at port A on the MCB It is best to connect a PC to a level 1 controller because faster data transmission will 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 NMP is a level 1 the MAG and other controllers are level 2 See Network Communi cations above for more on network architecture Note If a Dl Wote If a PC is connected to a level 2 controller a level 1 controller must be set up to poll that level 2 controller so that the PC will have access to the entire network For in formation on how to set up the level 1 controller to poll the level 2 controller see the operation manual for the par am atent ilar lar ha act ticulat coniro
28. ed and secured when power wiring is complete The MAG requires a 115 Vac power supply The supply connects to terminals L1 and L2 in the high voltage section of the panel The panel must be properly grounded by con necting the ground lug GRD to earth ground Refer to Figures 7 and 8 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 five e inch hex screws Replace this deadfront when the wiring is complete Network Communications For network communications to occur a twisted shielded pair cable must be connected between the MAG and its associated MicroTech unit or network controllers This inter connecting daisy chain wiring is shown in Figures 7 and 8 Network communications is accomplished using the RS 485 interface standard at 9600 baud 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 l controller to coordinate communications Mul tiple level 2 controllers connect to the level l controller with a communications trunk an isolated section of the daisy chained network wiring In Figures 7 and 8 the network wiring between all controllers 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 com municat
29. em 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 to the controller there is likely a defective compo nent or a problem in the controller s power distribution cir cuits 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 13 Vdc power to 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 an external short which can blow a fuse or a defective component which can either blow a fuse or cre ate an excessive load on the power supply An excessive load can lower the power supply voltages to unacceptable levels Use the following procedure to isolate the problem note that this procedure may require two or three spare MCB fuses see parts list Refer to the panel wiring dia gram or Figures 15 and 17 as you proceed 1 Verify that circuit breaker CB1 is closed 2 Remove the MCB Power In connector and check for 9 Vac between the terminals on the plug corresponding to terminals 2 and 3 on the board see Figures 2 and 18 Then check for 9 Vac between the terminals on the plug corresponding to terminals 1 and 3 on the board Readings of 9 2 Vac are acceptable If 9 Vac is present between both sets o
30. ep 3 3 Remove the relay from the suspect socket Install a 330 680 ohm resistor between terminals 3 and 5 as shown in Figure 19 Restore power by pressing CB1 to the ON position The LED should light regardless of the controller s command If the output LED illuminates it is likely that the MCB is defective If the output LED does not illuminate the output board is defective All LEDs Out If the MCB is commanding at least two outputs to energize and none of the Output Board LEDs are lit perform the following procedure 1 Verify that 5 Vdc is present at the Output Board s power terminals If 5 Vdc is not present go to step 2 If 5 Vdc is present check the ribbon cable and con nections between the output board and MCB Look for bent pins If the cable and connections are intact the Output Board or the MCB is defective 2 Remove power from the controller by placing CB1 to the OFF position Disconnect at least one wire from the power input terminals of the Output Board The resis tance should not be less than 3000 ohms If the resistance is greater than the acceptable value go to step 3 If the resistance is less than the acceptable value the Output Board is defective 3 Check the discrete wiring and connections between the following Input Conditioning Module Terminal Board T10 and OB input power field wiring terminals MAG field wiring terminal strip and Input Conditioning Mod ule Terminal Board H7 Aux Out
