DTC
DTC
(OP)
Hi,
I just installed one 1500 A ACS800 drive. It`s running on DTC control mode and the motor is drawing excessive current at half nominal speed. Another drive of different make hardly drew 60 % nominal current at that particular speed. The ACS drive drew around nominal current at that speed. I am not too familiar with the ABB drive and would like to have comments from memebers of the forum.
Thanks.
Grundig
I just installed one 1500 A ACS800 drive. It`s running on DTC control mode and the motor is drawing excessive current at half nominal speed. Another drive of different make hardly drew 60 % nominal current at that particular speed. The ACS drive drew around nominal current at that speed. I am not too familiar with the ABB drive and would like to have comments from memebers of the forum.
Thanks.
Grundig





RE: DTC
RE: DTC
In any case, the drive is configured as ID Mag that is each time a start command is given, the drive will magnetise the motor to develop the model.
Grundig
RE: DTC
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: DTC
RE: DTC
When you use the ID Magn, it only builds its model on the first start. It does not redo it on every subsequent start.
This does definitely sound like a motor data error. Usually, the ID Run will not finish with wrong data but occasionally it can be fooled.
RE: DTC
Is everything running freely with the load?
Is the ACS800 going into current limit? your description of excessive current would actually be excessive if the drive is going into current limit. Is there an alarm/warning coming up on the drive's display?
I would agree with previous posters, it is generally a parameter setting issue but it would pay to check the above as well.
Is the current 'excessive' when you go from start to half speed or when you go from full speed to half? If the latter, what is the current like at full speed?
RE: DTC
Thanks all for the inputs. The motor data are correctly entered. It is also worth mentioning that the previous drive was a variable torque one. I am in touch with the ABB people and shall keep all informed.
Thanks again.
Grundig
RE: DTC
This may be a case that we can all learn from.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: DTC
Seems a little odd to be using an ACS800 with DTC control.
What about setting the ACS800 to VT setting? see if this makes any difference.
RE: DTC
Another thought. In DTC mode, the Group 23 gains need to be set to make the speed loop operate correctly. I would like the OP to advise his settings in Group 23.
RE: DTC
The OP siad it was 1500Amp drive, at 400V that's about 1000kVA, that's why ACS800.
RE: DTC
Roy
RE: DTC
May be this is the case in your case too.
RE: DTC
I just wondered why DTC setting and not V/F (scalar), not the fact the ACS800 is used.
RE: DTC