Table of Contents
Troubleshooting
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Summary of Contents for McQuay MicroTech MAG
- Page 1 Installation & Maintenance Data IM 620-1 Group: Controls Part Number: 585524Y Date: February 1998 MicroTech® Absorption Gateway for Absorption Chillers MicroTech Absorption Gateway MicroTech a0170 © 1998 McQuay International...
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Page 2: Table Of Contents
Contents Contents ..................................2 Illustrations ................................2 Tables:..................................3 Introduction ................................4 General Description ......................6 Component Data..............................6 Microprocessor Control Board ........................7 Output Board ..............................10 Input Conditioning Module Terminal Board ....................10 Software ID................................11 Accessories................................11 Solid State Relay Kit ............................11 Analog Output Expansion Module .......................12 MicroTech Monitoring and Networking Options...................12 PC Monitoring..............................12 Network Master Panel.............................13 Open Protocol..............................13... -
Page 3: Tables
Table 11. Network MAG Controller - CIC Connection..................25 Table 12. Direct MAG Controller - CIC Connection ..................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. -
Page 4: Introduction
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 control of the chiller. - Page 5 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.
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Page 6: General Description
General Description The MicroTech® Absorption Gateway (MAG) is a microprocessor-based controller used as a read- only interface between a MicroTech absorption chiller and a MicroTech or Open Protocol partner’s building automation system (BAS). No control of the absorption chiller is performed through the MAG. -
Page 7: Microprocessor Control Board
Figure 1. MAG Panel Layout ICM Terminal Board Snap Track D.C. D.C. D.C. A.C. Microprocessor Control Board The Microprocessor Control Board (MCB) is shown in Figure 2. It contains a microprocessor that is preprogrammed with the software required to monitor the data from the absorption chiller(s) and other equipment that is connected to the MAG such as sensors or actuators. -
Page 8: Figure 2. Microprocessor Control Board (Mcb)
Figure 2. Microprocessor Control Board (MCB) EXPANSION BUS ADDRESS FUSE 1 Hex switches PORT A PORT B COMMUNICATIONS [FUSE: BUSSMAN MCR-1/4] RUNNING RESET STATUS ACTIVE OUTPUT 0 Microprocessor status LED's POWER FUSES [BUSSMAN GDC-T2A] DIGITAL OUTPUTS AUX /OUT 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. -
Page 9: Figure 3. Hex Switches Showing 01 Setting
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 of a second and off for of a second, this indicates that communications between the MAG and the absorption chiller does not exist. -
Page 10: Output Board
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 control devices. Communication Ports The MCB has two communication ports: port A and port B. -
Page 11: Software Id
(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... -
Page 12: Analog Output Expansion Module
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 AOX-4 is inserted 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 configure the output ports to one of the following current/voltage selections: •... -
Page 13: Network Master Panel
PC and Monitor software, 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. -
Page 14: Installation
Installation Panel Location and Mounting The MAG panel is suitable for indoor use only. Table 8 lists the allowable temperature and humidity ranges. Locate the panel at a convenient height, and allow adequate clearance for the door swing. Mount the panel to the wall with screws or bolts. Four ¼-inch openings are provided at the corners of the panel. -
Page 15: Field Wiring
Field Wiring Following are descriptions of the various field wiring requirements 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 ordinances. The warranty is void if wiring is not in accordance with these instructions. - Page 16 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 (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).
