POSSIBLE CAUSE
SOLUTION
Door jammed or obstructed.
Check manual operation of door.
Trolley disconnected from drive
Reconnect Drive plunger assembly to trolley traveler.
Clutch slipping/v-Belt slipping
Check clutch adjustment. (Pg 16) Check belt for wear and
proper tension.
Drive chain too loose; permits chain
to jump teeth on sprocket.
Adjust chain to proper tension.
Limit sprocket slipping on limit shaft. Check set screws for tightness.
Limit nut retaining bracket not
engaging notches in nuts.
Set nuts and be sure bracket is in notch on each nut. See
Figure 13.
If equipped with brake, brake not
functioning properly.
Check stroke and spring pressure on brake arm. Adjust if
necessary.
Dead phase (on 3 phase).
Check power supply.
Brake (if equipped) 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 control wiring. Contact Tech Support at 1-800-243-
4476
IR Relay not functioning (1Phase)
Relay is on when power first applied, drops out when motor
runs.
On three phase operators power
supply is connected incorrectly. ( Out
of Phase)
Interchange connections of any two power supply leads.
(See wiring diagrams)
Operator controls not wired correctly,
or unit is mounted upside down..
Check control wiring connections on wiring diagram, and
check orientation of unit. Contact Tech Support at 1-800-
On three phase operators power
Check phase as above.
Limit nuts not adjusted properly.
See limit adjustments page 12.
Defective limit switch.
Check continuity. Replace limit switch if necessary.
Limit switch not being activated.
Check that limit nuts are moving correctly when operator
Limit drive chain broken or too loose. Replace chain, check limit screw for rotating.
1 phase unit with motor rotation wrong
Usually occurs after motor replacement. Check for correct
type motor, motor wiring, and correct operator mounting.
Limit sprocket slipping on shaft
Check set screws for tightness.
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
properly.
Operator fails to
shut off at fully
Open or Closed
position.
24
OPERATION AND ADJUSTMENT INSTRUCTIONS
Summary of Contents for SL Series
Page 26: ...Notes ...
Page 27: ...Notes ...
