-7-
Troubleshooting Guide
Trouble
Possible Cause
Remedy
a. No power to amplifier
a. Restore power
b. Amplifier is defective
b. Replace amplifier
c. Amplifier is in Loss of Signal mode
(Red LOS LED is on)
c. Restore command signal
d. Actuator/amplifier is wired
incorrectly
d. Correct per wiring diagram furnished
with unit
e. Amplifier deadband is too wide
e. Reduce deadband setting
f. Dip Switches not properly set
f. Set Dip Switches per Dip Switch table
a. Zero and span pots not properly adjusted
a. Adjust per set-up and calibration
instructions
b. Actuator position limit switch activated
b. Limit switches must be set to trip just
outside of zero and span set points
c. Dip Switches not properly set
c. Set Dip Switches per Dip Switch Table
d. Actuator torque or thrust limit switch
activated
d. Determine cause for overload and correct
a. Deadband is too narrow
a. Increase deadband setting
b. Command signal is too noisy
b. Command signal wiring must be shielded
with shield grounded at source common only
a. Speed pot not properly adjusted
a. Adjust speed pot as required but not faster
than catalog ratings
b. Bal pot needs adjustment
b. Adjust Bal pot as required
a. Input voltage selector switch not in
correct position
a. Correct position as required
b. 180 Vdc actuators must have 240 Vac
input to amplifier
b. Insure proper power supply is available
c. Amplifier output voltage jumper selector
in wrong position
c. Correct jumper position
a. Mechanical binding in actuator or driven
load
a. Repair/replace as needed
b. Inadequate voltage to actuator
b. Refer to installation wiring and set-up &
calibration procedures in this manual
Amplifier burned up at power-up
a. Power connected to wrong terminals
a. Replace amplifier and wire per wiring diagram
furnished with equipment.
a. Incorrect external wiring.
a. Make sure power supply is in sequence with
transmitter.
b. Incorrect external power supply.
b. Measure power supply output volatage.
No 4- 20 mA output
Amplifier output voltage does not match
actuator nameplate voltage
Actuator does not pull load
Motor does not operate
Actuator does not go full stroke
Yellow and Green LEDs stay on around
null or at null
Actuator stroking speed is too fast or too
slow for application in one or both
directions
