Limitorque QX Electronic Actuator FCD LMENIM3306-06 – 07/14
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Troubleshooting
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WARNING: This actuator is non-intrusive. Do not open the control compartment on the actuator unless
absolutely necessary. It was sealed in dry, clean conditions in the factory and entry to this compartment should
not be necessary. Unauthorized entry could void the warranty.
If the actuator will not operate, before attempting to troubleshoot, verify the following:
• LCD display reads “XX% OPEN,” “STATUS OK.”
• Red selector switch is not in the STOP position.
• All three phases of the main power supply are present at the actuator terminals.
• The supply voltage is the same as that stated on the actuator nameplate.
• Optional 110 VAC is measured at terminals 23 and 24.
• 24 VDC is measured at terminals 22 (+Ve) and 21.
• If 24 VDC power supply is ON, check that the loading does not exceed 5 W across terminals 21 and 22 (remove wires
from 21, 22, 23, and 24).
• LCD and LED display on the control panel are illuminated.
If these checks are satisfactory, then attempt to locate the fault using the “VIEW DIAGNOSTICS” routine. It is also
recommended that the actuator settings be verified using “VIEW SETTINGS.”
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