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DC converters SIMOREG

SIMOREG F043

Thread Starter: SILOGIC   Started: 7/18/2011 7:32 PM   Replies: 3

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  7/18/2011, 7:32 PM
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We have a blank cutting line, which has been working through 2 years with one Simoreg 6RA7025-6DV62 connected by profibus and 4 old drives Contraves Brand.(No Communication, AI and AO).
This week, we changed the 4 older drives with 4 new Simoreg Drives, and keep the first Simoreg allready installed.
The problem we have is that we are communicating with the five drives with no problem, but in the allready installed drive we started to have an F043 fault, and we can't clear it.
It is strange, given it was working until the last week, and nothing changed in it.
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  7/19/2011, 7:31 AM
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Hello.
From the manual:

Possible fault causes
 - No “speed-dependent field weakening" (P081=0) is parameterized even though operation in the field weakening range is
needed for the requested maximum speed
Note:
In motor operation, it is possible to reach EMF values corresponding to the peak of the phase-to-phase supply voltage at a
firing angle of αG=30° (rectifier stability limit P150) and low armature currents.
 - Setpoint EMF for field weakening operation too high (parameter P101 is set too high)
 - Supply voltage dip
 - EMF controller or field current controller is not optimized, possibly resulting in excessive EMF on power-up

So, may be you have, e.g. voltage dip.

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  7/20/2011, 8:46 AM
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Please check following:
1.) Is the speed of the line higher as before the modernisation?
2.) Is field weakening enabled (P081=1)?
3.) Did you measure field current and compare with the setpoint? Is this correct?
4.) Do you have a correct field characteristic?
5.) Did you change speed normalization (of the production line) without new measurement of field characteristic (P51=27)?
6.) Did you change tacho without new measurement of field charachteristic?
7.) Did supply voltage change (lower as before)?

And at least a crazy idea: Is there a wrong wiring: Supply of the field of one motor comes from the field rectifier of a converter  for an other motor (we had this some years ago on a double head unwinder. As long as both drives were in operation everything was OK, but single operation of one drive was not possibel)?

good luck!



=== Edited by frimos @ 7/20/2011 8:50 AM [GMT ] ===


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  7/20/2011, 3:06 PM
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Thanks frimos,

I'snt that crazy the wiring theory, because if you have on the armature connected R, S, T you need to have in excitation R and T, otherwise, it could be a possible origin of fault.
In this case, itsn't seems to be the problem.
Yesterday we had in plant a Siemens Specialist, and, answering your questions, the motor doesn´t even starts. It gives the fautl with no movement.
We came back to factory defaults, configured it and tried Self-Tuning with no success.
At this point, we are thinking that it was broken and nobody realized that before, so we are going to send to check the motor (could be insulation problem, or anything else), and if the motor isn´t the problem, could be the driver. Best regards and Thanks.

Patricio Novotny
SILOGIC
Engineering and Automation

www.silogic.com.ar

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