Rockwell Automation 4100 AEC Absolute Encoder Converter Installation - Manual (Page 46)

Publication 4100-UM052B-EN-P - October 2001
38 Fault Indication & Control Status
Transducer Faults
Transducer faults detected by the AEC are indicated by a flashing RED
LED for the offending axis. In a fault condition, the quadrature output
is inhibited and the fault relay is de-energized. The following table
displays a list of probable causes to investigate.
Encoder Faults
Encoder faults are strobe cycle errors. The strobe is an input to the
AEC through the Encoder connector. When detected by the AEC, the
offending axis’s LED alternately flashes RED-GREEN. This causes the
quadrature output to default to free-running mode and the fault relay
is de-energized. The following table lists faults and possible causes
when Encoder faults are indicated.
In the case of an incremental strobe loss or move error, sending an
Absolute Home command may reset the fault.
Transducer Faults
Transducer Faults and Causes
Fault Possible Cause
Configuration error Configuration switches are set to an
illegal combination.
SSI Line Break AEC detected loss of data signal. This is
the normal state for an unused SSI.
SSI Time-out Transducer position not received after
100ms.
Encoder Faults
Encoder Faults & Causes
Fault Possible Cause
Incremental Strobe Loss The AEC is in locked mode & stopped
receiving incremental strobe pulses.
Absolute Strobe Loss AEC did not receive the second
absolute strobe pulse in time.
Strobe Timing Violations Incremental or Absolute strobe
update timing has been violated.