Programming Guide

VAV-SVP01A-EN 87
Troubleshooting
Troubleshooting Procedures
VV550 Failure 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. Incorrect supply voltage/No voltage
• Check Green Status LED.
• Shows solid green when the VV550 is powered and operating normally.
• If Green Status LED is off, check incoming power. Measure the power input to VV550 board
on TB1-1 24VAC input and ground TB1-2. The supply voltage should be between 19 and 30
VAC (24VAC 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 59, p. 107 to Figure 66, p. 114.
2. Check for short
• Remove all wires from controller except incoming power.
• Check device using Rover service tool to see if the VAV VV550 is operating properly. If VV550
does operate properly check inputs/outputs for a short.
3. For final step check program by downloading good program using Rover Service tool. See the
Saving VAV Program-portion of the VAV VV550 Controller Programming and Operation section.
Note: For Instructions on how to use Rover, refer to the Rover Help by clicking on Rover Help
in the Help menu.
4. If controller is still failed, replace controller.
Ta b l e 1 8 . Green status LED activity
Green Status LED Activity Description
On Power On, normal operation
Off One of the following:
•Power Off
• Controller failure
• Test button pressed
Blinking for 10 seconds,
0.25 seconds Off; 0.25 seconds On
Wink mode
(a)
(a) The wink feature enables you to identify a controller. By sending a request from the Rover™ service tool, you can request
the controller to wink.
One blink continuously,
0.25 seconds Off; 2.25 seconds On
The controller is in the manual output test mode and no
output-override unit diagnostic
(b)
conditions
(b) See the diagnostic topic in this guide for a complete list of output override diagnostics.
Two blinks continuously,
0.25 seconds Off; 0.25 seconds On
0.25 seconds Off; 1.75 seconds On
The controller is in the manual output test mode and one
or more output-override unit diagnostic
(b)
conditions exist