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Troubleshooting (continued)
Symptom
Door runs slowly/at
half speed
Operator turns off
despite backup
battery being
connected
Operator runs
momentarily then
stops in limit learn
mode
No motor
movement; can't
set limits during
commissioning.
And Wall Control
displays "CHECK
STOP CIRCT"
Possible Causes Diagnosis
Wall control
If communications to the wall
disconnected or
control is absent, system will run at
damaged
half speed.
Dead or worn
Low battery voltage
batteries
Blown battery
Visually inspect battery fuses or
fuses on main
check continuity
board
Encoder wiring
Inspect encoder cable for
fault
disconnection, bad connection, cut
cable, etc.
Encoder fault or
Go to limit learn process. Number
encoder interface
displayed while in door limit learn
fault
mode is the encoder position.
Jog door several inches in either
direction and release button.
Number displayed should change.
Make sure to cancel changes or set
limit again when finished.
STOP input circuit
Check for wiring faults.
is open due to
wiring issue.
All devices in STOP circuit should
use notmally closed contacts and
be wired in series between STOP
and CMN. Open circuit means STOP,
closed circuit means GO.
STOP button
Check for stuck stop buttons.
stuck on control
stations.
(does not apply to
LCD wall control,
hich does not
cause this error)
Failed STOP input
Disconnect any wiring connected
(main board is bad)
to the STOP input. Connect a short
jumper wire between STOP input
and CMN terminals to temporarily
test. The CHECK STOP CIRCT
message should go away. If it does
not, there is a problem with the main
board.
64
Resolution
LCD Wall control is strongly
recommended to be connected.
If it is desired to run the system
without a wall control, temporarily
or permanently, the system can be
returned to full speed operation by
replacing the wall control wiring with
a jumper wire.
If the wall control is present but not
functioning, see 'LCD wall control is
off or not functioning'
Allow batteries to recharge
Replace worn out batteries.
Batteries must both be replaced
together. Do not mix old and new
batteries.
If fuses are blown, replace both
fuses together
Correct any issues found with
encoder wiring
If encoder position does not change
with door movement, the encoder,
encoder wiring, and powerhead
main board are suspect. Check all
three for any visible damage.
Attempt power cycling and restoring
factory defaults.
Replace or repair suspected faulty
components.
If STOP is not used, place a jumper
wire between STOP input and CMN
terminal.
If STOP input is used, correct any
wiring problems or issues with the
devices in the stop circuit.
Repair any malfunctioning stop
buttons.
Power cycle the operator with stop
jumper in place and ensure the
problem still persists.
If the problem does not resolve,
replace the main board.
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