Good morning everyone,
I recently attended the trane factory training in wisconsin for the centravac familiarization course back in May. I did not have a chance to attend the controls course yet and was wondering if someone here might be able to point me in the right direction for checking a problem I had with a CVHF machine.
I log a CVHF410 machine that recently had a shutdown occur. The fault on the ch530 panel was an over voltage fault. This machine is equipped with a vfd. The machine shut down at 5:30 in the afternoon and the tracer system shows that the ucm diagnostic is a ch-1 new over voltage and a couple of seconds later the pumps start/st op was off and tower enabled off. The system re started itself about an hour later on its own.
I read in the literature provided by my class that the machine will fault if the voltage is around 115% higher for 60 seconds, and then reset itself after dropping back down to 110%? What stumps me is that it took an hour for the machine to reset itself. I find this impossible to believe that the voltage was high for an hour and no other equipment in the bldg. was affected like ahu's and such all of which are on vfd's of their own. Can someone shed some light on what I might be able to look into as far as knowing how the machine monitors the voltage and if the monitoring system might be giving some false readings? Thanks so much guys!!