4.2.3 Hard Shutdown 4.2.4 Resetting a Hard Shutdown
A hard shutdown condition occurs when the inherent entrapment protection system has sensed two
consecutive obstructions before the gate reaches the full open or full closed position. It can also be
an indication that the gate is too heavy or that the gate hardware (wheels, rollers) is in poor
condition and needs to be corrected. Do not reduce the operator reversing sensitivity in an
attempt to correct for a poorly designed gate or for hardware that is in need of repair.
Example: The gate is closing and the inherent entrapment protection system senses an obstruction
and causes the gate to reverse direction. As the gate begins to run in the open direction, a second
obstruction is sensed prior to the gate reaching the full open position. Once the second obstruction
has been sensed, the operator will stop, the audio alarm will be activated and all standard inputs are
shut down (including open commands, safety commands, loop inputs, etc.).
NOTE: The audio alarm will remain activated for a maximum of five minutes, or until the operator
receives a reset input. The hard shutdown condition will remain in affect even if the audio alarm
shuts off after five minutes.
After 5 minutes, the audio alarm will “chirp” every 5 seconds. This indicates that the operator is in a
hard shutdown condition and the reset switch must be activated to reset the operator and silence the
alarm.
When the operator is in a hard shutdown condition (audio alarm activated or audio alarm “chirps��
every 5 seconds), the only way to reset the gate operator and return it to normal operation is to
activate the alarm reset input. An alarm-reset switch can be mounted external of the gate operator
provided that it is installed in the line of sight of the gate and gate operator (see 2.6.1).
Before resetting a hard shutdown, determine why the shutdown occurred. Inspect the gate for any
obstructions along its path that could have activated the inherent entrapment sensing system.
Inspect the gate and gate hardware.
NOTE: DoorKing operators have a built-in alarm reset push button mounted on the operator above
the power ON-OFF toggle switch. Activating this button will return the gate operator to normal
operation, but will not activate the gate operator.
Once the gate has been reset, an open or close command is needed to start the gate operator. Most
activating commands will cause the gate operator to cycle to the open position. This includes
activation of a key switch or open command and activation of an open loop. Activation of a close
command will run the gate to the closed position.
NOTE: The gate operator will not lose its limit settings when a hard shutdown occurs.
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