31. epending 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 rate cable Do not install the cable in the same conduit with power wiring Wiring Instructions The following wiring instructions explain how to connect a digital output to the MAG Panel gt Use the following procedure to connect a digital output to the MAG Panel 1 Remove power from the panel by pressing CB1 to the OFF position 2 Connect a wire from screw terminal 1 on the Output Board to the digital output device 3 Connect a wire from screw terminal 2 on the Output Board to the digital output device 4 Repeat steps l 3 for each digital output that needs connection to the MAG 5 Restore power to the panel by pressing CB1 to the ON position Network Commissioning The purpose of network commissioning is to establish and verify communications between a Microlech controller MAG Panel s and absorption chillers It is not to establish and verify unit operation Addressing the Con trollers 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 For more on hex switch settings see Microprocessor Control Board in the Component Data section of this manual The Network Connect MAG Netwo
32. er unit controller 1 Verify that there is no voltage between any conductor and ground Use a voltmeter to test for voltage at the field wiring terminal block or directly on the port B connector of the level controller With one lead on the control panel chassis ground check for voltage at the and ground terminals There should be no AC or DC volt age see the Signal and Terminal columns of Table 9 If the conductors are properly terminated this check will test for stray voltage throughout the trunk Note If you get a 2 or 3 Vdc reading it indicates that one or more powered controllers are connected to the trunk These controllers should be located and disconnected 2 Verify that there are no shorts between any two conductors Use an ohmmeter to test for shorts at field wiring terminal block or directly on the port B connector of the level controller For the three combinations of con ductor pairs there should be infinite resistance be tween the conductors If the conductors are properly terminated this check will test for shorts throughout the trunk Note If you find a resistance that is high but less than infinite it indicates that one or more non powered controllers are connected to the trunk These control lers should be located and disconnected 3 Verify that the communications wiring is continuous over the trunk and that the field terminations are cor rect This step is optional
33. ey can be ordered as individual units For more information on the Solid State Relay Kit see Bulletin No IM 606 Page 8 IM 620 Analog Output Expansion Module The Analog Output Expansion Module AOX 4 provides variable voltage or current control signals from the MAG in order to drive various control devices The AOX4 is in serted into the snap track of the MAG Only one AOX 4 board can be ordered providing a maximum of four output channels Jumpers on the AOX 4 allow the user to config ure the output ports to one of the following current voltage selections O 5 Vdc e O 10 Vdc e O 5 mA e O 20 mA For more information on the Analoa Output Exoansion Module see Bulletin No IM 607 Figure 5 Analog Output Expansion Module AOX 4 Address Switch o 2 E So ede oe dhe fee ace FF S T ve 7 aa Ess oe zai ale POWER 26 pin Expansion OK BAD Bus connector Cae Power LEDs I __ 26 pin Expansion p 7 Analog Switch y Oy Bus Connector Selectors aa a N J D i sl el i CO Cc AC DCG Power Connector a Analog Output Ports 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 inter face with a MicroTech network see PC specification below Monitor software features a DOS based display multilevel pas
34. f terminals go to step 3 If 9 Vac is not present between both sets of termi nals check transformers T2 and 11 and all wiring be tween the 115 Vac source and the Power In plug 3 Remove power from the controller by opening circuit breaker CB1 Check the MCB power supply input fuses F1 and F2 with an ohmmeter See Figure 18 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 power to the controller close and then open CB1 and check the power fuses If both fuses are intact go to step 5 If either fuse blows the MCB is defective Reconnect the analog input ribbon cable Cycle power to the controller and check the power fuses If both fuses are intact go to step 7 If either fuse blows check the ICM Terminal Board the connecting ribbon cable and the field wiring for shorts Any of these may be defective Reconnect the digital input ribbon cable Cycle power to the controller and check the power fuses If both fuses are intact go to step 8 If either fuse blows check the ICM Terminal Board the connecting ribbon cable and the field wiring for shorts Any of these may be defective Reconnect the digital output ribbon cable to the MCB Cycle power to the controller and check the power fuses If both
