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Sensorless Vector on S120

Created by: Wild Bull at: 11/21/2013 2:28 PM (6 Replies)

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11/21/2013 2:28 PM	Rate (0)
Wild Bull Posts: 30 Rating: (1)	We have a constant load application where there is a high starting load. We are running in Volts/Hertz with FCC p1300=1 with slip compenstation. Tried using p1300=20 but get a motor stall fault. The MasterDrives did sensorless vector very well. I have tried more than 20 drives and motors with the G120 and S120. I cannot get the drives to tune and run if there a load on the motor on startup. We replaced eight MasterDrives (sensorless vector) with Sinamics and none of them would tune and run. We ended up using p1300=1. Two other engineers have had the same experiance. What is everyone elses experiance?
Wild Bull Posts: 30 Rating: (1)
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11/21/2013 9:50 PM	Rate (0)
zako_ Gold Member Joined: 5/22/2012 Last visit: 3/24/2022 Posts: 895 Rating: (67)	... which Fírmware do you use?

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11/22/2013 2:19 PM	Rate (0)
Wild Bull Posts: 30 Rating: (1)	V04.50.30.09 r18=4503009 CU320-2 DP 6SL30401MA00-0AA0 Qty 3
Wild Bull Posts: 30 Rating: (1)
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11/22/2013 2:35 PM	Rate (0)
Wild Bull Posts: 30 Rating: (1)	p1300=1 with the slip compensation turned on works well. BUT can not use load sharing if the Master is in Volts/Hertz. The Master's actual torque value r80[0] is used as the torque setpoint p1503 for the slave drive. r80[0] has a value in Volts/Hertz but is not valid and it will not work. We are pulling encoder cable to the Master motor today.
Wild Bull Posts: 30 Rating: (1)
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11/24/2013 9:37 PM	Rate (0)
zako_ Gold Member Joined: 5/22/2012 Last visit: 3/24/2022 Posts: 895 Rating: (67)	Hello, noramally the stationary and rotary measurement should be sufficient. Or did you use other motor types compared to MASTERDRIVES. Zako

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11/25/2013 6:40 PM	Rate (0)
Wild Bull Posts: 30 Rating: (1)	My experiance is that sensorless vector is harder to tune with a S120 than the MasterDrive. Often the tune will fail to determine the motor moment of inertia (p341). In those cases I have to contact the manufacture to get the inertia. BUT When p1300= 20, the drive is in Volts/Hertz mode until it reaches the change-over frequency which is around 6 Hertz. I am getting a motor stall fault on startup when it is still in Volts/Hertz mode. When p1300=1, I can set boost values p1310, p1311, & p1312. The motor work fine. When I change to SLVC the drive IGNORES my boost setting and the motor stalls. The S120 firmware needs to have a way to force the drive to use the boost setting when in Volts/Hertz.
Wild Bull Posts: 30 Rating: (1)
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2/20/2014 1:53 PM	Rate (0)
Wild Bull Posts: 30 Rating: (1)	This is still a problem. I have some MasterDrives I would like to replace. But I can't. The motors are at a location where they get a high-pressure washdown. Encoders cannot handle the high pressure water. The SINAMICS drives will fault on startup when in sensorless vector mode. I must keep the old MasterDrives because the S120 will not work. I have been complaining to Siemens for over four years. Siemens has not found a solution.
Wild Bull Posts: 30 Rating: (1)
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