Troubleshooting; Visual Feedback Leds - Chamberlain LiftMaster SL930 User Manual

VISUAL FEEDBACK LEDS

The SL930 Full Systems Capability circuit board has been
equipped with Visual Feedback LEDs to simplify installation and
troubleshooting. These are small lights which are located directly
beside the input terminals. These LEDs give visual information to
the installer or service technician indicating what commands are
going into the circuit board from devices such as limit switches
or from peripheral devices such as radio receivers or safety
loops. There are also two LEDs which show output to the motor
for both the opening and closing directions.
LED INPUT DESCRIPTION
Limit Switch 1 One of the normally open limit switches is
pressed in and the gate is in the open
position.
Limit Switch 2 One of the normally open limit switches is
pressed in and the gate is in the closed
position.
Safety Indicates that there is a closed contact
between safety input terminal 4 and
common.
Open Indicates that there is a closed contact
between open input terminal 5 and
common.
Pulse Open Indicates that there is a closed contact
between Pulse Open input terminal 7 and
common.
Stop Indicates that there is a closed contact
between stop input terminal 9 and common.
Under normal operating conditions, this
LED must be in the on condition in order for
the system to function.
Close Indicates that there is a closed contact
between close input terminal 10 and
common.
T R O U B L E S H O O T I N G
26
Limit Switch 1 LED
Limit Switch 2 LED
Safety LED
Open LED
Pulse Open LED
Stop LED
Close LED