Symptoms
Using HTL/TTL encoder, speed difference between multiple encoder sampling cycles exceeded P0492 value.
Possible Causes
- Encoder cable broken or plug loose
- Installation wiring non-compliant
- Electromagnetic interference on encoder cable
- Cable too long
Troubleshooting Steps
- Check encoder cable for breaks or loose plugs
- Verify drive and motor properly grounded, use 4-core cable (3 phase + PE)
- Ensure encoder cable shield properly grounded
- Keep encoder cable >20cm from power cables
- Check encoder cable length against maximum for communication rate
- Increase maximum speed difference per sampling cycle (P0492) if necessary
- First commissioning with encoder: set P1300=0 (V/F mode), run at constant frequency, check r0061 feedback speed matches given frequency
How to Reset
Reset by: 1) Correct the fault condition. 2) Press RESET button or send reset command via communication. 3) Verify fault does not recur during operation.
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Source: Siemens SINAMICS G120 Common Faults Manual (ad.siemens.com.cn)
Category: Electrical
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