Pole position identification

Picture of the trace added

Jeff Casagrande

I had similar symptoms on a 1FT7 motor when the motor leads were reversed.  U, V and W must go to their respective terminals.  Something to check.

 In the past I also experienced on 1FT7 or 1FK7 that when the motorleads are reversed that you get F7900 at start of motion.
This is Lenze motor with resolver connected to SMC10. I already reversed the speed signal from the resolver (in Starter configuration) because of my past experience. But then the motor started in the other direction at a much higher speed then demanded and it couldn't be stopped with normal OFF1. So I suppose the original polarity is ok. The servomotor can run in U/F, so there may not be any mechanical obstacles.
The strange thing is that changing P431 does not change the relationship between r89 and r93.

 Kindly , did you solve this problem ? . . . 

DavidBrown

I have a Lenze servomotor with resolver I want to control from S120.
I performed the pole position identification (P1990=1,P1980=1,P1981=90).
But after succesfull executing the procedure, the motor won't start : fault 7900 : blocked, occurs, even when limits for time and torque are set higher.
The speed from the resolver is coming in ok, and the motor can rotate in U/F control (P1317=1).
Then I started looking at manual adjusting P431.For that I traced r89[0] and r93 while running in U/F.
I was told that where the sinus of r89[0] goes from the negative zone to 0, r93 should go from 360->0°.
But whatever value I put in P431, the relationship between r89[0] and r93 does not change at all.
And whatever value I put in P431, when starting (not in U/F) I keep getting F7900.
What could I be doing wrong?