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THRESHOLD WARNING SYSTEM
Refer to
Figure 2-9
for the location of the sensor portion of the threshold warning system. The
lift incorporates two light beams that detect when a passenger (or object, such as a wheelchair)
is in the vicinity of the baseplate or bridgeplate (threshold area). The beams are enabled when
the platform is one inch, or more, below the vehicle floor. If someone passes through either of
the beams when the platform is one inch below the floor an audible buzzer is actuated. This sys-
tem provides a margin of safety for lift users by warning them if the platform is below floor level.
The platform must be at floor level when boarding the platform prior to exiting the vehicle.
MANUAL BACK-UP PUMP
Refer to
Figure 2-9
. The manual backup pump is used to operate the lift if electrical power is not
functioning. Controls for the pump consist of a pump handle to raise platform and a pump pres-
sure release valve to lower it. Instructions for operating manual pump are provided in the
MANUAL OPERATION SECTION later in this chapter.
PUMP HANDLE
SOCKET
PUMP PRESSURE
RELIEF VALVE
PUMP HANDLE
MANUAL BACKUP
PUMP
FIGURE 2-9: MANUAL BACKUP PUMP & HANDLE
LIGHT
BEAMS
APPROXIMATE
THRESHOLD
AREA
BUZZER
(INSIDE)
FIGURE 2-9: THRESHOLD WARNING SYSTEM
