OverWatch - User - Crush Event Cutout
The Overwatch is an aid to the operator and this system should not in any way replace operator
training.
The system relies on optical detection principals and may not work in all situations
and environments.
A normal crush event can occur when the platform is in elevate mode and the operator becomes pressed against
the platform handrail and an object above. With the Overwatch, this event is detected based on the operator’s
acceleration, velocity and current position.
An illustration of a crush event is shown below.
If a crush event is detected by the Overwatch, the machine cutout will be applied, and the operator will be
disabled from elevating the machine and the system will announce “Cutout”. The operator can always descend the
platform or apply the system override to regain control and move out of the dangerous situation. Since the
Overwatch only applies the cutout to the upper control panel, the lower panel can be used at any time to take
control of the machine and lower the platform.
In the situation where a crush event has been detected, and the Overwatch has sensed that the operator has not
moved position in 5 seconds since cutout, the Overwatch calculates that the operator may be pinned, stuck or
incapacitated. The Overwatch will sound the machine’s horn 3 times every 10 seconds. This is to alert
surrounding workers about the situation, so that they may assist where required. If the operator releases and then
presses the joystick trigger, the Overwatch determines that the operator is not incapacitated and is able to
control the machine and cancels the horn alert.
The Overwatch only applies the cutout to the upper control panel, the lower panel can be used at any time to take control of the machine and lower the platform.