Troubleshooting - Chamberlain Liftmaster Professional SL595 Owner's Manual

FAULT POSSIBLE CAUSE
OPERATOR FAILS TO RUN
1) Improper wired stop control
2) Fault in the operator check the yellow
3) An accessory is active or
4) Improper J4 connector wiring
5) Low or no high voltage power
6) Low or no low voltage power
7) No LEDs illuminated on the
CONTACTOR CHATTERS
1) Transformer's secondary is overloaded
WHEN OPERATOR BEGINS
TO MOVE
2) Low primary (high voltage) power
OPERATOR RUNS SLOW
1) Low primary (high voltage) power
AND/OR TRIPS THE
INTERNAL OVERLOAD
2) Problem in the motor
3) Problem in the contactor
4) Problem in the brake system
T R O U B L E S H O O T I N G
diagnostic LED at the top right of the
control board next to the programming
dip switches.
malfunctioning check the red input
status LEDs, D11-D31
(master/second)
control board
FIX
➤
Check the green LED (D17) on control board. If the green LED is off,
check to make sure a stop control has been installed across terminals
TB1-3 and TB1-5 of the terminal strip.
➤
If the yellow LED blinks six times, there is a master/second unit
communication failure. If operator is a single unit, make sure there is
a jumper across terminals TB1-11 and TB1-12. If operator is in a dual
gate configuration, make sure that the communication wiring between
the two units is undamaged and complete.
➤
If the yellow light is solid, the board needs to learn the motor. Follow
the directions on page 24.
➤
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 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.
➤
Stand-Alone Operators: Make sure there is a jumper installed across
the J4 connector.
➤
Master/Second Operation: Make sure that the master/second wiring is
installed correctly and is intact (not damaged).
➤
Verify power supply to operator. It should be within 5% of the
operator's rating when running. Make sure that the proper wire gauge
was used for the distance between breaker and operator by consulting
the wiring specifications section on page 8 of this manual.
➤
Measure the voltage at terminals R1 and R2 in the operator. This
voltage should be within 5% of 24Vac. If the high voltage power is
good and the low voltage power is bad, check to make sure the circuit
fuse is not tripped and that the correct primary tap is used on the
transformer. If fuse and tap are correct, replace the transformer.
➤
If both primary and secondary power is good, check to make sure
that the J2 connector is making good contact with the pins on the
control board. If all is good, replace the control board.
➤
Remove all accessory devices and test the operator. If the contactor
stops chattering, find an alternate power source for some of the
devices.
➤
Verify power supply to operator. It should be within 5% of the
operator's rating when running. Make sure that the proper wire gauge
was used for the distance between breaker and operator by consulting
the wiring specifications section on page 8 of this manual.
➤
Measure the incoming line voltage at the unit's on/off switch as well
as the meter base or sub panel. Make sure there is not a major
change in voltage. The voltage at the operator should be within 5% of
the operator's rating when running.
➤
Check the number of amps currently being drawn from the panel.
Make sure that the total power being drawn does not exceed the
panel's rating.
➤
Make sure that the proper wire gauge was used for the distance
between breaker and operator by consulting the wiring specifications
section on page 8 of this manual.
➤
Perform a visual inspection of the motor. Examine the motor's labels
for any distortion or signs of overheating. Replace the motor if it is
humming, grinding or making excessive noise. NOTE: Repeated
motor problems indicate poor primary power.
➤
Examine the contactor for sparking, smoke or burn marks. Remove
the wires from one side of the contactor, then measure the contact
points for high resistance (above 1 ohm). Replace the contactor.
➤
Make sure that the brake is disengaging when the contactor pulls in
and engaging when the contactor releases. Replace solenoid.
26