8/3/2020 2:30 PM | ||
Joined: 7/7/2010 Last visit: 9/24/2024 Posts: 15225 Rating: (2417) |
Your project(s) has been running for years and suddenly you get alarm A31418? The encoder wiring may be failing (or failed) due to cable vibration or rubbing for example if the system has been in operation for a long time. It might be the encoder power supply is not powered up (blown fuse, tripped circuit breaker). It might be the encoder or its coupling is slipping. What is the value in p0492? What is the pulses per revolution for the encoder?
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science guy |
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8/4/2020 11:46 AM | |
Joined: 6/16/2015 Last visit: 9/20/2024 Posts: 29 Rating: (0) |
Many thanks. The problem was solved by rebooting CU320. The warning value was not saved. P492 = 50, P408 = 1024. Is a reboot really necessary to acknowledge this error? |
Last edited by: KirYan at: 08/04/2020 11:47:51the collective mind will prevail over common sense |
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9/11/2020 10:36 AM | |
Joined: 6/16/2015 Last visit: 9/20/2024 Posts: 29 Rating: (0) |
Hi experts. The problem arose again, with five converters at the same time. The warning is not acknowledged, I will reboot the СU 320. I recorded a signal from the encoder with an internal oscillograph and I do not see a problem with the encoder. What else can I do to solve this problem? What parameters can be checked or recorded on the oscilloscope? |
the collective mind will prevail over common sense |
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9/11/2020 4:19 PM | |
Joined: 7/7/2010 Last visit: 9/24/2024 Posts: 15225 Rating: (2417) |
Maybe it's my perception, but that encoder trace looks absolutely horrible, at least for an s120. I would expect actual speed to jump around on a G120, but not even like that. You have a problem with noise on your encoder. It could be a bad motor ground causing noise to feed back through the motor, shaft, encoder housing, onto the shield, and onto the signal. You can test that theory by using a standard multimeter - while starter is capturing the same encoder trace data (in real time so you can see it happen). Measure voltage from each encoder connection to ground while watching the trace. If the encoder trace suddenly gets smooth while measuring one of the connections, there is a noise / static build-up. This is not very engineering / scientific, but it does help pinpoint problems (so it is practical). As a test, use a spare encoder cable run outside wireways/troughs/trays/bundles directly from the encoder to the drive, with proper EMC connector & earthing of the shield on both ends. If the trace suddenly looks smooth, replace the original encoder cable, or at least run a new metal conduit for the encoder cable to route through.
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science guy |
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This contribution was helpful to2 thankful Users |
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