12/17/2018 6:39 AM | |
Joined: 8/7/2017 Last visit: 3/1/2023 Posts: 14 Rating: (0) |
Hello everyone, I am facing an issue with Servo motor 1FK7064-7AH71-1SG0. In our process, we are using a master encoder which is mechanically coupled to the shaft of main motor. This master encoder is giving reference point to servo. Servo runs in sync with the main motor of machine. While, normally Servo is Homed and Geared In(both when machine running and while machine is standby) but in one case/process servo need to Gear Out and again Gear In automatically through program. In another case we do it manually by using a button in HMI. In that particular process when program gives command of 'Gear In' in zero motion of the main motor/shaft it starts rotating continuously until we reset the power of Active Line module or some times it itself stop at reference degree of the master encoder after taking one or two rounds. It rotates CW or sometimes CCW. Importantly, this doesn't happens every time, it is not consistent issue. Many a times it works fine, perfectly normal. When frequency of this issue increased we bypassed automatic Gear In and Gear Out process. Meant to say we made it continuously Geared In through program so it was not moving. But, still we are facing this same issue when we Gear In manually through HMI in some other process. This is also not very frequent, many times it works fine. HMI have degree display of both two encoders 1) Master encoder and 2) Follower encoder(resolver) inside servo. And another third one is 3) Master encoder of Main motor/crankshaft. These two master encoders Number 1 and Number 3 are also mechanically coupled to the main motor/crankshaft. Encoder number 3 is used for other purpose in machine. Hardware details: PLC CPU: 315T DP S7-300 Servo make : Siemens 1FK7064-7AH71-1SG0 synchronous motor. Speed 4500rpm. Torque 5Nm. Amps 7 Servo topology: S120_CU320_2_DP >Active interface module> Active line module > Single motor module. Profidrive telegram: SIEMENS telegram 106, PZD-11/15 Encoder: Absolute. 8192x1. 10-30VDC. Driver-SSI Grey Master SSI encoder of servo is connected to SMC30 Follower encoder(resolver) inside servo is connected to SMC10 (Both SMC30 and SMC10 are connected through CLiQ to Single motor module) Communications : Profibus DP and CliQ What we did: 1) We separated all the power cables and communication cables up to a safe distance. 2) Tried changing SMC30, SMC10, Servo motor, Encoders, Single motor module, Power cable of servo, feedback cable of servo follower encoder(resolver), cable of servo master encoder. Observations: (Don't know if this is the reason) Waiting for your valuable feedback. Thanks AttachmentServo.zip (241 Downloads) |
12/17/2018 4:06 PM | |
Joined: 10/11/2006 Last visit: 9/18/2024 Posts: 5906 Rating: (804)
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Hello, use the trace tool to analyse your behavior. 8.7 Using the TraceTool for testing https://support.industry.siemens.com/cs/ww/en/view/30119663 |
With best regards, |
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12/23/2018 7:50 PM | |
Joined: 8/7/2017 Last visit: 3/1/2023 Posts: 14 Rating: (0) |
Thanks for your reply. I was not around so accept my apologies for the delay. As suggested by you i reached device trace. Can you let me know what value i have to trace ? Attached herewith screenshot of my screen. |
12/27/2018 11:07 AM | |
Joined: 10/11/2006 Last visit: 9/18/2024 Posts: 5906 Rating: (804)
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Dear Targaryen, I would trace speed setpoints (actual values) and control word verifying where they are coming from when your undesired behavior occures. (PLC, Basic Positioner,...) Most important is to know who is sending undesired setpoints. Knowing that you need to investigate in the WHY. TRACE is a powerful tool verifying all signals. Function Diagrams (google for "List manual": https://support.industry.siemens.com/cs/ww/de/view/109760366) or even the STARTER Pages give you an idea of signal flow. Following this paths back you may find the source of problems. Good luck! |
With best regards, |
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8/28/2019 8:51 PM | |
Joined: 8/7/2017 Last visit: 3/1/2023 Posts: 14 Rating: (0) |
Thanks Technology Team, Anyone reading this post we have fixed this issue, posting this after a long time because i was observing it. To overcome this problem we have inserted heat shrink tube on the jaws of coupling in order to reduce the gap and make the coupling tighter than earlier. From last 3 months we haven't faced any issue with the servo rotation. Thank you.
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