ABB ACSM1 - Page 321

Fault tracing
321
0039 ENCODER1
(0x7301)
Encoder 1 feedback fault If fault appears during first start-up before
encoder feedback is used:
- Check cable between encoder and encoder
interface module (FEN-xx) and order of
connector signal wires at both ends of cable.
If absolute encoder, EnDat/Hiperface/SSI,
with incremental sin/cos pulses is used,
incorrect wiring can be located as follows:
Disable serial link (zero position) by setting
parameter 91.02 ABS ENC INTERF to (0)
None and test encoder operation:
- If encoder fault is not activated, check serial
link data wiring. Note that zero position is not
taken into account when serial link is
disabled.
- If encoder fault is activated, check serial link
and sin/cos signal wiring.
Note: Because only zero position is
requested through serial link and during run,
position is updated according to sin/cos
pulses.
- Check encoder parameter settings.
If fault appears after encoder feedback has
already been used or during drive run:
- Check that encoder connection wiring or
encoder is not damaged.
- Check that encoder interface module (FEN-
xx) connection or module is not damaged.
- Check earthings (when disturbances are
detected in communication between encoder
interface module and encoder).
Note: The new settings (or fixed wiring) will
only take effect after parameter 90.10 ENC
PAR REFRESH is used or after the JCU
control unit is powered up the next time.
For more information on encoders, see
parameter groups 90 (page 256), 91 (page
260), 92 (page 266) and 93 (page 267).
Code Fault
(fieldbus code)
Cause What to do