Curtiss-Wright | EL30 Rev. H PN23942 6/14/16
14
6.0 TROUBLESHOOTING PROCEDURES
Symptom /
Trouble
Possible Cause / Troubleshooting Procedure
No response from
actuator.
1. Check amplifier for faults that may indicate problem.
2. Check to insure that amplifier is enabled.
3. Check for proper wiring.
Actuator seems to
be enabled
(receiving current)
but is not
operating or is
operating
erratically.
1. Amplifier may be improperly tuned. Check all gain settings.
If a motor file or parameters specific to your amplifier/actuator
combination have been supplied by Exlar, be sure that they are
entered or downloaded properly.
2. Amplifier may be set up improperly for the particular motor being
used. Check amplifier settings for number of poles, voltage,
current, resistance, inductance, inertia, etc.
3. Feedback wiring may be incorrect.
4. Feedback conductors are touching, or feedback cable may be
damaged.
5. Motor phases are wired incorrectly or in incorrect order. (R,S,T).
6. Feedback (resolver or encoder) is improperly aligned. Contact
Exlar.
Actuator cannot
move load.
1. Load is too large for the capacity of the actuator or too much
friction is present.
2. Excessive side load.
3. Misalignment of output rod to load.
4. Amplifier has too low of current capacity or is limited to too low of
current capacity.
Actuator housing
moves or vibrates
when shaft is in
motion.
1. Check actuator mounting. Insure that the actuator is securely
mounted.
2. Amplifier is improperly tuned (wrong gain settings.) Tune amplifier.
Output rod rotates
during motion and
thus does not
provide proper
linear motion.
1. Install Exlar anti-rotation assembly or incorporate anti-rotation
into the application.
Limit switches not
functioning.
1. Limit switches wired improperly. Refer to manual.
2. The device being driven by the limit switches is not compatible
with the electrical output of the limit switch. Check device
requirements.
3. Switches have been damaged by improper wiring or improper
voltage applied. Replace switches.
Brake does not
hold load in place.
1. Load is larger than the capacity of the brake.
-check load level against actuator rating
-oil lubricated units reduce holding capacity of the brake
2. Brake is not engaged. (Power is not removed, or only partially
removed from brake).
3. Brake is being used as other than a power loss holding brake.
Actuator is
overheating.
1. Insufficient cooling for application requirements. See oil cooling
section of this manual or main catalog or contact Exlar engineering.
2. Actuator is being operated outside of continuous ratings.
3. Amplifier is poorly tuned causing excessive unnecessary current
to be applied to motor. Check Gain settings.
