Chamberlain HS670 - Manual (Page 25)

25
OPERATOR FAILS TO RUN
CONTACTOR CHATTERS
WHEN OPERATOR BEGINS
TO MOVE
OPERATOR RUNS SLOW
AND/OR TRIPS THE
INTERNAL OVERLOAD
1) No stop control
2) Fault in the operator check the yellow
diagnostic LED at the top right of the
GL board next to the programming dip
switches.
3) An accessory is active or
malfunctioning check the red input
status LEDs, D11-D31
4) Low or no high voltage power.
5) Low or no secondary voltage power
6) Improper TB11/TB12 wiring
(Master/Second)
7) No LEDs illuminated on GL board
T R O U B L E S H O O T I N G
➤ Check the green LED (D17) on GL 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 14.
➤ 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 loop LED is on, make sure factory plug-in loop
detectors are working properly and appropriate loops are installed on
the loop input terminals.
➤ Measure the incoming voltage at the unit’s on/off switch. 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 12 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 secondary voltage power is bad, check to make sure the
circuit fuse is not blown and that the correct primary tap is used on
the transformer. If fuse and tap are correct replace the transformer.
➤ Stand-alone Operators: Make sure there is a jumper installed across
TB11 and TB12.
➤ Master/Second Operation: Make sure that the master/second wiring is
installed correctly and is intact (not damaged).
➤ 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 GL
board. If all is good, replace GL board.
1) Transformer’s secondary is overloaded
2) Low primary (high voltage) power
➤ Remove all accessory devices and test the operator. If the contactor
stops chattering, find an alternate power source for some of the
devices.
➤ Measure the incoming line voltage at the unit’s on/off switch. 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 12 of
this manual.
1) Low primary (high voltage) power
2) Problem in the motor
3) Problem in the contactor
4) Rail slippage
➤ 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 12 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.
➤ Observe the drive wheels as they move the gate. If the wheels slip on
the rail, tighten the compression springs until the rail no longer slips.
FAULT POSSIBLE CAUSE FIX