35. he resistance does not rise above 5000 ohms the modem or the AOX 4 board just connected is de fective With the power plug disconnected the resis tance across an AOX 4 board s DC and Q terminals should not be less than 3 million ohms Figure 18 MCB Power Supply Terminals POWER FUSES BUSSMAN GDC T2Al a So WSs Fuse Ft ee Fuse F2 Aar Q lt ES W if ir soap ti l eae 24k E ae 9 8li7 6i5 4 3 AUX OUT A ie 12114 l Ji Troubleshooting Analog Outputs Variable voltage or current control signals are sent to ana log outputs by the MCB through the Analog Output Expan sion Module AOX 4 The MCB sends a voltage or current signal to the AOX 4 via a ribbon cable Jumpers on the AOX 4 determine what type of output will be sent to the analog output device The analog output signals are sent from the AOX 4 by connecting a two pin Phoenix connector to the Analog Output Ports on the AOX 4 The analog out put device also has an external power supply usually 24 Vac that is not powered by the MAG Analog Output Device is not Operating Correctly If the MCB appears to be functioning properly and the analog output device is not operating correctly perform the following procedure 1 Try cycling power to the controller by opening and then closing circuit breaker CB1 2 Check the ribbon cable s power wiring from MAG to the AOX 4 field wiring connections from the
36. ing Schematic Direct Connect MAG ccccccccccee sees eseeeceeesceeeeeanes 13 9 RS 232 Cable Pinouts for 9 Pin Serial Ports AMP CONNGCION iescccisseineatinnlarierevee eaemiunndaai cs 14 10 RS 232 Cable Pinouts for 25 Pin Serial Ports AMP Connector cccececececececccceeseeesauasaeenenes 14 11 Analog Output Field Wiring Connection 15 12 AMP Connector Terminal Configuration 0 17 13 AMP Connector CIC Connection eccere 18 14 Network Connect MAG Schematic Legend 19 15 Network Connect MAG Schematic 00 c cece 19 16 Direct Connect MAG Schematic Legend 000 20 17 Direct Connect MAG Schematic 20 18 MCB Power Supply Terminals nn 22 19 Output Board Relay Socket 22 20 Testing a Typical Relay Circuit cece ee rene 24 21 Testing a Relay Circuit with a Disconnection 24 Tables Te Read Only Data eona N 4 2 MAG Accessories 0 cccsccccevereescssseesecasasesnaenevenes 5 3 Green and Red Status LED Indication 6 4 Amber Status LED Indication 6 5 Frogram COUS snra SN 7 6 Accessory Installation Manuals csn 8 Lx PG Sp ecificalonS aana e a E AN 9 8 MAG Panel Environmental Specifications 10 9 Port B Voltages AMP Type Connector 00000 17 10 Network Communications Field Wiring Terminals 17 11 Network MAG Controller CIC Connection 18 12 Dire
37. ion Ports 0 25 Amp PC Communications Cable Kit RS 232 Cable Extension Kit Ribbon Cable Assembly MCB to Output Board Ribbon Cable Assembly MCB to ICM Terminal Board Analog Input 733758B 02 Ribbon Cable Assembly MCB to ICM Terminal Board Digital Input 733758B 01 Ribbon Cable Assembly 9 MCB to AOX 4 Ribbon Cable Assembly 3 AOX 4 to AOX 4 Communications Interface Cable 50 Analog Output Expansion Module Solid State Relay Kit Solid State Relay AC Solid State Relay DC e Eel CIC AOX 4 S ea D Dry Contact Relay 0049265603 Notes 1 If desired the factory can download the correct software into the replacement MCB prior to shipment See the MCB Replacement section above for more information Page 26 IM 620
38. ions trunk is 5000 feet 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 outer jacket Belden 8762 or equivalent Some local codes or applications may require the use of plenum rated cable Do not install the cable in the same conduit with power wiring Note Ideally one continuous piece of cable should connect any two controllers This will reduce the risk of communications errors If the cable must be spliced use crimp type butt connectors good or solder best Do not use wire nuts Wiring Instructions Network Connect MAG The network connection to the Network Connect MAG is at port B on the MCB Microprocessor Control Board As shown in Figure 7 field wiring to port B can be ac complished by connecting the network cable from terminals B B and GND in the NMP or OPM Panel to terminals B B and GND on the MAG Field wiring connection to port A can be accomplished by connecting the Communications Interface Cable CIC from the chiller to terminals A A and GND in the MAG see Figure 7 Note that the unit designations Network Connect MAG 1 and Network Connect MAG 2 are established by the network address not the physical position of the unit in the daisy chain The networked controllers can be wired in any order For example the NMP or OPM controller could be connected
