McQuay MicroTech MAG Installation & Maintenance Data Download Page 28 | Manualshive

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IM620-1

Service Information

Wiring Diagrams

The following wiring diagram is identical to the one in the Network Connect MAG. It is reproduced
here for your convenience. The legend is shown in Figure 14.

Figure 14. Network Connect MAG Schematic Legend

Component Designation

Description

CB1

Circuit Breaker

MCB

Microprocessor Control Board

OB

Output Board

AOX BRD

Auxiliary Output Expansion Board

T1

Transformer: 115/24 Vac

T2

Transformer: 24 Vac/18 Vac-CT

Factory Wire Number

Field Wiring Terminal

Field Wiring

Printed Circuit Board Terminal

Twisted, Shielded Pair Cable

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Summary of Contents for MicroTech MAG

Page 1: ...tion Maintenance Data IM 620 1 Group Controls Part Number 585524Y Date February 1998 1998 McQuay International MicroTech Absorption Gateway for Absorption Chillers MicroTech Absorption Gateway MicroTe...

Page 2: ...unications Trunk 23 Service Information 28 Wiring Diagrams 28 Test Procedures 30 Status LED Diagnostics 30 Troubleshooting Power Problems 31 Troubleshooting Analog Outputs 32 Troubleshooting Output Bo...

Page 3: ...LED Indication 9 Table 4 Amber Status LED Indication 9 Table 5 Program Codes 11 Table 6 Accessory Installation Manuals 11 Table 7 PC Specification 13 Table 8 MAG Panel Environmental Specifications 14...

Page 4: ...stop signals Cooling water inlet outlet temperature Heating cooling simultaneous and abnormality indicators Condensation temperature SVRP and SVRU valves Remote reset setting Cooling main heating mai...

Page 5: ...al 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 Operat...

Page 6: ...his 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 Tab...

Page 7: ...rocessor Control Board The Microprocessor Control Board MCB is shown in Figure 2 It contains a microprocessor that is preprogrammed with the software required to monitor the data from the absorption c...

Page 8: ...ormation on the Analog Output Expansion Module Power In Connector The MCB receives 18 Vac center tapped power through transformer T2 and the Power In connector This power drives all logic and communic...

Page 9: ...On 1 second Off 1 second Communications exists between the MAG and the absorption chiller On 2 10 second Off 2 10 second Communications does not exist between the MAG and the absorption chiller Hex S...

Page 10: ...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 T11 The communications rate is 9600 bps For more informatio...

Page 11: ...VENDOR MDL 280 50 DATE CODE 10 94 MCB part number Program code Ident Table 5 Program Codes MAG Type Program Code Direct Connect 950468 010 Network Connect 950469 010 Accessories The accessories of th...

Page 12: ...C AC DC G Power LEDs 26 pin Expansion Bus Connector 26 pin Expansion Bus Connector Power Connector a0166 MicroTech Monitoring and Networking Options PC Monitoring A PC personal computer equipped with...

Page 13: ...quired 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 Mc...

Page 14: ...screw By adjusting this screw you can prevent the panel door from swinging open or closed unexpectedly Table 8 MAG Panel Environmental Specifications Panel State Temperature Relative Humidity Operatin...

Page 15: ...r 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 5 16 inch hex scr...

Page 16: ...nd MAG 2 It is highly recommended that the installing contractor keep track of the physical order of the controllers on the daisy chained trunk This facilitates troubleshooting any network communicati...

Page 17: ...ble Communications Interface Cable Hot Neutral Hot Neutral Legend Field Wiring Terminal Cable Shielded Twisted and Jacketed Pair with Drain Wire Factory Wiring Field Wiring Line Input Line Input WHT B...

Page 18: ...ions Interface Cable Hot Neutral Legend Field Wiring Terminal Cable Shielded Twisted and Jacketed Pair with Drain Wire Factory Wiring Field Wiring Line Input a0168 PC Connection The PC is connected to...

Page 19: ...connection between the PC and a controller is 50 feet Cable Specification for Direct PC Connection A properly terminated twisted shielded pair cable is required to directly connect a PC to a MicroTech...

Page 20: ...damage The analog output signals voltage mode 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 the M...

Page 21: ...24V GND Ribbon Cable Expansion Bus 13 VDC GND DC GND MCB 24V AC 13V DC 13V DC AOX 4 Board Analog Output Device Current Mode 24 VAC Power Analog Output Device Voltage Mode 24 VAC Power To MicroTech Co...

Page 22: ...For more on hex switch settings see Microprocessor Control Board in the Component Data section of this manual The Network Connect MAG Network The Network Connect MAG Network includes a Network Master...

Page 23: ...ock or directly on the port B connector of the level 1 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 voltage se...

Page 24: ...PORT B FUSE BUSSMAN MCR 1 4 FUSE 1 3 2 4 5 3 1 2 4 6 a0114 Network MAG Controller Connection In order for the NMP OPM or other level 1 controller in a network to connect and communicate with level 2...

Page 25: ...on trunk voltages at the field wiring terminals if any or directly on the connector The trunk must not be connected to the controller when you do this If no voltage or improper voltages are found chec...

Page 26: ...to the MAG Panel or connection to port A if an AMP connector was used Check to see if the MAG Panel and the absorption chiller unit controller are energized Direct Connect MAG Controller Connection T...

Page 27: ...ber LED on the MAG controller stays on for 1 second and goes off for 1 second if communications exists see Table 4 Amber Status LED Indication in the Component Data section of this manual If communica...

Page 28: ...shown in Figure 14 Figure 14 Network Connect MAG Schematic Legend Component Designation Description CB1 Circuit Breaker MCB Microprocessor Control Board OB Output Board AOX BRD Auxiliary Output Expan...

Page 29: ...s reproduced here for your convenience The legend is shown in Figure 16 Figure 16 Direct Connect MAG Schematic Legend Component Designation Description CB1 Circuit Breaker MCB Microprocessor Control B...

Page 30: ...described 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 r...

Page 31: ...ce them Go to step 4 b 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 a...

Page 32: ...o step 13 b If the resistance does not rise above 5000 ohms the MCB is defective 12 One at a time reconnect the modem and each AOX 4 board as applicable Each time a component is reconnected measure th...

Page 33: ...tput 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 energize the solid state relay...

Page 34: ...Restore power by pressing CB1 to the ON position The LED should light regardless of the controller s command a If the output LED illuminates it is likely that the MCB is defective b If the output LED...

Page 35: ...components Output Energized LED not Lit If the LED of a suspect output is not lit but the load connected to it is energized either the solid state relay or the MOV is bad The solid state relay contac...

Page 36: ...re 20 In this circuit a solid state relay behaves like an electromechanical relay If the relay is energized the relay output is hot If the relay is de energized voltage cannot be measured at the relay...

Page 37: ...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 t...

Page 38: ...ibbon Cable Assembly 3 AOX 4 to AOX 4 654997B 06 CIC Communications Interface Cable 50 733173B 01 AOX 4 Analog Output Expansion Module 005532370 1 SSR Solid State Relay Kit 005532390 1 Solid State Rel...

Page 39: ...IM620 1 39...

Page 40: ...40 IM620 1...

Page 41: ...13600 Industrial Park Boulevard P O Box 1551 Minneapolis MN 55440 USA 612 553 5330...

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