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ACT2000
2-9
If any of the health parameters are out of the normal operating range, the MCE
outputs a discrete FAULT alarm to the user’s controller. The actuator firmware
also captures the fault data in the EEPROM.
If the motor or electronics temperature is above the normal operation range, the
MCE outputs a separate OVERTEMP alarm. The actuator firmware also captures
the fault data in the EEPROM.
If any of these faults have occurred, the user should shut down the ACT2000 to
investigate the failure cause
If the ACT2000 is operational, a fault file can be uploaded using ActWiz software
via the RS232 interface. The fault file will provide fault information and possible
cause.
2.5 FAULT Alarm
The FAULT alarm is a discrete output from the ACT2000. The FAULT circuit is
CLOSED in the normal operating condition.
During normal operation, the ACT2000 monitors system health. If the ACT2000
detects a fault, the FAULT circuit OPENS and fault records in the fault file. The
user-provided controller should detect the OPEN circuit.
Should a FAULT occur, the user should shut down to troubleshoot the failure.
Removing 120 VDC power shuts down the ACT2000. Toggling the RESET
command will clear the FAULT alarm, but it does NOT clear the fault file.
The following faults are recorded:
Driver over-current
The maximum MCE current output limit is 25 amps. If the MCE is outputting its
maximum current for ten (10) seconds, the MCE signals a FAULT.
Should MCE maximum current drop below the maximum current, the FAULT
signal is cleared.
Tracking error
The ACT2000 position should continuously track demand. Should the position
versus demand vary more than one motor revolution (0.20 inches) for more
than ten (10) seconds, the MCE signals a FAULT.
Should the position return to within one motor revolution, the FAULT signal is
cleared.
Watchdog expired
The MCE watchdog timer continuously monitors the firmware program. Should
the MCE firmware program stop functioning, or attempt to access an illegal
address, the MCE signals a FAULT.
This FAULT does not clear without RESET command.
Resolver to Digital Converter (RDC) failure
The MCE contains a resolver to digital converter chip (RDC) that provides
position feedback information to the DSP. The RDC chip has on-board health
monitoring.
Should the RDC detect an internal tracking error, a signal is sent to the MCE.
Upon receipt, the MCE signals a FAULT.