POSSIBLE CAUSE SOLUTION
Door jammed or obstructed. Check manual operation of door.
Sprocket key missiing or drive
chain broken.
Check drive chain for operation.
Drive chain too loose; permits
chain to jump teeth on
Adjust chain to proper tension.
Limit nuts binding on screw,
causing them to jump position
on retaining bracket.
Check for free rotation on limit screw. Lubricate screw or
replace nuts if threads are defective.
Limit nut retaining bracket not
engaging notches in nuts.
Set nuts and be sure bracket is in notch on each nut. See
Figure 8.
Door tension incorrect. Disconnect operator and check operation of door.
Dead phase (on 3 phase). Check power supply.
Brake does not release. Check wires to brake solenoid, check adjustment.
*Door locked or jammed. Check door. Try manual operation.
Building fuse blown or circuit
breaker tripped.
Check power supply fuses, circuit breakers, disconnect
switch, check for cause.
Overload protector tripped. Reset and check for cause.
NOTE: To isolate cause, operate
contactor solenoid plunger
manually. If motor runs, cause is
in push button circuit.
Check pushbutton circuits for voltage against voltage
indicated on wiring diagram. Check push button wiring.
Check interlock switch wiring.
Interlock switch broken or
inoperative.
Check that disconnect pin is not making contact with interlock switch
located inside base frame. Check wiring to switch and switch function.
Normally closed for operation electrically and normally open for hand
chain operation.
On three phase operators power
supply is connected out of
phase.
Interchange connections of any two power supply leads.
(See wiring diagram)
Operator not installed
correctly.
Remount operator so that motor is “down” or away from
door wall or contact factory as to wiring changes required.
On three phase operators power
supply is connected out of phase.
Check phase as above.
Limit nuts not adjusted See limit adjustments page 10.
Defective limit switch. Operator limit switfch manually while door is moving to
determine if switch is operative.
Single phase operator (without
instant reverse motor). Stuck
push button or short in control
wiring.
If door overrides up limit, check down button and circuit. If
door overrides down limit, check open button and circuit.
Limit drive chain broken or
inoperative.
Replace chain, check limit screw for rotating.
SYMPTOM
Motor runs but
door does not
move
Limit switches do
not hold setting
Door drifts when
operator shuts off.
Motor hums —
does not run.
Motor does not
run when open or
close wall button
is pressed.
Operator closes
door when “Open”
button is pressed,
and limit switches
do not function
Operator fails to
shut off at fully
open closed
position.
OPERATION AND ADJUSTMENT INSTRUCTIONS
17
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