Trane CNT-SVX07C-EN 用户手册

The green (status) LED on the Tracer ZN521 controller (see Figure 19 on 
page 51) indicates whether the controller has power applied to it and if 
the controller is in manual test mode (see Table 14).

The yellow (communications) LED on the Tracer ZN521 controller (see 
Figure 19 on page 51) indicate the controller’s communication status (see 
Table 15).

LED is on continuously.

Power is on (normal operation).

LED blinks (one recurring blink).

Manual output test mode is being 
performed and no diagnostics are 
present.

LED blinks (blinks twice as a recur-
ring sequence).

Manual output test mode is being 
performed and one or more diag-
nostics are present.

LED blinks (1/4 second on, 
1/4 second off for 10 seconds).

The Auto-wink option is activated, 
and the controller is 
communicating.

1

LED is off continuously.

Either the power is off, 
the controller has malfunctioned, or 
the Test button is being pressed.

1

 By sending a request from the Rover service tool, you can request the controller’s 
green LED to blink (“wink”), a notification that the controller received the signal 
and is communicating.

LED is off continuously

The controller is not detecting any 
communication (normal for stand-
alone applications).

LED blinks.

The controller detects communica-
tion (normal for communicating 
applications, including data sharing).

LED is on continuously.

Problem with communication link 
wiring (possible need for termination 
resistor), or controller failure (caused 
by power surge, lightning strike, etc.)