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5.2 Shutdown Conditions
Under various entrapment conditions the operator will assume either a
soft
or
hard (alarm)
shutdown. To determine what
type of reset action is required, you will need to understand how the different entrapment conditions affect the gate
operator.
This occurs in various situations where the inherent or entrapment protection devices have been activated. In a soft
shutdown condition, the operator
will not
respond to any input that was present when the entrapment protection
device sensed an obstruction. If the gate stops at the open position, the operator will not respond to the automatic
close timer.
NOTE: In some systems, the time clock input comes from the telephone entry system relay. This same relay may also
provide open commands for a card reader, MicroPLUS transmitters and the visitor telephone entry. If so, these devices
will also be disabled in a soft shutdown condition.
In some conditions, a soft shutdown will reset as soon as the entrapment condition clears. For example, if a
non-contact sensor (photo sensor) is sensing an obstruction, the operator will stop the gate and assume a soft
shutdown condition. When the photocell clears, the operator will return to normal operation.
When the operator is in a soft shutdown, activation of any "intended input" will reset the operator. An "intended
input" includes any command, any standard safety input and any loop input. Activating any of these inputs will reset
the gate. At that point the gate will return to normal operation. If the gate is open, the automatic close timer will
then time out and close the gate.
•
Example 1
- A time clock keys the gate open in the morning and an entrapment protection device senses
an obstruction prior to the gate reaching the full open position. If the entrapment is sensed by the inherent
system, the gate will reverse and run back to the closed position. The time clock input is still present, but
the gate will not re-open.
•
Example 2
- If the gate is closing and an entrapment protection device is activated, the gate will either stop
or reverse and run back to the open position, depending upon if the secondary or inherent device was
activated. The automatic close timer will not close the gate.
•
Example 3
- Vehicle arrives at open loop and gate runs towards the open position. The inherent entrapment
protection is activated. The gate reverses and runs back to the closed position. If the vehicle is still present
at the open loop a soft shutdown condition does not occur. The loop input provides an immediate reset of
the operator and the gate will again run to the open position.
•
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.).
•
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.
Soft Shutdown
Resetting a Soft 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 closed position.
Hard Shutdown (Alarm Activated)
The audio alarm will sound for five minutes, or until the operator’s reset button is pushed. After (5) five minutes the
alarm will “chirp every 5 sec.” and the hard shutdown condition will remain in affect until the reset button is pushed.
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