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38
Fault Indication & Control Status
Publication 4100-5.2 - March 2000
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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.
Transducer Faults and Causes
Fault
Configuration error
SSI Line Break
SSI Time-out
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.
Fault
Incremental Strobe Loss
Absolute Strobe Loss
Strobe Timing Violations
In the case of an incremental strobe loss or move error, sending an
Absolute Home command may reset the fault.
Transducer Faults
Possible Cause
Configuration switches are set to an
illegal combination
AEC detected loss of data signal. This is
the normal state for an unused SSI.
Transducer position not received after
100ms.
Encoder Faults
Encoder Faults & Causes
Possible Cause
The AEC is in locked mode & stopped
receiving incremental strobe pulses.
AEC did not receive the second
absolute strobe pulse in time.
Incremental or Absolute strobe
update timing has been violated.
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