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MICROMASTER

Maximum Torque setting on a SED2 (MM430)

Thread Starter: NAS_fac   Started: 1/28/2009 8:44 PM   Replies: 2

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  1/28/2009, 8:44 PM
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I have an issue where we are replacing existing GE AF300E$ on some chilled water pump motors. 
There was a torque setting on the GE drives that was set down to 86%. I believe this was done because of the excessive load on the motor causing over current. The GE drive operates fine and the current seems to stay below motor nameplate (28.7A) 

I purchased Siemens SED2 drives to replace these, and there does not seem to be a parameter that can be set to limit the torque produced. Under the direction of tech support...I have tried adjusting some settings... boost, linear V/f, etc. But the motor accelerates to about 46Hz then hits A501 (current limit) and will not continue. There are some torque settings P1500 - 1525 but I can't find any documentation that covers these. 

Thanks     






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  2/2/2009, 12:12 PM
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A MM430 Parameterlist you will find at:http://support.automation.siemens.com/WW/view/en/24479411
(the MM430 is the “parallel Inverter of the SED 2) 

Please use P1300 =
3 V/f with programmable characteristic

Mit freundlichem Gruß / Best regards

Jens S
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  2/5/2009, 7:01 PM
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JensS,
Thank's for the reply. I assume that raising the voltage / Hz will reduce the current at a given frequency.

Any thoughts on what values would be needed to limit the torque to about 86% at 60Hz? Should the curve still be linear? Should I maintain a certain V / Hz value along the entire curve? If I have a drive supply say 300 V at 15 Hz, or 400 V at 15 Hz, will it cause any damage?

Thanks,
Scott

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