Chamberlain LiftMaster Professional SL585, Manual

27

FAULT POSSIBLE 

CAUSE 

FIX

MASTER OR SECOND
OPERATOR IS NOT
FUNCTIONING PROPERLY

OPERATOR RUNS IN
WRONG DIRECTION

OPERATOR RUNS BUT
THEN STOPS AND
REVERSES DIRECTION

MOTOR RUNS BUT GATE
DOES NOT MOVE;
OPERATOR STOPS AND
ALARMS

OPERATOR OPENS
IMMEDIATELY UPON
POWER UP AND DOES NOT
CLOSE

OPERATOR HAS TROUBLE
LEARNING THE MOTOR

PROGRAMMING CHANGES
DO NOT EFFECT THE GATE

GATE EDGE PAUSES GATE
WHEN STRUCK DURING
OPENING

GATE DOES NOT ACTIVATE
TIMER TO CLOSE AFTER
THE CLOSE PHOTO EYE IS
BROKEN

1)  Failure to cycle power after setup

2)   Communication wiring may be 

damaged or improperly wired for dual 
gate operation

3)  Master or second unit is not 

programmed correctly

T R O U B L E S H O O T I N G

➤ 

 The power to each unit must be cycled in order to initiate proper 
master/second communication if the operators were previously in 
stand-alone mode.

➤ 

 Make sure that the communication wire that is used is twisted pair 
and not run in the same conduit with any power wiring. Failure to do 
so will result in interference across the master/second 
communication line.

➤ 

 Review program settings page 20 and check both the master and 
second for proper programming.

1)  Operator’s main power is out of phase 

(three phases only)

➤ 

 Turn off the unit’s main power at the breaker and swap any two 
power leads at the operator’s main power switch. Apply power and 
retest the operator. See important note on page 12.

1)  Entrapment (force pot) incorrectly set

2)   Gate is binding or not running 

smoothly

3)  Clutch is not adjusted properly

4)  Brake is not functioning properly

5)  Observe red LEDs D29 and D31

6)  RPM (Hall Effect) Sensor

is not aligned

➤ 

 This pot must be set so that the gate will run smoothly normally and 
reverse when encountering an obstruction.

➤ 

 Disengage the manual release and roll gate open and close by hand at 
normal operating speed. Make sure that the gate runs smoothly and 
does not bind. If the gate is hard to move or binds, repair the gate.

➤ 

 Adjust the clutch so that the operator can move the gate throughout 
its travel without slipping but will slip when the gate hits an 
obstruction.

➤ 

 Make sure that the brake operates correctly. The brake should 
disengage when the contactor activates and engage when the 
contactor releases.

➤  

Both LEDs will indicate the activation of entrapment protection 
devices on terminals TB1-9 and TB1-10 on the control board. 
Remove the devices and retest. If the operator now runs without fault, 
check those accessories as well as their wiring.

➤  

Make sure that the sensor is adjusted so that it is centered over the 
limit shaft’s magnet and is 10-15 thousandths of and inch (business 
card thickness) from the magnet.

➤ 

 Replace the sensor if it is adjusted correctly but continues to fail.

1)  Clutch is not adjusted properly

2)  Operator’s manual release is not 

aligned

➤ 

 Adjust the clutch so that the operator can move the gate throughout 
its travel without slipping but will slip when the gate hits an 
obstruction.

➤ 

 Make sure that the manual release is not engaged. The operator’s 
manual release, when engaged, will set off the entrapment if the gate 
is given a command to move.

1)  Active or malfunctioning accessory 

check the red input status LEDs,
D11-D13

➤ 

 If any red LEDs are on, check the corresponding input. An installed 
accessory may be wired incorrectly or malfunctioning. Remove the 
accessory and test the operator.

➤ 

 If the soft open or interrupt (safety) loop LED is on, make sure 
factory plug-in loop detectors are working properly and appropriate 
loops are installed on the loop input terminals.

1)  Operator’s manual release is engaged

➤ 

 Make sure the manual release is not engaged. The operator’s manual 
release, when engaged, will not allow the entrapment sensor to 
provide feedback to the control board when the operator is moving.

1)  Check the save switch on switch S1-1

➤ 

 If the switch S1-1 is in the on position, any subsequent programming 
changes will not affect the gate. To make programming changes, 
switch S1-1 off, make desired changes, and then switch S1-1 on.

1)  Open obstruction input is 

programmed incorrectly

➤ 

 The open obstruction input has been programmed to function with 
photo eyes, not gate edges. Refer to page 15 and reprogram the 
obstruction inputs for correct operation.

1)  Close obstruction input is 

programmed incorrectly

➤ 

 The close obstruction input has been programmed to function with 
gate edges, not photo eyes. Refer to page 15 and reprogram the 
obstruction inputs to match the accessories that are installed on 
operator.