39. ipl Ti a eG Ea BS SPIT STAT ow AP ANG A Beo AAR Et AMi Fahy JAR CLESEN WAC ENG AM RA GAIE TAD VOI CAGE A MATIEN CERT OTN Nobb te troy hh AY W A IDM ARI TATIKT del tie AE Wich SIL Es STAT BI AYS ARE ALE ar AL iv ieee rom i ARESU C THA k Tm ii h 4 Bas ADL RY ML NEE VAY Gh vA ETD oA ANI HWN iN Pais t herd IM 620 Page 19 The following wiring diagram is identical to the one in the Figure 16 Direct Connect MAG Schematic Legend Direct Connect MAG It is reproduced here for your conven EAEE T eran Rennes ience The legend is shown in Figure 16 Circuit Breaker Microprocessor Control Board Output Board Auxiliary Output Expansion Board Transformer 115 24 Vac Transformer 24 Vac 18 Vac CT Factory Wire Number Field Wiring Terminal Field Wiring Printed Circuit Board Terminal Twisted Shielded Pair Cable Figure 17 Direct Connect MAG Schematic ANAL DG INPUT SIGNAL i SWITCH CONFIGURATION gi i E 3 4 cN ea a ig m H K TE THERMISTOR Tv iav d PIMA NOCTIS 1 DISCONNECT PANT PITWwE 3 BEF IRE SERVICING INFLT CONDITIONING MODSLE To Line input on Absorption Chiller Unit Controller To BAS integrator or Personal Computer tw UR PROPER INDJ SAINI TICNENS CNL SNE SwiTCh MAY RI OIN Taf IN POSTON VUMMIUNFCATILN ERM TM TURM INA BARD
40. is adequate 2 Remove power from the controller by opening CB1 Swap the suspect relay with a known good relay Try to choose a relay that will not affect unit operation Re store power by closing CB1 If the chatter does not stop go to step 3 If the chatter stops the suspect relay is defective Replace the relay 3 Remove power from the controller by opening CB1 Try to improve the connections in the Aux Out plug insula tion displacement terminals by pressing down on the wires with a small screwdriver 4 Check all other wiring and connectors for bent pins or miswires If the chatter does not stop the electromechanical relay or contactor is probably defective IM 620 Page 23 Troubleshooting Solid State Relays As shown on the unit wiring diagrams the solid state relays on the Output Boards all have normally open contacts Actually these contacts do not exist as they do in an elec tromechanical relay Instead of using contacts to switch the load the solid state relay changes its resistance from low closed when it is energized to high open when it is de energized This high resistance is approximately 100K ohms Because the output circuit through the solid state relay remains continuous regardless of whether the relay is energized troubleshooting a solid state relay with a voltme ter can be tricky In a typical circuit a power source is connected across a single relay output and a load see Figure 20
41. ngs e 120V 50 60 Hz e 250V 50 60 Hz Input Conditioning Module Terminal Board The Input Conditioning Module ICM Terminal is provided for possible future applications The ICM Terminal Board has three edge card connectors field wiring terminals for analog and digital inputs field wiring terminals for 5 Vdc and 24 Vac field wiring terminals for communication ports and ribbon cable connections to the MCB Power Above each edge card connector are field wiring terminals for 5 Vdc regulated and 24 Vac ground referenced These terminals can be used to power peripheral devices It is also used to power the LEDs in the Output Board Communications Also located on the ICM Terminal Board are communica tions field wiring terminals Terminals B B and GND connect to either a level l controller s communications field wiring terminals or to the absorption chiller Terminals A A and GND connect to the BAS integrator the absorption chiller or a PC Both sets of terminals have an AMP con nector that attach to the MCB port A and port B Software ID MicroTech software is factory installed and tested in each panel prior to shipment The software is identified by a program code also referred to as the Ident The program code is encoded in the controllers memory and is available for display by using a PC equipped with Monitor software The MAG has standard software written specifically for the Direct Connect MAG and the
42. ode must be iso lated from any ground other than the MicroTech control ler chassis ground If it is not ground loop currents could occur which could damage the MicroTech controller Cable Specifications The cable for the analog outputs 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 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 rate cable Do not install the cable in the same conduit with power wiring Wiring Instructions The following wiring instructions explain how to connect a analog output to the MAG Panel gt Use the following procedure to connect an analog output to the MAG Panel 1 Remove power from the panel by pressing CB1 to the OFF position 2 Connect a power wire to the 13 Vdc screw terminal in the MAG Panel and to the DC terminal J2 DC on the AOX 4 3 Connect a ground wire to the 13 Vdc GND screw ter minal in the MAG and to the G terminal J2 G on the AOX 4 Figure 11 Analog Outputs Field Wiring Connections Fie Power To Microfech j Controller Ground AAE Analog Output g Device Current Mode mee Hdi Hy o 0 0o a C Sg SS C 4f 3 AOX 4 Board 52 9 oc