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Page 17: Figure 7. Typical Field Wiring Schematic: Network Connect Mag
Figure 7. Typical Field Wiring Schematic: Network Connect MAG Level-1 Controller To Open Protocol BAS Integrator (eg. OPM, NMP) or Personal Computer Port Port See Note A+ A- A+ A- ICM Terminal ICM Terminal Board Board B+ B- GND B+ B- GND Network Connect MAG #1 Network Connect MAG #2 Neutral... -
Page 18: Pc Connection
Use the following procedure to perform the Direct Connect wiring: Connect the Communications Interface Cable (CIC) to the absorption chiller. Connect the wires from the CIC to terminals B+, B–, and GND in the MAG as shown in Figure 8. Figure 8. -
Page 19: Figure 9. Rs-232 Cable Pinouts For 9-Pin Serial Ports (Amp Connector)
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 DB9 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. -
Page 20: Analog Output Connection
Figure 10. RS-232 Cable Pinouts for 25-Pin Serial Ports (AMP Connector) AMP Plug Female DB-25 Signal Signal Black White – – Shield a0110 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. -
Page 21: Digital Output Connection
Connect the positive (+) wire of the analog output signal to the + terminal of the two-pin Phoenix connector (J3-J6). Connect the ground (–) wire of the analog output signal to the – terminal of the two-pin Phoenix connector (J3-J6). Position the Analog Switch Selectors to correspond to the analog output signal. -
Page 22: Network Commissioning
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. Depending on the application, either two conductors (Belden 8762 or equivalent) or three conductors (Belden 8772 or equivalent) are required. -
Page 23: Connecting The Communications Trunk
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-1 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. -
Page 24: Figure 12. Amp Connector Terminal Configuration
If there is continuity for each conductor pair, the wiring is continuous and it is likely (but not guaranteed) that the terminations are correct throughout the trunk. If there is no continuity for one or more conductor pairs, there may be a break in the trunk or the at one or more controllers may have been mixed up. -
Page 25: Table 11. Network Mag Controller - Cic Connection
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-1 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. -
Page 26: Figure 13. Amp Connector - Cic Connection
Figure 13. AMP Connector - CIC Connection AMP Plug Signal White – Uncased end Black of CIC Shield – Connect the CIC to the absorption chillers unit controller display processor port. Verify communications have begun between the MAG Panel and the absorption chiller unit controller. - Page 27 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 cycle on and off or (2) the amber 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”...
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Page 28: Service Information
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 Circuit Breaker Microprocessor Control Board... -
Page 29: Figure 15. Network Connect Mag Schematic
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 The following wiring diagram is identical to the one in the Direct Connect MAG. It is reproduced here for your convenience. -
Page 30: Test Procedures
Figure 17. Direct Connect MAG Schematic To "Line" input on Absorption Chiller Unit Controller To BAS Integrator Personal Computer 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. -
Page 31: Troubleshooting Power Problems
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 create an excessive load on the power supply. -
Page 32: Troubleshooting Analog Outputs
If the resistance is less than 20 ohms, it is likely that the Output Board, the ICM Terminal Board, or an external (field supplied) load is excessively loading the 5 Vdc power supply. Isolate the problem by measuring resistance on each of these devices with the wires off. The resistance across the power input terminals on the Output Board (+ and –) should not be less than 3000 ohms. -
Page 33: Troubleshooting Output Boards
Try cycling power to the controller by opening and then closing circuit breaker CB1. Check the ribbon cable(s), power wiring from MAG to the AOX-4, field wiring connections from the AOX-4 to the analog output device, and the power wiring from the external power supply to the output device. -
Page 34: Figure 19. Output Board Relay Socket
Figure 19. Output Board Relay Socket Fuse *250V ~ 50/60 Hz *120V ~ 50/60 Hz Test Resistor 330-680 Ohm 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: Remove power from the controller by opening CB1. - Page 35 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 Module Terminal Board (H7), Aux/Out terminal strip and the MAG field wiring terminal strip.
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Page 36: Troubleshooting Solid-State Relays
Remove power from the controller by opening CB1. Try to improve the connections in the Aux/Out plug insulation displacement terminals by pressing down on the wires with a small screwdriver. 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. -
Page 37: Mcb Replacement
Figure 21. Testing a Relay Circuit with a Disconnection 115 VAC Output Board DO 13 Neutral 115V 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. - Page 38 Component Description Part No. Designation — Ribbon Cable Assembly: MCB to ICM Terminal Board Analog 733758B-02 Input — Ribbon Cable Assembly: MCB to ICM Terminal Board Digital 733758B-01 Input — Ribbon Cable Assembly (9"): MCB to AOX-4 654997B-02 — Ribbon Cable Assembly (3"): AOX-4 to AOX-4 654997B-06 Communications Interface Cable - (50’) 733173B-01...
- Page 39 IM620-1...
- Page 40 IM620-1...
- Page 41 13600 Industrial Park Boulevard, P.O. Box 1551, Minneapolis, MN 55440 USA (612) 553-5330...
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