Operator Features - Chamberlain LiftMaster SL930 User Manual

OPERATOR FEATURES

CIRCUIT BOARD
The SL930 uses the Full Systems Capability circuit board, a
powerful control system. This circuit board operates on 12 ~ 18
Volts and can deliver power to the motor through high power
switching. The limit switch input terminals require the use of
normally open type limit switches. These switches are used to
accurately stop the gate operator in the open and closed positions.
To safeguard the operator from damage that could result from
limit switch or system protection failure, the Full Systems
Capability circuit board has a built-in maximum run timer which
will allow the operator to run for approximately 300 seconds and
then shut off automatically. The Full Systems Capability circuit
board has an adjustable gate sensitivity feature which will stop or
reverse the gate if the gate is pushing harder than normal because
of an obstruction.
GATE SENSITIVITY
The SL930 Full Systems Capability circuit board has a built-in
system protection feature which when adjusted properly will
deliver only enough power to the motor to overcome the
resistance of the gate. The amount of power that the circuit board
will deliver can be adjusted for both directions of travel to
accommodate the various gate weights that the SL930 operator is
recommended for (see page 3).
OPERATION
The SL930 Full Systems Capability can operate in a AUTO CLOSE
TIMER (TIMER ON) or a PUSH-TO-OPEN/PUSH-TO-CLOSE
(TIMER OFF) mode of operation. In the AUTO CLOSE TIMER
mode of operation the operator is given a command to open the
gate and hold it open until the input is released and until the auto
close timer has elapsed at which point the operator will close the
gate automatically. In the PUSH-TO-OPEN/PUSH-TO-CLOSE mode
of operation each time a signal is sent to the operator, it will
cause it to do the opposite of what it did before. (i.e., If the gate is
closed, it will start opening, if it is open, it will start closing: If it is
closing, it will REVERSE TO OPEN, if it is opening, it will REVERSE
TO CLOSE.)
CONTROLS
The SL930 Full Systems Capability works with the following
control devices: Key switches, Push buttons (separate or
intercom), numerical key pads and any peripheral equipment
which can supply normally open or normally closed contacts as
well as optional remote controls and receiver (specified by and
available from the manufacturer). These contacts can be
connected to the operator input terminals to perform the opening,
close, safety, or the stop functions.
O P E R A T O R S P E C I F I C A T I O N S
AUTO CLOSE TIMER
The operator comes factory preset with the auto close timer
turned OFF. The auto close timer will close the gate automatically
after a specific amount of time has elapsed. The amount of time
can be easily adjusted between 0 and 45 seconds by turning a
small "pot" located on the right edge of the circuit board (see
page 22). The timer can be disabled or activated by flipping a
single switch located on the top right edge of the circuit board. If
the timer will be used it is recommended that some type of
supplementary safety device be installed. If more time is required,
there is an extended timer available from the manufacturer
allowing up to 100 additional seconds.
MANUAL RELEASE SWITCH
This simple on-off switch is built into the operator. In an
emergency, EVEN WITH THE POWER OFF, the gate can be pushed
open manually after flipping the switch from Operate to Release.
GATE SENSITIVITY ADJUSTMENT
The amount of force necessary to stop the gate can be adjusted to
conform to the various sizes and weights of any particular gate.
When adjusting the sensitivity, the operator can be given only as
much energy as is necessary to overcome the resistance of the
gate. If the gate should strike an obstruction in either direction,
the gate will reverse. If the gate should again strike an obstruction
before reaching a limit, the gate will stop, remain stopped, and
will sound an alarm (see page 22).
MASTER AND SECOND
Some very large entrances may require the use of two gates. If
this is the case, the two gates can be easily automated using the
"master and second" configuration. This configuration uses two
gates and two operators in ONE driveway. The operators used are
two regular SL930 Full Systems Capability operators. One of
which is of standard "right hand operation" and the other which is
easily converted to "left hand operation" by flipping a single
switch located at the top of the circuit board (see page 22).
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