Green Status LED

Yellow Comm LED

UNT-IOM-6

Tracer® ZN.520

Troubleshooting

Table 32. Green Status LED activity

Green LED activity

Description

On continuously

Power on (normal operation)

Blinks (one blink)

The controller is in manual output test mode.

 

No diagnostics present.

Blinks (2 blinks)

The controller is in manual output test mode.

 

One or more diagnostics are present.

LED blinks (1/4 sec.

Wink mode (Note 1).

on, 1/4 sec., off for

 

10 sec)

 

LED off

Power is off.

 

Controller failure.

 

Test button is pressed.

Note 1: The Wink feature allows you to identify a controller. By sending a request from Rover service tool, you can request the controller to wink (blink on and off as a notification that the controller received the signal). The green LED blinks (1/4 second on, 1/4 second off for 10 seconds) during Wink mode.

The yellow Comm LED blinks at the rate the controller receives communication. The yellow LED does not blink when the controller is transmitting communication data.

Table 33. Yellow Comm LED Activity

LED activity

Description

Off continuously

The controller is not detecting any

 

communication. (Normal for

 

standalone applications.)

LED blinks or flickers

The controller detects communica

 

tion. (Normal for communicating

 

applications, including data shar

 

ing.)

LED on continuously

Abnormal condition or extremely

 

high traffic on the link.

The test sequence verifies output and end device operation. Use the manual output test to verify output wiring and actuator operation without using Rover™ service tool.

If the diagnostics remain after an attempt to clear diagnostics, the status LED indicates the diagnostic condition is still present and may affect the manual output test.See the Green Status LED section. Advancing completely through the test sequence terminates manual test. The controller will time out if the unit remains in a single step for one hour.

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Trane LO manual Green Status LED Yellow Comm LED, Green Status LED activity Green LED activity Description

LO specifications

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