Technical data

Diagnostics
3.6 Troubleshooting for encoders
Commissioning Manual
Commissioning Manual, (IH1), 01/2011, 6SL3097-4AF00-0BP1
235
Explanations of the alarm classes
● Alarm class A: Drive operation currently not limited
– e.g. alarm when measurement systems inactive
– no limitation on current movement
– Prevent possible switching to the defective measuring system
● Alarm class B: Time-limited operation
– 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
● Alarm class C: Functionally limited operation
– e.g. reduced voltage/current/torque/speed limits (i2t)
– e.g. continue with reduced accuracy / resolution
– e.g. continue without encoder
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 DO.
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
n of the PROFIDRIVE telegram. Bit15 of the encoder status word (Gn_ZSW.15 = 1).
● The faults are transferred to the drive DO.
● Motor measuring system faults set the drive DO to fault (ZSW1 bit3), the faults are
additionally signaled via the drive interface. An entry is made in fault buffer p0945. The
parameterized fault reaction is initiated internally.
● The direct measuring system faults are re-addressed as alarms via the appropriate drive
DO and signaled via the drive interface (ZSW1 bit7). An entry is made in alarm buffer
r2122.
No drive reactions are initiated.