Troubleshooting For Encoders - Siemens SINAMICS S120 Commissioning Manual

Explanations of the alarm classes
● Alarm class A: Drive operation currently not limited
● Alarm class B: Time-limited operation
● Alarm class C: Functionally limited operation
3.6

Troubleshooting for encoders

If an encoder fault is present, it can be acknowledged separately according to encoder
channels in a PROFIdrive telegram via the encoder interface (Gn_STW.15) or the drive
interface of the appropriate drive object.
Sample configuration: 2-encoder system
● Encoder G1 motor measurement system
● Encoder G2 direct measurement system
Case considered:
All encoders signal encoder faults.
● The errors are entered in the encoder interface - and from there into the encoder channel
● The faults are transferred to the drive object.
Commissioning Manual
Commissioning Manual, (IH1), 01/2012, 6SL3097-4AF00-0BP2
– e.g. alarm when measurement systems inactive
– no limitation on current movement
– Prevent possible switching to the defective measuring system
– e.g. prewarning temperature: without further action the drive may need to be switched
off
– After a timer stage -> additional fault
– after exceeding a switch-off threshold -> additional fault
– e.g. reduced voltage/current/torque/speed limits (i2t)
– e.g. continue with reduced accuracy / resolution
– e.g. continue without encoder
n of the PROFIDRIVE telegram. Bit15 of the encoder status word (Gn_ZSW.15 = 1).
Diagnostics
3.6 Troubleshooting for encoders
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