Encoder Fault Codes - Siemens SINAMICS CU240S DP-F Operating Instructions Manual

Commissioning
5.8 Commissioning the Encoder
5.8.2

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 r0949:
r0949 = 1 - Encoder loss detected due to sudden speed change (i.e. speed change detected
on the encoder in a single scan > value in P0492).
r0949 = 2 - Encoder signal lost whilst running at low speed.
r0949 = 7 - Encoder loss detected due to motor stalled.
Optimum signal clarity is achieved when differential wiring is used between the encoder
and encoder module. This is especially useful when situated in a noisy environment or with
long cables – however, the module will function correctly both with single ended or
differential wiring and as such can tolerate a wire break when differential wiring is used. If
the module loses the complete signal on either A or B lines, the inverter will report F0090.
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.
108
CAUTION
SLVC mode (P1300 = 20 or 22).
encoder feedback signal using r0061). Check for correct magnitude and direction of
speed.
Operating Instructions, 07/2008 - FW 3.2, A5E00766042B AD
Control Units CU240S