Hamilton Sundstrand Company ACT2000 - Manual (Page 57)

Symptom Probable Causes Corrective Action
FAULT alarm Various Upload Fault File to identify source of fault
OVER TEMP alarm Ambient temperature limit
exceeded
Electronics or motor winding
temperature out of range Allow actuator to cool and re-start
Reduce ambient temperature
Check for jammed extension rod
FAULT and OVERTEMP
alarm No 120 VDC Power
DSP Failure Ensure 120 VDC at actuator
Contact factory
Table 5-2. ACT2000 In-Service Troubleshooting Chart
For troubleshooting purposes, use Table 5-3 to verify the actuator
electrical continuity integrity.
Disconnect the ACT2000 power and digital harness connectors and use a
digital multi-meter (DMM) to check the resistance values between the
wires indicated on the table. If an open circuit is detected, send the
ACT2000 to Precision Engine Controls Corporation for test and repair.
WARNING – Shock Hazard
Remove all power to the ACT2000 prior to continuity check.
Function Actuator Wire Colors Resistance Value
DEMAND BRN and WHT/BRN 225 Ω
RUN VIO and WHT/VIO 4.7 K Ω
RESET GRY and WHT/GRY 4.7 K Ω
POWER RED and GREEN High Impedance, but
not open circuit.
MOTOR CURRENT BLU and WHT/BLU High Impedance
POSITION YEL and WHT/YEL High Impedance
FAULT Alarm ORN and WHT/ORN High Impedance
OVERTEMP Alarm BLK and WHT/BLK High Impedance
Table 5-3. ACT2000 Electrical Continuity Troubleshooting Chart
CH. 4: TROUBLESHOOTING THE ACT2000 51