McQuay MicroTech MAG Bedienungsanleitung

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

2IM620-1

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

Installation..................................................................................................................14

Panel Location and Mounting............................................................................................................................14

Field Wiring...........................................................................................................................................................15

Power.................................................................................................................................................................15

Network Communications...............................................................................................................................15

PC Connection..................................................................................................................................................18

Analog Output Connection............................................................................................................................20

Digital Output Connection.............................................................................................................................21

Network Commissioning.....................................................................................................................................22

Addressing the Controllers............................................................................................................................22

Connecting the Communications 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 Boards...................................................................................................................33

Troubleshooting Solid-State Relays.............................................................................................................36

MCB Replacement................................................................................................................................................37

Parts List................................................................................................................................................................37

Illustrations

Figure 1. MAG Panel Layout................................................................................................................................7

Figure 2. Microprocessor Control Board (MCB)...............................................................................................8

Figure 3. Hex Switches Showing 01 Setting.......................................................................................................9

Figure 4. Software ID Label.................................................................................................................................11

Figure 5. Analog Output Expansion Module (AOX-4)...................................................................................12

Figure 6. MAG Panel Dimensions......................................................................................................................14

Figure 7. Typical Field Wiring Schematic: Network Connect MAG.............................................................17

Figure 8. Typical Field Wiring Schematic: Direct Connect MAG.................................................................18

Figure 9. RS-232 Cable Pinouts for 9-Pin Serial Ports (AMP Connector)....................................................19

Figure 10. RS-232 Cable Pinouts for 25-Pin Serial Ports (AMP Connector)................................................20

Figure 11. Analog Outputs Field Wiring Connections...................................................................................21

IM620-1 3

Figure 12. AMP Connector Terminal Configuration.......................................................................................24

Figure 13. AMP Connector - CIC Connection.................................................................................................26

Figure 14. Network Connect MAG Schematic Legend...................................................................................28

Figure 15. Network Connect MAG Schematic.................................................................................................29

Figure 16. Direct Connect MAG Schematic Legend.......................................................................................29

Figure 17. Direct Connect MAG Schematic .....................................................................................................30

Figure 18. MCB Power Supply Terminals.........................................................................................................32

Figure 19. Output Board Relay Socket..............................................................................................................34

Figure 20. Testing a Typical Relay Circuit .......................................................................................................36

Figure 21. Testing a Relay Circuit with a Disconnection...............................................................................37

Tables

Table 1. Read-Only Data.......................................................................................................................................4

Table 2. MAG Accessories ..................................................................................................................................6

Table 3. Green and Red Status 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

Table 9. Port B Voltages: AMP Type Connector............................................................................................24

Table 10. Network Communications Field Wiring Terminals ........................................................................24

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.

IBM is a registered trademark of International Business Machines Corporation.

4IM620-1

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.

See Table 1 for the items that can be read from the absorption chiller through the MAG.

Table 1. Read-Only Data

Analog Data Digital Output Data Digital Input Data

Chilled water inlet/outlet

temperature Absorbent solution pumps Start/stop of pumps and blowers

Hot water inlet/outlet temperatures Refrigerant pump Combustion signal

Low/high temperature generator

temperature Ignition signal Remote Start/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 main

Exhaust gas temperature/steam

condensate temperature Alarms

Fuel control valves 1 and 2 position

Inverter Output Signal

Steam control valve output signal

WARNING

Electric shock hazard. Can cause personal injury or equipment damage.

This equipment must be properly grounded. Connections and service to the MicroTech

control panel must be performed only by personnel that are knowledgeable in the operation

of the equipment being controlled.

CAUTION

Static sensitive components. A static discharge while handling electronic circuit boards

can cause damage to the components.

Discharge any static electrical charge by touching the bare metal inside the control panel

before performing any service work. Never unplug any cables, circuit board terminal blocks,

or power plugs while power is applied to the panel.

IM620-1 5

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.

6IM620-1

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.

A MAG is needed for each absorption chiller in a network. 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-1 controller such as a Network Master Panel (MicroTech) or an Open Protocol Master

Panel (Open Protocol) is needed to read and store information 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

Accessories Function

Analog Output Expansion Module (AOX-4) Adds analog outputs

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 1

enclosure. They are interconnected by ribbon cables, shielded multi-conductor cables, or discrete

wiring. Power for the system is provided through transformers T1 and T2.

Following are descriptions of these MicroTech components and their input and output devices.

IM620-1 7

Figure 1. MAG Panel Layout

MCB

GND

Snap Track

ICM Terminal Board

D.C. 13V

GRD 13V

GRD 24V

A.C.

13V

D.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. The various MCB

connections and components are described below.

8IM620-1

Figure 2. Microprocessor Control Board (MCB)

RUNNING

RESET

ACTIVE OUTPUT 0

CPU

STATUS

POWER FUSES

[BUSSMAN GDC-T2A]

POWER IN

[18-24 VCT]

AC AC GND GND

AUX/OUT

DIGITAL OUTPUTS

ANALOG INPUTS DIGITAL INPUTS

ADDRESS

KEYPAD /LCD DISPLAY

COMMUNICATIONS

PORT A PORT B

[FUSE: BUSSMAN MCR-1/4]

FUSE 1

Hex switches

Microprocessor status LED's

EXPANSION BUS

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 through transformer T2 and 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.

Microprocessor Status LEDs

The green, red, and amber LEDs on the MCB provide information about the operating status of the

microprocessor. The amber LED also indicates the existence of alarm conditions.

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 seconds. During this period

the MCB performs a self-test.

2. The red LED turns off and the green (“Running”) LED turns on. This indicates that the

microprocessor has passed the self-test and is functioning properly.

IM620-1 9

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

2/10 of a second, this indicates 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

Green LED State Red LED State Indication

Off Off No power to MCB

Off On* Self-test failure or power supply

problem

On Off MCB operating normally

* For longer than 5 seconds.

Table 4. Amber Status LED Indication

Amber LED State Indication

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 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 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 3/32-inch

tip. If a hex switch setting is changed, power to the MCB must be cycled in order to enter the new

setting into memory. This can be done by turning the panel’s power switch off and then back on.

Figure 3. Hex Switches Showing 01 Setting

HI (left) hex switch LO (right) hex switch

10 IM620-1

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. Each port has six terminals and is set up

for both the RS-232C and RS-485 data transmission interface standards. The male and female

connectors for these ports are manufactured by AMP. Therefore, they are referred to as “AMP plugs”

or “AMP connectors” throughout this manual. Socketed fuses located next to the ports protect the

communications drivers from voltage in excess of ±12 V. Following are brief descriptions of each

port’s function.

Port A: Port A is for communications with an absorption chiller unit controller, another

manufacturer’s BAS interface device, or an IBM compatible PC using the RS-232C

interface standard. When port A is used for communications with the absorption chiller

unit controller, the communications rate is 4800 bps with an interface standard of RS-485.

When port A connects to the BAS interface device or a PC, the communications rate is

9600 bps. The PC can be directly connected, over a limited distance, with a twisted,

shielded pair cable. For more information, see “PC Connection” 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-1 MicroTech controller 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 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 onboard

LED that illuminates when an output socket that contains a relay is activated by the MCB. Following

are the Output Board’s power ratings.

•120V ~ 50/60 Hz

•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 communications field wiring terminals. Terminals B+, B–,

and GND connect to either a level–1 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 connector that attach to the MCB port A and port B.

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