We are in the process of choo
We are in the process of choo
(OP)
We are in the process of choosing the control power supply for motors. Our client is a Eroupen company which dictates the applications. They object use of control transformer and want to use ac or dc ups for motor control power. They want to make sure the control power is always available to enable the motors reaccelrating if the power outages revovers within 0.5s. My concerns are, if there are so many motors recelerating simutaneously, large voltage dips may occur which may bring the system voltage further down and shutdown the whole plant. I don't have any operation experience with this applications. I appreciate it for any inputs.





RE: We are in the process of choo
RE: We are in the process of choo
Conventional wisdom is to either use manual starting after an outage, or if starting is automatic, a time delay may be programmed so that all motors have enough time to slow down and the back EMF may decay to a safe level.
The next step may well be to get your legal advisers to prepare ironclad disclaimers to go with this one.
I seem to remember this being discussed here at other times so you may want to spend a few minutes searching this site.
PS. Where are you located these days?
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: We are in the process of choo
RE: We are in the process of choo
RE: We are in the process of choo
I think this comes from the European concept of a "reclosing device" which dependng on the length of the power outage will issue a command to the control system and the control system will restart selected motors that are essential to the safe operation of the equipment. Not all motors have to be restarted.
RE: We are in the process of choo
RE: We are in the process of choo
Bill
--------------------
"Why not the best?"
Jimmy Carter