dc boost/ ir comp
dc boost/ ir comp
(OP)
Hi, is there a rule of thumb for the maximum amount of IR comp that can be used without risk of burning out the motor windings. i am having trouble with some 240v three phase motors that run for prolonged periods of time at freuencies as low as 3hz. They have been in service for some time and occasionally tend to stall, i was thinking of tweaking the IR comp setting up a bit it is currently set to 12v what would be a resonable maximum and what is the rule of thumb for working this out. I need to be quite cautious because we are talking about 48 motors so i would not want to change settings that cause problems on all of them.
The motors have no forced ventalation they are cooled by the shaft mounted fan.
could i just increase the ir comp and then measure the temperature of the motor over a period of time. Would this prove that i am not likely to have problems?
The motors have no forced ventalation they are cooled by the shaft mounted fan.
could i just increase the ir comp and then measure the temperature of the motor over a period of time. Would this prove that i am not likely to have problems?





RE: dc boost/ ir comp
respectfully
RE: dc boost/ ir comp
Doing this increases the starting torque 50%, increases the motor speed compared to the machine speed 50%, drops the torque the motor sees 50% and significantly improves cooling.
I am assuming that max speed on the load is 50 or 60hz on the motor. You will not hurt the motor doing this as long as it is a four or six pole motor. If it is two pole, I would only go to 75hz.
Good luck.
RE: dc boost/ ir comp
Set the drive to display motor current and see what it is.
Increase the low RPM boost so you see a 10% current increase.
Check the motor temperature.
RE: dc boost/ ir comp
RE: dc boost/ ir comp
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com