43. of the NMP OPM or other level controller to 00 level 1 See Addressing the Controllers above for more information 2 Push the circuit breaker CB1 button to power up the level controller and verify that there is power to the MCB by observing the LEDs 3 Check the voltages of port B directly on the AMP con nector block Refer to Figure 12 above Use a DC voltmeter to test for proper voltages With the ground lead on the control panel chassis ground check the voltage at the and ground terminals Refer to Table 9 for the correct voltage levels If no voltage or improper voltage levels are found verify that the panel is energized 4 Plug the network communications AMP connector into port B As a result of the previous procedures the network communications connector should be disconnected from the B port at every controller on the trunk except for the level I controller Be sure that this is true before continuing this procedure For communications to occur each networked level 2 controller must have the proper hex switch setting and the proper voltages at its port B terminals 5 Set the network address hex switch setting to match the address on the engineering schedule Each con troller must have a unique address 6 Turn on power to the level 2 controller Refer to the controller installation manuals for information on how to turn on power to each controller IM 620 Page 1
44. resistances are proper check the resistance of the field supplied loads if any and check the wiring and connections throughout the 5 Vdc power supply circuit Disconnect the connector plugs from the modem and the power plug from all AOX 4 boards as applicable With circuit breaker CB1 open measure the resistance between field terminals DC GRD and 13 Vdc It should be infinite If the resistance is infinite go to step 12 If the resistance is not infinite a short exists some where in the 13 Vdc power supply wiring Reconnect the Aux Out connector plug to the MCB If there s a modem reconnect its AMP plug to port A With circuit breaker CB1 open measure the resistance between field terminals DC GRD and 13 Vdc It IM 620 Page 21 should steadily rise to a value greater than 5000 ohms within approximately 30 seconds If the resistance rises above 5000 ohms go to step 13 If the resistance does not rise above 5000 ohms the MCB is defective 12 One at a time reconnect the modem and each AOX4 board as applicable Each time a component is re connected measure the resistance between field ter minals DC GRD and 13 Vdc It should steadily rise to a value greater than 5000 ohms If the resistance rises above 5000 ohms repeat this step until the modem and all AOX 4 boards as appli cable have been checked out If the problem persists it is indeterminate Obtain factory service If t
45. rk The Network Connect MAG Network Includes a Network Master Panel NMP an Open Protocol Master Panel OPM or other high level MicroTech control panel plus two or more MAG panels Each MAG Panel has one associated absorption chiller unit controller It may also contain other level 2 unit or auxiliary controllers that could be accessed with a PC via network communications In this case the NMP OPM or other high level MicroTech control panel is the level l controller The MAG Panels are level 2 control lers along with any other unit or auxiliary controllers Since the NMP OPM or other high level control panel is a level l its hex switch setting must be 00 The hex switch settings of the MAG Panels and other level 2 controllers must start at 01 and continue consecutively to a maximum of 40 decimal 64 There must be no gaps in the sequence and no dupli cate 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 NMP OPM or other high level control panel and MAG Panels according to their designations Page 16 IM 620 For example assume that a MicroTech network includes an NMP two MAG Panels and two absorption chillers One possible addressing scheme is as follows Hex Switch Setting Controller 00 YMP 01 MAG Panel 1 02 MAG Panel 2 Note The absorption chillers have non MicroTech unit controllers therefore
