Chamberlain LIFTMASTER PROFESSIONAL SW470 - Manual (Page 18)

18
Limit Switch “B”
Limit Switch “A”
Aux switch (optional)
Drive Shaft
Set Screw
18
LIMIT SWITCH ADJUSTMENT
NOTE: For limit location and configuration refer to Figure 1.
1. Before turning on power, disconnect extension arm from
gate bracket so gate is no longer connected to operator.
Push manual release pin(s) up through the control arm, slide
clevis pin in place and secure with a cotter pin.
2. The (3) collars are held to shaft by set screws. The collars
should now be loose on the shaft. If not, loosen all set
screws until collars are moving freely on shaft.
TO ADJUST CLOSE LIMIT SWITCH
3. Turn on electrical power.
4. Press CLOSE button (if installed) or connect terminals
4 & 5 on J1 terminal strip to cause the gate to close. The
control arm should move in the close direction.
5. When control arm is pointed in approximate direction of gate
bracket (on fully closed gate) press STOP button or release
terminals to stop control arm.
NOTE: If control arm does not move far enough to point in proper
direction, the close limit switch has been prematurely actuated.
Turn off power, loosen set screw on close limit cam and rotate
nut away from close limit switch. Repeat steps 3 and 4 until
control arm is pointed in correct direction.
6. Turn off power. Be sure close limit cam is freely turning.
Rotate cam in close direction. Stop when cam just clicks
close limit switch. Tighten set screw.
7. Reconnect gate bracket to extension arm. If arm has moved
too far in close direction to allow connection of gate bracket
turn off power, connect terminals 5 & 7 to rotate arm in
opposite direction, and press STOP button when arm is in
desired position.
TO ADJUST OPEN LIMIT SWITCH
8. Turn on power. Press OPEN button (if installed) or connect
terminals 5 & 7 on J1 terminal strip. Gate should open. If
gate does not open the open limit cam may be already
actuating open limit switch or an improper electrical
connection may have been made. Turn off power, inspect,
correct and repeat this step.
9. When gate reaches desired fully open position press STOP
button or release terminals. Turn off power. Limit cam
should turn freely. Rotate cam in open direction. Stop when
cam just clicks the open limit switch. Tighten set screw.
10. Fine tune both switch settings by using J1 terminals 4 & 5
(to CLOSE) of 5 & 7 (to OPEN) and the factory supplied
STOP button to move gate and rotating limit collars slightly
to alter gate travel. Rotate cam away from limit switch to
increase travel, toward switch to decrease travel.
A D J U S T M E N T
When following limit switch adjustment procedure, the motor
belt will turn and the control arm will move during some
steps. Keep hands and tools out of operator and away from
arm and drive shaft unless power is off or SERIOUS INJURY
may occur.
ATTENTION
AVERTISSEMENT AVERTISSEMENT
AVERTISSEMENT
WARNING
CAUTION CAUTION
WARNING
WARNING
PRECAUCIÓN ADVERTENCIA
ADVERTENCIA ADVERTENCIA
DIRECTION OF
GATE TO OPEN
RIGHT
(Factory Default)
LEFT
OPEN
LIMIT
A
B
CLOSE
LIMIT
B
A
LIMIT DIRECTION
Limit Cam
Limit Switch