Troubleshooting Guide - Chamberlain GT Owner's Manual

TROUBLESHOOTING GUIDE

SYMPTOM
Each open command will open
the door about a foot and a half
then stop, after reaching the open
limit each close command will
close the door about a foot and a
half then reverses back to full
open.
The door will open some but not
completely. And the door will
close some and not completely.
Extra commands are able to get
the door to move completely
The door will open some but not
completely. An extra open
command is able to get the door
to open completely
The door will open but will only
close after a 5 second delay with
constant pressure on the close
button.
The operator will not respond to
any commands
Clearing The Memory 3 - steps
STEP 1
: To reset most of the user installed settings back to factory defaults:
1. Turn all the dip switches ON.
2. Press and hold the Learn button about 5 seconds.
3. The Learn LED will turn off while you hold the button down and turn back on about 5 seconds later.
4. Return the dip switches to the desired wiring type.
Note: A. The Max Run Timer is now set to 90 seconds
B. The Timer To Close is now set to 0 seconds
C. The Mid Stop is now deactivated
D. The Maintenance Alert System is now deactivated
Note: To clear the Mid Stop only Set/Program the Mid Stop at the
open limit. The logic board understands this to mean that no mid
stop is desired.
TROUBLE SHOOTING
PROBABLE CAUSE
RPM sensor is not adjusted
correctly.
The Maximum run timer is not
set correctly.
There may be a Mid Stop set.
a) The Photo Eyes, edge or
other sensing device is
obstructed or activated.
b) The Logic board thinks that
the direct connect photo eyes
are attached and blocked
a) Operator control station is
wired wrong
b) Motor is malfunctioning
20
RESOLUTION
Reset the RPM sensor. Also
verify that the software is
version 260 or better.
Order replacement chips from
Parts and Service.
Reset the Maximum Run Timer
Reset the mid-stop by
programming it to be at the open
limit.
a) Remove the obstruction,
check the safety device wires
for continuity and shorts.
b) Unlearn the photo eyes
from the memory (see clear
memory section). Also
verify that the Logic Board
Chip is Version 260 or
better. Order replacement
Chips from Parts and Service.
a)
Use the LEDs to help check
correct wiring (see
Diagnostic procedure) Verify
that the board is accepting
commands by using the
onboard control station.
b) Verify voltage getting to the
motor.