46. roller scesrsrerreserriserrresssrrrreee 16 Connecting the Communications Trunk 17 SErviCe Inf rmah Maanen eee ate ads eesnee 19 Wimm Diagrams seoan N ER 19 TeSt PrOcedUrOS aaa e a NEET 21 Status LED DIBQNOSUCS successie srne 21 Troubleshooting Power Problems cece 21 Troubleshooting Analog Outputs eee eeeeees 22 Troubleshooting Output Boards 000 ce eeeee eee teens 22 Troubleshooting Solid State Relays eee 24 MCB Replacement iesac cetcceceedc stole cuacdeevan earn eei eana 25 Pets ESE A A E nani 26 McQuay and MicroTech are registered trademarks of McQuay International Monitor and Open Protocol are trademarks of McQuay International Microsoft and MS DOS are registered trademarks of Microsoft Corporation IBM is a registered trademark of International Business Machines Corporation 1995 McQuay International All rights reserved throughout the world Page 2 IM 620 Illustrations Figures 1 MAG Panel layol vraiesosc dicdeincrvstawaeiieiainiadininiet tures 5 2 Microprocessor Control Board MCB aesae 6 Oe TOK So WIG S cage renal aL sed sceacavie ceca ENES 7 4 Software ID Label ccccscceccsccesesesesesesesaseseeeeoeece T 5 Analog Output Expansion Module AOX 4 2 a 8 6 MAG Panel Dimensions 0 0ccececececeeseeeeeeseueaees 10 7 Typical Field Wiring Schematic Network Connect MAG cccccccccceceseeceseececeeeeeanas 12 8 Typical Field Wir
47. s 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 on for 1 second and off for 1 second when communications exists between the MAG and the absorption chiller If the LED is on for 2 10 Of a second and off for 7 10 of a second this in dicates that communications between the MAG and the absorption chiller does not exist 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 Off No power to MCB O Self test failure or power supply problem MCB operating normally On 1 second Off 1 second On 10 second Off 10 second Communications does not exist between the MAG and the absorption chiller Hex Switches The MCB includes two hex hexadecimal switches that are used to set the MAG controller s network address The HI and LO hex switches are shown in Figure 3 A hex switch setting is defined as the HI switch digit followed by the LO switch digit For example a hex switch setting of
48. sorption chiller unit controller another manufacturer s BAS interface device or an IBM compatible PC using the RS 232C inter face standard When port A is used for communications with the absorption chiller unit controller the communica tions rate is 4800 baud with an interface standard of RS 485 When port A connects to the BAS interface device or a PC the communications rate is 9600 baud The PC can be directly connected over a limited distance with a twisted shielded pair cable For more information see PC Connec tion in the Field Wiring section of this manual Port B Port B is for network communications between the MAG and the absorption chiller or the MAG and the level l MicroTech controller using the RS 485 interface standard A twisted shielded pair cable should be con nected to port B via terminals B B and GND on terminal block M The communications rate is 9600 baud For more information see Network Communications in the Field Wiring section of this manual Output Board The Output Board OB accepts up to 24 digital outputs from the MCB Each output has fused sockets and can be used to drive an AC or DC load by selecting a particular relay output module Screw terminals allow for field wiring connections to the output device Each output has an on board LED that illuminates when an output socket that contains a relay is activated by the MCB Following are the Output Board s power rati
49. sword access and advanced trend logging The PC can be connected directly to the MAG 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 MicrolTech system However you can exit the Monitor program to perform other tasks without affecting equipment control Refer to the users manual supplied with the Monitor software for addi tional information PC Specification A direct connected computer can be used for monitoring MAG Panel and unit operation The PC must be an IBM or 100 true compatible Table 7 shows the preferred and minimum PC specifications Table 7 PC Specification Preferred Configuration 486DX processor 66MHz or better 8 MB of RAM or better 120 MB hard disk drive or better 32 floppy disk drive Serial port 9 pin male Com1 or Com2 Parallel nort Internal time clock batterv backed Super VGA graphics capability Super VGA monitor Printer Bus mouse or trackball 101 enhanced keyboard 9600 baud modem compatible with the AT command set optional MS DOS 6 2 or hiaher Microsoft Windows 3 1 or higher MicroTech Monitor for Windows software Network Master Panel The Microtech Network Master Panel NMP allows the MAG Panel s and associated units to be incorporated into a building wide network with other MicroTech unit
