McQuay ASC-100 Installation Manual

Installation & Maintenance Data IM 657-1

MicroTech® Series-100 Application Specific Controller

Group: Controls Part Number: 594861Y Date: March 1998

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Contents

Contents ..................................................................................................................................................................2

Illustrations.............................................................................................................................................................2

Tables.......................................................................................................................................................................2

Introduction............................................................................................................................................................4

General Description......................................................................................................5

Component Data.....................................................................................................................................................5

Microprocessor Control Board........................................................................................................................5

Field Wiring Terminal Board.............................................................................................................................8

Software ID..............................................................................................................................................................9

MicroTech Monitoring and Networking Options.............................................................................................9

PC Monitoring....................................................................................................................................................9

Network Master Panel.......................................................................................................................................9

Installation..................................................................................................................11

Panel Location and Mounting............................................................................................................................11

Field Wiring...........................................................................................................................................................12

Power .................................................................................................................................................................12

Network Communications...............................................................................................................................12

PC Connection..................................................................................................................................................14

Analog/Digital Inputs .....................................................................................................................................17

Service Information .................................................................................................... 20

Wiring Diagram.....................................................................................................................................................20

Test Procedures....................................................................................................................................................21

LED Diagnostics ..............................................................................................................................................21

Troubleshooting Power Problems .................................................................................................................21

Troubleshooting Analog/Digital Inputs ......................................................................................................22

Troubleshooting Digital Outputs..................................................................................................................22

MCB Replacement................................................................................................................................................22

Parts List................................................................................................................................................................23

Illustrations

Figure 1. MicroTech ASC-100 Panel Layout......................................................................................................5

Figure 2. Microprocessor Control Board (MCB)...............................................................................................6

Figure 3. Hex Switches...........................................................................................................................................6

Figure 4. Input Switches........................................................................................................................................7

Figure 5. Field Wiring Terminal Board.................................................................................................................9

Figure 6. ASC-100 Panel Dimensions................................................................................................................11

Figure 7. Field Wiring Schematic: Typical Network with ASC-100...............................................................14

Figure 8. RS-232 Cable Pinouts for 9-Pin Serial Ports (AMP Connector)....................................................16

Figure 9. RS-232 Cable Pinouts for 25-Pin Serial Ports (AMP Connector)..................................................16

Figure 10. RS-232 Cable Pinout for 9-Pin Serial Ports (Phoenix Connector)................................................16

Figure 11. RS-232 Cable Pinout for 25-Pin Serial Ports (Phoenix Connector)..............................................16

Figure 12. Analog/Digital Inputs Field Wiring Connection...........................................................................18

Figure 13. Digital Output - Normally Open Contacts......................................................................................19

Figure 14. Digital Output - Normally Closed Contacts ...................................................................................19

Figure 15. ASC-100 Panel Schematic Legend...................................................................................................20

Figure 16, ASC-100 Panel Schematic.................................................................................................................20

Figure 17. MCB Power Connector.....................................................................................................................22

Tables

Table 1. Maximum Output Ratings.......................................................................................................................7

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Table 2. PC Specification.....................................................................................................................................10

Table 3. ASC-100 Panel Environmental Specifications...................................................................................11

McQuay, AAF, 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. ©1998 McQuay International. All rights reserved throughout the world.

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Introduction

This manual provides information about the MicroTech® Series 100 Application Specific Controller (ASC-100). It describes the ASC-100’s components, field wiring requirements, and service procedures.

The versatile ASC-100 controller monitors and controls a variety of mechanical and electrical environmental equipment in a MicroTech building automation system (BAS). The ASC-100 uses custom configured software written for each application. This provides the customers with a wide range of options for monitoring and controlling their HVAC equipment.

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.

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 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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General Description

The MicroTech Series 100 Application Specific Controller (ASC-100) is a microprocessor-based controller used to monitor and control pieces of hardware that do not have MicroTech controls factory installed. Typical applications of the ASC-100 include control of lighting, boiler systems, circulating pumps, and air handlers.

The ASC-100’s design offers input and output flexibility. The ASC-100 supports eight inputs (analog or digital) and eight digital outputs.

Component Data

Figure 1 shows the control panel layout for the ASC-100. The main components of the control system include the Microprocessor Control Board (MCB) and the Field Wiring Terminal Board (FWTB). The MCB contains hex switches, power-in connector, relays, status LEDs, inputs switches, communication ports, and a 1.5-amp fuse.

The FWTB contains terminal blocks with screw terminals for connecting analog/digital inputs, digital outputs, and auxiliary power.

Transformers T1 and T2 provide power to the controller. A 0.5-amp circuit breaker protects the controller against power surges and over-voltages. These major components are mounted inside a NEMA 1 enclosure.

Figure 1. MicroTech ASC-100 Panel Layout

GRD

L2 51

52 53 54 55

TB1

CB1

MCB FWTB

Microprocessor Control Board

Figure 2 shows the Microprocessor Control Board (MCB). It contains a microprocessor that has custom software written to monitor and control the equipment connected to the ASC-100. This custom software is normally loaded into the MCB at the job-site. The various MCB connections and components are described below.

