Chamberlain LiftMaster Professional GOC2A Instructions page 12

FUNCTION AND DESCRIPTION OF DIP SWITCHES
The dip switches are needed for adjustment of the basic
settings of the control unit. The settings should only be
changed while the gate is in its quiescent state
(logic function).
Dip switch 1 Definition of terminal 13
O Off= photoelectric barrier. NC contact (relay
N
is tested)
ON= contact strip or the like. NC contact
(relay not tested)
Dip switch 2 Definition of terminal 14
Off= photoelectric barrier. NC contact (relay
is tested)
ON= contact strip or the like. NC contact
(relay not tested)
Dip switch 3 Automatic admission
OFF = OFF
ON=ON
Dip switch 4 Preliminary flash function
The signal lamp flashes 3x before each trip.
FUNCTION AND DESCRIPTION OF POTENTIOMETERS
The settings should only be changed when the gate is in its
closed state (logic function).
Potentiometer 1 Force adjustment
It should be possible to hold the gate open
by hand (force required about 15 kg). Exact
adjustment of the force setting is only
possible if the gate is operating perfectly.
The force required to actuate the gate
should remain constant over the whole
distance covered. If necessary, the gate
must be repaired or reworked.
Potentiometer 2 Partial opening
The opening duration can be adjusted in
the range 2-16 seconds.
Potentiometer 3 Time delay for automatic admission
(5-120 seconds).
DESCRIPTION OF LEDS
The LEDs give you information about the current status of
the control unit. If the unit is not functioning properly, they will
support trouble-shooting.
LED1 Logic diagnosis
Off: No error message
1x: Safety device terminals 6 and 7 activated
2x: Safety device terminals 11 and 12 activated with
function as NO contact
3x: Safety device terminals 12 and 13 activated with
function as NO contact
4x: Safety device terminals 11 and 12 activated with
function as photoelectric barrier
5x: Safety device terminals 11 and 13 activated with
function as photoelectric barrier
6x: Photoelectric barrier defective
7x: Maximum delay time (120 seconds) exceeded
LED2 Emergency stop/photoelectric barrier terminals (6+7)
If the LED of the NC contact is lit up, the control unit
is active. If the LED is not lit up, check the devices
connected to these terminals.
LED3 Gate fully opened (terminals 8, 10)
This LED lights up when a switching pulse is being
sent to the motor. If this LED is lit up all the time, this
indicates a connection error.
LED4 Gate partially opened (terminals 8, 9)
This LED lights up when a switching pulse is being
sent to the motor. If this LED is lit up all the time, this
indicates a connection error.
LED5 Check on DW strip (terminals 11, 12)
If the LED of the NC contact is lit up, the control unit
is active. If the LED is not lit up, check the devices
connected to these terminals.
LED6 Check on photoelectric barrier (terminals 12, 13)
If the LED of the NC contact is lit up, the control unit
is active. If the LED is not lit up, check the devices
connected to these terminals.
LED7 OPEN limit switch
The LED goes out when this limit switch is actuated.
LED8 CLOSED limit switch
The LED goes out when this limit switch is actuated
Note: If both LEDs go out when the limit switch is actuated,
the limit switch cables are connected the wrong way round.