Siemens CU240S DP Operations Instructions download pdf (Page 79)

Commissioning (software)

2.8 Encoder Commissioning

Control Units CU240S

Operating Instructions (Compact), 04/2006, A5E00766042B AA

2-59

2.8.3 Encoder fault codes

Encoder fault codes

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:

8. Check that an encoder is fitted. If the encoder is not fitted, set P0400 = 0 and select

SLVC mode (P1300 = 20 or 22).

9. Check the connections between the encoder and the inverter.

10. Check the encoder is not faulty (select P1300 = 0 and run at a fixed speed then check the

encoder feedback signal using r0061). Check for correct magnitude and direction of

speed.

11. Increase the encoder loss threshold in P0492.

12. Increase encoder low speed loss detection delay in P0494.

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Siemens CU240S DP Operations Instructions Page 79