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Sinamics V90 Homing mode = 7 problem (position lost )

Created by: FM_Merse1 at: 11/16/2022 11:02 PM (4 Replies)

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11/16/2022 11:02 PM	Rate (0)
FM_Merse1 Bronze Member Joined: 10/31/2013 Last visit: 12/2/2024 Posts: 77 Rating: (1)	Please help.. I have 5 x V90 servo motors 400V + absolute encoder (20 bit + 12 multiturn) and the same problem appears on each one. All settings are in the picture. -When referencing in mode 7, the PLC sets Actual position to 0.0 and in StatusSensor[1].AbsEncoderOffset sets the current position where the encoder was. Tag Axis. Homed goes to "1". -After shutting down the PLC, Actual position goes to the value that was in StatusSensor[1].AbsEncoderOffset and resets Axis Homed every time.StatusSensor[1]. AbsEncoderOffset set to 0.0. - After moving the motor and shutting it down again, the PLC remembers the previous position. So, when I do homing in mode 7 and reset the PLC first time: Actual Position = StatusSensor[1].AbsEncoderOffset StatusSensor[1].AbsEncoderOffset =0.0 Axis. Homed =0. I move the motor in jog mode from some position and everything is ok. I turn off the PLC again, it remembers the previus position. And of course I do Save ram to rom in V Assistant . Are there any other settings that need to be made in V Assistant? Best regards Attachment V90.jpg (716 Downloads)

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11/16/2022 11:07 PM	Rate (0)
FM_Merse1 Bronze Member Joined: 10/31/2013 Last visit: 12/2/2024 Posts: 77 Rating: (1)	Link for complete PLC program TIA v16 from wetransfer: [snip] More information : -PLC S7 1215 v4.4 -i try with another new 1215 PLC -i try serveral time factory reset of V90 ... Attachment SERVO.zip (722 Downloads)
	Last edited by: FM_Merse1 at: 11/17/2022 07:08:55 Last edited by: Jen_Moderator at: 11/17/2022 08:38:44 Link removed and file added as zip file.
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11/18/2022 7:32 AM	Rate (0)
Martin472 Bronze Member Joined: 4/28/2009 Last visit: 9/16/2024 Posts: 347 Rating: (43)	Hello, for multiturn encoder you have to choose Cyclic absolute instead Rotary absolute in encoder configuration. Rotary absolute is for singleturn encoders. With regards Martin

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11/18/2022 7:50 AM	Rate (0)
FM_Merse1 Bronze Member Joined: 10/31/2013 Last visit: 12/2/2024 Posts: 77 Rating: (1)	Hello, As far as I know, it is only possible to select it for the S71500, but not for the S7 1200 ? Best regards

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11/21/2022 2:31 PM	Rate (0)
Technology Team Platinum Expert Joined: 10/11/2006 Last visit: 12/2/2024 Posts: 5953 Rating: (819)	Hello, TO of S7-1200 has no position tracking. When moving range is bigger ( >) than range of absolute encoder, you will get an overflow and TO doesn't realize it after Power Off/ON. Then position is wrong. When you need this function, a S7-1500 would be an option.
	With best regards, Technology Team Application consulting and pre sales support for SINAMICS, SIMATIC Technology, SIMOTION, SIMOTICS and MOTION CONNECT
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This contribution was helpful to 1 thankful Users Martin472

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