Installation and Maintenance Manual

66 VAV-SVX07A-EN
Troubleshooting
• Blinks red when an alarm exists.
LINK
• The TX LED blinks green at the data transfer rate when the Tracer™ UC400 controller transfers
data to other devices on the link.
• The RX LED blinks yellow at the data transfer rate when the Tracer UC400 controller receives
data from other devices on the link.
IMC
Not used.
Service
Shows solid green when pressed.
BO1 to BO9
Shows solid Yellow when corresponding binary output is on.
Green Service LED
Table 11, p. 66 shows and describes green service LED activity.
Tracer UC400 Controller Failure Troubleshooting Procedures
WARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it may be necessary
to work with live electrical components. Have a qualified licensed electrician or other individual
who has been properly trained in handling live electrical components perform these tasks.
Failure to follow all electrical safety precautions when exposed to live electrical components
could result in death or serious injury.
1. Check the incorrect supply voltage or no voltage.
• Check Marquee LED.
• Shows solid green when the Tracer UC400 controller is powered and operating normally.
• Shows solid red when the Tracer UC400 controller is powered, but represents low power
or a malfunction.
• If marquee LED is solid red, check incoming power. Measure the power input to the
Tracer UC400 controller on XFMR 24 VAC input and . The supply voltage should be
between 19 and 30 VAC (24 VAC cataloged). However, voltages at either extreme may result
in system instability.
• If no voltage, check up stream of controller to see were voltage has been interrupted. See
complete wiring diagrams, Figure 37, p. 86 to Figure 44, p. 93.
Table 11. Green service LED activity
Green Service LED Activity Description
LED is Off continuously after power is applied to the
controller
Normal operation
LED is On continuously, even when power is first applied to
the controller
Someone pressed the Service push button or the controller
failed
LED flashes approximately once every two seconds
Uninstalled (normal controller mode). Use the Tracer TU
service tool service tool to restore the unit to normal
operation.