lift-master sw470 Manual De Usuario

24

Troubleshooting

Doc 01-G0665
Rev C

A properly installed SW470 or SW490 operator will operate for many years with a minimum or service
maintenance.  It is important to note, however, that a binding or defective gate can severely reduce the
life of the operator.  The gate operation should be checked frequently as recommended by the
manufacturer.  All operator bearings are of the lifetime sealed anti-friction or impregnated type.  The
motor is factory lubricated and requires no additional lubrication.

Should electrical malfunction occur, consult the troubleshooting chart below.

Motor does not run when
OPEN or CLOSE button is
pressed.

Building fuse blown or
circuit breaker tripped

Replace fuses or reset
breaker and check for
cause.

Overload protector tripped.

Reset and check for cause.

Control circuit not
functioning.

Check transformer
secondary voltage.  Check
contactor coils for possible
burnout.  Check limit
switches.  Inspect control
station and all field wiring.

Gate closes when OPEN
button is pressed and limit
switches do not function.

Three phase power supply
is connected out of phase.

Interchange any two
incoming power supply
leads.

R.H./L.H. program.

Review page 13 for
R.H./L.H. programming.

Operator does not shout off
at fully opened or closed
position.

Limit nuts not properly
adjusted.

See: Limit Switch
Adjustment.

Limit switch damaged.

Check limit switch
operation and replace if
necessary.