50. t If an MCB board is defective and must be replaced the proper controller software must be loaded into the replace ment 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 appropriate MAG controllers program code with the replacement MCB part order If the program codes is not provided the MCB board will be shipped without software Job specific Monitor software includes each unit and auxil lary controller s program Therefore it is possible to down load 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 controllers configu ration data was stored on the PC hard drive prior to the MCB failure the exact configuration can be restored Refer to the users manual supplied with the Monitor software for more information IM 620 Page 25 Parts List EHE 3 Microprocessor Contro Board 654873B 50 Input Conditioning Module Terminal Board 733849C 01 Output Board 492655B 04 z CB ICM Term Brd 4 Transformer 115 24 Vac 606308B 01 Transformer 24 18 Vac Center Tapped 467381B 14 NO m f CB1 Circuit Breaker Fuse MCB Input Power 2 Amp Bussman No GDC 2A Fuse MCB Communicat
51. t is not lit but the load con nected to it is energized either the solid state relay or the MOV is bad The solid state relay contacts and the MOV which are in parallel can both fail closed Perform the fol lowing procedure to isolate the problem 1 Remove power from the controller by opening CB1 Pull the solid state relay from the suspect output s socket 2 Restore power by closing CB1 If the output load remains energized when there is no relay in the socket the output s MOV has failed and thus the Output Board must be replaced If the output load de energizes the relay that was pulled is defective Contact Chatter Contact chatter is very rapid opening and closing of con tacts It is usually caused by low voltage at the electrome chanical relay or contactor coil If contact chatter is occurring on a relay or contactor connected to one of the Output Board solid state relays it is also possible that a faulty connection exists on the power supply terminals of the Aux Out plug connector on the MCB on the MAG field wiring terminals on connector H7 of the Input Conditioning Module Terminal Board or the wiring between the Input Conditioning Module Terminal Board T10 and the Output Board In very rare instances contact chatter can be caused by a faulty solid state relay Perform the following procedure to isolate the problem 1 Verify that the voltage at the load s power supply and at the solid state relay contacts
52. troller eg OPM NMP Board Hot Neutral Communications Interface Cable Microprocessor Line Input Sonia seme Absorption Chiller Unit Controller Page 12 IM 620 Factory Wiring Field Wiring Terminal ICM Terminal A A GND_ D ed ES ice L Foe 9 f ZN i t My A F B B GND To Open Protocot BAS Integrator or Personal Computer Network Connect MAG 2 Field Wiring Cable Shielded Twisted and Jacketed Pair with Drain Wire Hot Neutral Communications Interface Cable Micraprocessor l poms Line Input Absorption Chiller Unit Controller Wiring Instructions Direct Connect MAG The Direct Connect MAG field wiring consists of connecting the MAG to the absorption chiller controller As shown in Figure 8 field wiring to port B can be ac complished by connecting the wires from the Communi cations Interface Cable CIC to terminals B B and GND in the MAG Port A is used for communications with an Open Proto col BAS or connection to a PC in a MicroTech network To Open Protocol BAS or Personal Computer gt Use the following procedure to perform the Direct Connect wiring 1 Connect the Communications Interface Cable ae to the absorption chiller Connect the wires from the CIC to terminals B B and GND in th
53. ver being uS G Direct Connection An RS 232 communications cable kit allows a PC to directly connect to any MicroTech controller It is available from McQuay International The cable has a female DBS 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 the kit cable see Figure 9 RS 232 Cable Pinouts for 9 Pin Serial Ports AMP Connector AMP Plug Female DB 9 Signal Pin Pin Signal TD 1 DCD I RD g Shield VO ont WN O 4 AJ co Analog Output Connection The MAG Panel provides analog output signals from the MCB s Expansion Bus Connector to the Analog Output Expansion Module AOX 4 via a ribbon cable The AOX 4 provides a variable voltage or current control signal to the output devices and is powered by the MAG Panel s 13 Vdc power supply Wiring to the output devices is performed at the AOX 4 s analog output ports Each port has a two pin Phoenix connector with screw terminals for connection to the output device see Wiring Instructions below For more information on the AOX 4 see Bulletin No IM 607 MicroTech Analog Output Expansion Module or refer to Analog Output Expansion Module in the Accessories section of this manual Cable Specification pelow If this is done splice the con ductors
Download Pdf Manuals
Related Search