43
PROBLEM POSSIBLE CAUSE AND SOLUTION
Gate does not raise or lower
(motor is running or
humming on powered gates)
• The lifting chains may be disconnected or off
their sprockets. Check and correct as
necessary.
• Rotation on the 3-phase motor may be reversed.
Reverse any two motor electrical leads.
• The 3-phase motor may be single-phasing
(humming). Check wiring, fuses, etc.
• The voltage at the motor terminals may be too
low to run the motor with the existing load.
Check by measuring the voltage at the motor
terminals (or as near as possible) while the
motor is running under load. Inadequate or
incorrect wiring can starve the motor when the
source voltage is ample. Correct as necessary.
• The motor brake may be seized if the motor is
humming, blowing fuses, or overloads. Remove
the motor and check to see if the brake is
working correctly.
Powered Gate Motor labors
or heats excessively.
• The voltage may be low. Check at the motor
terminals while the motor is running under load.
Inadequate wiring can starve the motor even
when the source voltage is ample.
• The wiring may be incorrect. Be sure one leg of
the motor line is not connected to the ground
prong. This can happen particularly on 3-phase
units using twist-lock plugs.
• The gear reducer may be binding from oil
starvation. This can cause high internal heat.
The gear reducer can be irreparably damaged
by oil starvation and may have to be replaced!
Powered Gate operates in a
“spongy” or jerky fashion.
• The chain sprockets may be binding. Check
and repair
• The chain may be off of a sprocket. Check and
repair.
• The gate panel may be binding in the guide
ways. Check and repair.
TROUBLESHOOTING ANALYSIS
