Chamberlain LiftMaster Professional SW420 Owner's Manual page 24

CONTROL BOARD PROGRAMMING AND
FEATURES (CONTINUED)
RELAY DRIVE TROUBLESHOOTING LEDS
There are 5 troubleshooting LEDs on relay drives K1 through K5. These LEDs will be illuminated when the microcontroller relay drive is
activated.
LED
D6
D5
D4
D3
D2
TROUBLESHOOTING LEDS
There are 9 troubleshooting LEDs.
LED
D11
D13
D15
D17 (Green)
D19
D21
D24
D29
D31
A D J U S T M E N T
LED NAME
Contactor A
Contactor B
SAM
Lock
Alarm
LED NAME
Radio
Shadow
Hard Close
Stop
Soft Open
Hard Open
Interrupt (Safety) Loop
Obstruction Open
Obstruction Close
DESCRIPTION
On when Contactor A is activated
On when Contactor B is activated
On when SAM relay is activated
On when Mag Lock relay is activated
On when Alarm Relay is activated
DESCRIPTION
On when Radio switch is activated
On when Shadow Loop is activated
On when Close switch is activated
On when Stop switch is not activated
On when Open switch is activated
On when Open switch is activated
On when Interrupt/Safety Loop activated
On when Edge is activated or when Photo Eye
Beam is broken
On when Edge is activated or when Photo Eye
Beam is broken
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