Binary Output (Relay Output) Troubleshooting - Trane Tracer MP503 Installation And Operation Manual

Input/output module

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Manual (7 pages)

Installation, operation and maintenance manual (32 pages)

Table Of Contents

Table of Contents

Table 14. Binary output (relay output) troubleshooting of external wiring

Step number

Step 1

Perform the initial troubleshooting steps described in Table 13 on page 32

and verify that general board operation is okay.

Step 2

Inspect the wiring. Is there a good connection between the wire and the ter-

minal blocks? Look for shorts or opens. Pay particular attention to wire

splices.

Step 3

Look at the status LED for the binary output you are troubleshooting. (See

"Binary output LEDs" on page 28.) If the LED is on, the Tracer MP503 is

energizing its output relay.

Use your meter (set to measure ac voltage) to measure the voltage across the

binary output terminals you are troubleshooting on the Tracer MP503.

If the voltage is approximately 24 V, the problem lies beyond the Tracer

MP503. Is the wiring to the equipment good? Is there a pilot relay and is it

functioning correctly? Is a Hand-Off-Auto (HOA) switch overriding the

equipment?

If the voltage is approximately 0 V, proceed to the next step.

Step 4

Remove the wires from the binary output terminals and measure the voltage

again.

If the voltage is 24 V, there is a wiring or equipment problem external to the

Tracer MP503.

If the voltage is still approximately 0 V, the Tracer MP503 is commanding the

output to be off and you need to investigate the Tracer MP503 further. See

Table 15 on page 34 to troubleshoot the configuration and operation of the

binary output.

CNT-SVX09B-EN

Binary output (relay output)

troubleshooting

If a binary output (relay output) is not turning on the equipment wired to

it, then follow the troubleshooting steps in Table 14. Perform the steps in

the order they are listed.

The troubleshooting steps assume the equipment connected to the binary

output is off when you think it should be on. The steps are nearly the

same if the equipment is on when you think it should be off.

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