ACS800 Drive start and current issues
We have recently replaced a fan motor controlled by an ACS800 in DTC mode, when it was finished we had some problems starting it, the current peaked at the limit and stopped the drive after the alarm delay triggered.
We managed to get it running by starting it locally at a fixed rpm and then switching over to remote control.
We have eight fans in a cooling tower and when I looked at trend curves I could see that three of them are running with a current consumption approx. 20 - 50 % higher than the others.
While reviewing workorders I noticed that all three higher consuming motors have been replaced in the last year so I suspect that there is something in the configuration that has to be altered.
I cannot find anything in the manuals about actions to take when replacing motors, they have the same data but perhaps they need a new ID check?
Can I run a new ID magnetising? The manual only mentions that it is performed during commisioning.
If so, does the motor have to be in standstill? I would need to shut down all fans in this case as they influence eachother and this would have to be performed during stopped production.
I would prefer not to do a complete ID run in order to avoid decoupling the fan and gearbox.
Or could it be something else? I have checked the parameters on the drive and they all match.
if you have substitute the old motor with one new but with a difference, you need one new ID RUN in the drive.
You can use the id magn mode, the drive perform the ID of the motor at the first start, during 20 - 60 sec.
Make sure to input in parameter group 99 every info about the motor, such current, rpm, kw and so.
If you can perform ID run WITHOUT load, of course the drive give you the best performance.
Hope this help you