5-38 Other Features
PA-1652 Operator's Manual H3-45 Coach
FIGURE 26: TWS MODULE DETAIL
TEST AIM OF ACOUSTIC SENSOR BEAM
(WHEELCHAIR ACCESS)
1. Move wheelchair and passenger slowly towards
doorway. TWS should detect wheelchair and
passenger (LED will flash, buzzer will sound and
the module red light will flash) when centerline of
front wheels is between 18 and 24 inches from
doorway.
2. Open vehicle access door above lift. Lower platform
to ground and place wheelchair and passenger at
rear of platform. Rollstop (rear barrier) should be
up. Raise platform to floor level. This normal
platform motion with wheelchair and passenger
aboard should not actuate TWS. If LED does flash
(buzzer will also sound and module red light will
flash), turn sensor adjustment screw slightly
counterclockwise.
NOTE
If an adjustment is made, repeat the previous
step where wheelchair is between 18 and 24
inches from doorway.
ADJUST ACOUSTIC SENSOR TIMING
1. Support a flat sheet of cardboard, or similar
material, directly beneath TWS module at a
distance of 4½ feet below module. Sheet must be
facing sensors.
NOTE
Before proceeding, visually inspect sensors to
verify that they are pointing directly at floor, or
nearly, and are not pointing off at an extreme
angle.
FIGURE 27: CHECKING NORMAL PLATFORM POSITION
2. Note the sensor timing access hole. This hole
provides access to a plunger-actuated switch that
sets the sensor timing. Insert a 1/16-inch diameter
wire-like object into the access hole and press the
plunger inward. The LED will flash momentarily
while the module establishes the distance and then
remain on steady. Release the plunger when the
LED ceases to flash.
NOTE
It is important that objects, such as your body,
tools, seats, etc, do not interfere with the beam
while the adjustment is being made
WCL CASSETTE INSTALLATION AND
REMOVAL
Refer to section 23 of the Maintenance manual
for the WCL installation or removal procedure.
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