LiftMaster LA400 Residential DC Linear Gate Operator - Manual (Page 34)

Without a properly installed safety reversal system, persons (particularly small
children) could be SERIOUSLY INJURED or KILLED by a closing gate.
• Too much force on gate will interfere with proper operation of safety reversal
system.
• NEVER increase force beyond minimum amount required to close gate.
• NEVER use force adjustments to compensate for a binding or sticking gate.
• If one control (force or travel limits) is adjusted, the other control may also
need adjustment.
• After ANY adjustments are made, the safety reversal system MUST be tested.
Gate MUST reverse on contact with a rigid object.
FORCE
D4
D2
FORCE
OFF MAX
2
33
FORCE ADJUSTMENT
The operator is equipped a with an obstruction current sensing feature. If the gate
encounters an obstruction the operator will automatically reverse direction and stop.
Based on the length and weight of the gate it may be necessary to make force
adjustments. The force adjustment should be high enough that small objects such as
branches or wind will not cause nuisance interruptions but low enough to prevent
serious injury to a person or a vehicle.
TO ADJUST THE FORCE
Using the 3-button remote or the Single Button Control (SBC) button on the
control board, open and then close the gate.
If the gate stops or reverses before reaching the fully open or closed position
increase the force by turning the force control slightly.
Run operator through a complete cycle.
Test the force by making sure the gate will stop and reverse on contact with an
obstruction.
NOTE: Weather conditions can affect the gate movement, so seasonal adjustment
may be required. The force control is factory set to the mid position.
TIMER-TO-CLOSE (TTC)
The Timer-to-Close feature can be set to automatically close the gate after a specified
time period. The TTC is factory set to OFF.
If the TTC is set to the OFF position, then the gate will remain open until the operator
receives another command from a remote control or SBC. The gate must be fully
open for the timer feature to activate and close the gate.
TO SET THE TIMER-TO-CLOSE
Rotate the Timer-to-Close dial to the desired setting. The range is 0 to
180 seconds, 0 seconds is OFF. The "TIMER RUNNING LED" will flash once
for every second of adjusted time.
NOTE: Any radio command, SBC or CLOSE command on the control board prior to
the TTC expiring will close the gate. The TTC is reset by any signals from the loops,
close edges and close photoelectric sensors (IR’s).
ADJUSTMENT
» FORCE ADJUSTMENT + TIMER-TO-CLOSE (TTC)
1
2
3
1
1
3
TIMER TO CLOSE
D4
D2
TIMER TO
CLOSE
OFF MAX
1
4