DeviceNet
DeviceNet
(OP)
Our plant uses DevieNet as an interface from our motors to our DCS. What happens is sometimes during summer we have a couple of motors, a select three on different MCC's that give us problems by randomly shutting down( unfortunately two of these motors will take out the whole front end of the plant) and leaving no details as to why. Was wondering if anybody else had these situations in their plant and what was done to rectify the problem.





RE: DeviceNet
RE: DeviceNet
It makes a lot of difference.
Actually, is could be solid state softstarting, too.
Please advise which, and what it takes to get the motor to restart.
RE: DeviceNet
gristlehead thanks for the tips we are in conformance with lengths and grounds( I work in the Canadian artic where grounding is questionable at best) , but never really checked V's at time of drop out, and I believe DeviceNet is deterministic.
RE: DeviceNet
As far as the other device loosing its config, power loss or spike either one could do it. I would be suspect of the device itself. It should hold its config. Possible internal battery failure?
With thinking that both of these are cross the line starters, how old are they? Do they have any noise or chatter to them when picked up? If they do make raquet when energized be aware that it may only take less than 5% voltage drop for the coils to drop out. Take the contactors apart, sand the metal faces of the iron with emory cloth and apply a light coat of machine oil. If this doesn't stop the chatter replace the contactors.
RE: DeviceNet
This may help for further discussions; Originally the baud rate was set for 250. The one starter that drops out more frequently, before the change, was dropping out 4or 5 times a day/night. Then the rate was changed to 125, and now it is only once in awhile. I'm trying to find the network topology so in the next shut down I can really go over this troublesome section.
Voltage drop is not suspect.
And a further FYI, everything at some point has been changed out in that cell. From the starter to the poni to the line drop and the multiport brick. I don't think it is physical. It is something within the Delta V or DeviceNet. I will talk to our Administrator about your first suggestion gristlehead, thanks.
RE: DeviceNet
RE: DeviceNet