varitrac 3 ccp

[gman9616]

I have a varitrac 3 ccp with a display screen 2 zones bypass
damper assembly and a voyager rtu. problem is that the vari trac is displaying com failure too all items in the daisy chain i checked each control seperatly it list a priority shut down has happend .any ideas the smoke detector in the duct work is not connected to the controller ccp block
it only turns power of to the system through a relay at the voyager unit itself. Thanks in advance

[shelby]

do you have CCP software to connected to the ccp panel directly? or rover to hook onto the com4 link to see if you can read all the boxes? Occasionaly on a certain version on the ucm board (I don"t remember the number) if there is any sort of chatter on the com link, It will take the whole link down- shut the power off to all vavs and the ccp, turn power back on and see if the link comes back up! A priority shut down is issued as a result of the com failure

[kwillmech]

Originally posted by shelby
... Occasionaly on a certain version on the ucm board (I don"t remember the number) if there is any sort of chatter on the com link, It will take the whole link down- shut the power off to all vavs and the ccp, turn power back on and see if the link comes back up! A priority shut down is issued as a result of the com failure

UCM version 4.1 (refer to VAV-SVB06A-EN and VAV-SVB09A-EN).

There is also a Priority Shutdown contact on the CCP3 termination board.

[gman9616]

i dont have a rover is that a laptop program or a tool? I have isolated every ucm from the network or daisy chain and replaced the bypass sensor package on the supply all dampers function and i checked for polarity is there a way to check for the ccp com directly? i can connect through a laptop and bring up system settings etc but no communication to anything no remote room sensors or even the hvac unit.

[shelby]

did you shut the power off to all ucm's, bypass damper and rooftop at the same time? to try and reset it? No you can not hook up your laptop directly without the varitrac software, if it was the old style panels you could by using hyperterminal on your laptop however it is not. Rover is a Trane program that allows you to hook your laptop up to the ucm directly on the com terminals (used to configure ucms and much more. Seeing as though you do not have access to this stuff try the power thimg first if that doesn't work something is dragging the link down it could be a shorted wire, defective TCI board, UCM board try disconnecting certain points on the daisy chain to see if the com pops back up hope this helps!!!!!!!!!maybe its just the touch screen display that is defective

[controldude]

You need varitrac V12 SP3 Bakup system download latest ver upgrade in sotware pack then restore database should take care of problem.

[kwillmech]

Most likely a wiring problem.

[gman9616]

yes turned off power removed links from one ucm to the other restored power to tracker first then to hvac unit even if hvac unit is left off the tracker should at least indicate that that zones are up and indicate hvac unit failure i suspect that ccp comm has failed i was wandering if there was a test to determine for sure that was the case
thanks for the input

[controlquiz]

To check out the wiring power off all equipmnet and at the Varitrac ccp disconnect the comm wiring and then check each wire for continuity to ground. The positive and negitive of the comm should show some resistant to ground,megs worth. The shield should show open to ground as well. If there is a connection to ground then go to next ucm in link and remove comm from it and repeat of each side of comm, back to varitrac ccp and to next controller. Follow the short till found. If there is no short to ground at varitrac ccp test the varitrac is likely bad.

[kwillmech]

You can also monitor the AC voltage on the link terminals. You will see is pulsing with a high voltage between about 1.5 and 4 volts. If the pulses don't get higher than 1 volt you most likely have a short or a defective module taking down the link. Best thing to do is use a scope to see waveform. Wiring is most always the culprit!

BTW, what kind of comm link wire are you using? Hopefully not phone cable!!!

[fonzy40]

check your address on all vav boxes. If your addresses are over 16 that could be your problem. Also make sure your wire is shielded and the shield is grounded on one end. Check that all boxes are addressed differently and that your com board in the voyager is set to non-isolated.