Encoder Fault Codes - Siemens SINAMICS G120 Operating Instructions Manual

Commissioning (software)
5.10 Encoder Commissioning
5.10.2

Encoder fault codes

Description
The Encoder Interface has only one fault code, – F0090. This condition occurs when the
allowed frequency rate of change, set in P0492[3] is exceeded or when low speed encoder
loss is detected.
Note
The reason for the encoder loss will be given in the level 3 parameter P0949:
P0949 = 1 means encoder loss of channel A or channel B or channel A and channel B at
high speed (shaft speed > P0492)
P0949 = 2 means encoder loss of channel A or channel A and channel B at low speed
(shaft < P0492)
P0949 = 7 means excessive flux variance which may cause motor instability - possible due
to encoder loss.
Remedial action on fault condition
Should the encoder give a fault message F0090 the following remedial action should be
performed:
1. Check that an encoder is fitted. If the encoder is not fitted, set P0400 = 0 and select
2. Check the connections between the encoder and the inverter.
3. Check the encoder is not faulty (select P1300 = 0 and run at a fixed speed then check the
4. Increase the encoder loss threshold in P0492.
5. Increase encoder low speed loss detection delay in P0494.
5-114
SLVC mode (P1300 = 20 or 22).
encoder feedback signal using r0061). Check for correct magnitude and direction of
speed.
Operating Instructions, 11/2006, A5E00766042B AA
Control Units CU240S