28
Master or Second
operator is not
functioning
properly.
Failure to cycle power after setup.
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.
The communication wiring may be
damaged or improperly wired for dual
gate operation.
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.
The master or second unit is not
programmed correctly.
Review program settings pages 25-26 and check both the master and
second for proper programming.
Operator runs but
then stops and
reverses direction.
Entrapment (Force Pot) incorrectly set. This pot must be set so that the gate will run smoothly normally and
reverse when encountering an obstruction. See page 23.
Gate is binding or not running
smoothly.
Disconnect the gate from the operator and swing the gate open and
close by hand at normal operating speed. Make sure that the gate
swings smoothly and does not bind. If the gate is hard to move or
binds repair the gate.
Observe red LEDs D29 and D31.
Both LEDs will indicate the activation of entrapment protection devices
on terminals J1-9 & J1-10 on the control board. Remove the devices
and retest. If the operator now runs without fault, check those
accessories as well as their wiring.
The Hall Effect Sensor is not aligned/
adjusted correctly.
Make sure that the sensor is adjusted so that it is within 20
thousandths of an inch or as close to the magnets located on the
gearbox pulley as possible without coming into contact with them or
the pulley.
Replace the sensor if it is adjusted correctly but continues to fail.
The operator opens
immediately upon
power up and does
not close.
Check the red input status LEDs,
D11-D31, for indication of an active or
malfunctioning accessory.
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.
Programming
changes do not
effect the gate.
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.
Open photo eye
reverses gate
closed when
activated during
opening
.
Open obstruction input is programmed
incorrectly.
The open obstruction input has been programmed to function with
gate edges not photo eyes. Refer to page 26 and reprogram the
obstruction inputs for correct operation.
Gate does not
activate the timer to
close after the close
photo eye is
broken.
Close obstruction input is
programmed incorrectly.
The close obstruction input has been programmed to function with
gate edges not photo eyes. Refer to page 26 and reprogram the
obstruction inputs to match the accessories that are installed on the
operator.
Radio controls will
close gate from the
open limit.
Radio terminals R1-4 are factory
configured for residential (Open and
Close) radio function.
Configure terminals R1-4 for residential radio function by performing
the following modifications:
1. Locate and disconnect the end of the wire running to terminal
J1-1 from R4.
2. Connect the end of wire removed from J1-1 to J1-6. Refer to
page 34.
T R O U B L E S H O O T I N G c o n t i n u e d
SYMPTOM
POSSIBLE
CAUSES
SOLUTION
Содержание LiftMaster Professional SW420
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