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Figure 2. Microprocessor Control Board (MCB)

Electromechanical Relays

Hex Switches

Communications Ports

Watchdog LED

Port A Select

Digital Input Status LEDs

1 2 3 321

Port A Port B

Status LED

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Reset LED

Output Status LEDs

Input Switches

Hex Switches

The MCB includes two hex (hexadecimal) switches that are used to set the ASC-100 controller’s network address.

The HI and LO hex switches are shown in Figure 3 (hex switch setting 01 shown). 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.” In most cases, the ASC-100’s hex switch setting is set between 01 and 40 (level-2).

Note: To change the setting of a hex switch, use a 3/32-inch tip, slotted-blade screwdriver. Insert the screwdriver into the slot on the hex switch, then turn it to the position required. If a hex switch setting is changed, cycle power to the MCB by opening and closing the circuit breaker located in the power section of the control panel. By cycling power, the new switch setting is entered into memory.

Figure 3. Hex Switches

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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. Refer to the panel’s wiring diagram or Figure 16 for more information.

Electromechanical Relays

The single-pole double through (SPDT) electromechanical relays drive digital outputs connected to the Field Wiring Terminal Board. Depending on the wiring setup, the relay can be normally open or normally closed (see “Digital Outputs” below). See Table 1 for the relay’s output ratings.

Table 1. Maximum Output Ratings

Voltage Output Rating

30 Vdc 20 watts resistive,

10 watts inductive

30 Vac 30 VA resistive,

20 VA inductive

LEDs

The MCB has the following LEDs: Digital Output Status, Digital Input Status, Watchdog, Reset, and Status.

• The Digital Output Status LED is lit when a digital output is activated. There are eight Digital

Output Status LEDs, one for each electromechanical relay. When the relay is energized, the LED illuminates.

• The Digital Input Status LED is lit when an input switch is set to “Contact” and a digital input

signal is present. There are eight Digital Input Status LEDs located below the input switches (see “Input Switches” below).

• The Reset LED illuminates for 5 seconds when power is applied to the MCB. The LED’s location

is on the right side of the MCB mounting plate.

• The Status LED indicates when the MCB is operational and ready to communicate by flashing.

• The Watchdog LED operates the same as the Reset LED.

Input Switches The input switches select the type of input signal connected to the Field Wiring Terminal Board (see

Figure 4). There are eight input switches with each switch having four positions (thermistor, 4-20 mA, 0–5 Vdc, or contact). For example, if the device connected to input 0 is a thermistor type input, input switch SW0 is set to position 1. Switches SW1 through SW7 are set the same way depending on the type of input that is field wired to the Field Wiring Terminal Board.

Figure 4. Input Switches

INPUT SWITCHES

SW0 SW1 SW2 SW3 SW4 SW5 SW6 SW7

THERMISTOR

4–20 mA 0–5 Vdc

CONTACT

(POS. 1)

(POS. 2) (POS. 3)

(POS. 4)

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Communication Ports The MCB contains two communication ports: port A and port B. Each port includes three terminals.

The Port A Select switch, located below the hex switches, enables the user to select RS-232 or RS-485 data transmission for port A. Moving the switch to the left position sets up RS-232 data transmission while moving the switch to the right sets up RS-485 data transmission. The MCB uses Phoenix type connectors for the ports. Following are brief descriptions of each port’s function.

Port A Port A (TS1) is usually used for communications with an IBM compatible PC using the RS-

232 interface standard. The PC can be directly connected, over a limited distance, with a twisted, shielded pair cable. The default communications rate is 9600 bps. For more information, see “PC Connection” in the “Field Wiring” section of this manual.

Port B Port B is for MicroTech network communications using the RS-485 interface standard. A

twisted, shielded pair cable should be connected to port B (TS2). The communications rate is 9600 bps. For more information, see “Network Communications” in the “Field Wiring” section of this manual.

Field Wiring Terminal Board Figure 5 shows the Field Wiring Terminal Board. The Field Wiring Terminal Board has field wiring

terminals for analog/digital inputs, digital outputs, and auxiliary power.

Analog/Digital Inputs Screw terminals on TB4 and TB5 enable the user to connect an analog input or a digital input (dry

contact ) to the ASC-100. Inputs are labeled IN 0 through IN 7. Each input has two screw terminals associated with it. For example: IN 0 includes screw terminals TB5-28 and TB5-29 (see Figure 5). For more information, see “Analog/Digital Inputs” in the “Field Wiring” section of this manual.

Digital Outputs Screw terminals on TB1, TB2, and TB3 enable the user to wire a digital output to the ASC-100. The

digital outputs are labeled Output 0 through Output 7. Each output consists of three screw terminals. For example: Output 0 includes screw terminals TB1-1, TB1-2, and TB1-3. If the output is to be normally open, screw terminals 1 and 2 are used. If the output is to be normally closed, screw terminals 2 and 3 are used. For more information, see “Digital Outputs” in the “Field Wiring” section of this manual.

Power Auxiliary power sources are available at screw terminals TB3-25 and TB3-26 (13 Vdc), and screw

terminals TB4-36 and TB5-37 (5 Vdc). These terminals can be used to power peripheral devices.

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