I'm running a distribution terminal on ControlLogix 5580. It's been stone cold where we are and we haven't run some of this equipment since being hit by the deep freeze. The PLC and MCC are housed in a converted Conex box that has a heater, but it hasn't been functioning for several years.
Today out of no where we had 2 Devicenet failures, one on a large motor run off an AB SMC, the other a simple motor. The guys were able to clear the faults by rebooting them, and they would both start but reported higher than normal startup current. The current on the small motor came down to a normal level then would trip, the larger reported VERY high startup current and shut down almost immediately.
We couldn't find any problems with either of these, but the guys put a small space heater in the Conex so he could thaw himself out from time to time. We never did find an issue, but it started working normally again just a little while ago.
The only thing I can think of is that the room itself was warmer now, it got up to about 60 degrees in there. Is it likely that this was the source of the problem?
Today out of no where we had 2 Devicenet failures, one on a large motor run off an AB SMC, the other a simple motor. The guys were able to clear the faults by rebooting them, and they would both start but reported higher than normal startup current. The current on the small motor came down to a normal level then would trip, the larger reported VERY high startup current and shut down almost immediately.
We couldn't find any problems with either of these, but the guys put a small space heater in the Conex so he could thaw himself out from time to time. We never did find an issue, but it started working normally again just a little while ago.
The only thing I can think of is that the room itself was warmer now, it got up to about 60 degrees in there. Is it likely that this was the source of the problem?