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armature current flactuation

8/21/2010 8:00 AM	Rate (0)
mostafa Posts: 4 Rating: (0)	Hi dear experts I have a big 1-Q Simoreg ,6RA7097-4KS22( 2800A- 750V) It has a small 4_Q Simoreg for it's field. I did all settings for configuring the small one as field unit, but at the end, when operating the main drive(the big one) armature current has a flactuation by about 5%. It should be mentioned that when i do the optimization run for field weakening in main Simoreg(the big one) by P51=27, I get fault 50 with r047=9 with this explanation: Field current control loop is not stable enough to record field characteristics (30s after injection of internal field current setpoint, actual field current is deviating by more than (0.39% of P102 + 0.15 % of r073.002) from the setpoint) Possible cause: • Field current controller or field current precontrol is not optimized or optimized badly (check P112, P253 to P256 or execute a current controller optimization run (P051=25)) but i did P051=25 succesfully!!! what is your idea????
mostafa Posts: 4 Rating: (0)
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8/23/2010 5:51 AM	Rate (0)
KSN Diamond Expert Joined: 8/25/2006 Last visit: 1/16/2026 Posts: 2221 Rating: (282)	Hello. How your drives are connected together? How The small drive receive field current setpoint? Look at this manual for using simoreg as field supply unit.

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