Threshold Warning System (Tws) Adjustment; Adjust Aiming Of Acoustic Sensor Beam - PREVOST X3-45 COACH 2018 Operator's Manual

2. Raise or lower
deploy/stow position; the platform frame
must be parallel to the side of the lift
enclosure. If the exact position cannot be
obtained, slightly low is preferred to slightly
high.
3. Using the rollstop manual control knob and
one hand one the rollstop, close the rollstop
until it latches.
4. Turn the manual platform release shafts
using manual backup
extension to disengage the platform.
5. Use one person on each side of the lift to
prevent mechanical binding.
6. With fingers up and palms forward, push the
platform forcefully to start the lift moving
inward. As the lift begins to move inward,
maintain a constant pushing motion until the
lift comes to rest completely inside the lift
enclosure.
WARNING
When re-inserting platform into compartment,
make sure that carriage wheels are properly
aligned over the L. H. side triangular rail.
7. Push firmly and make sure that the platform
manual release shafts have turned to lock
the platform.
THRESHOLD WARNING SYSTEM (TWS)
ADJUSTMENT
There are three verifications to perform; 1)
Adjust Aiming of Acoustic Sensor Beam, 2) Test
Aim of Acoustic Sensor Beam, and 3) Adjust
Acoustic Sensor Timing.
Adjustment of the sensor timing is done at the
factory and should not need to be repeated in
the field. Readjustment
considered if the sensor aiming could not be
adjusted to ignore both the wheelchair in the
aisle and the platform during its normal
movement.

Adjust Aiming Of Acoustic Sensor Beam

1. Place wheelchair with passenger in center
aisle of coach, pointed at doorway where
Threshold Warning
the platform to the
pump handle
should only be
System (TWS) is
PA1627 X3-45 Operator's Manual
Other Features
installed. The TWS should not detect a
wheelchair and passenger when they are
located this far from doorway.
2. Turn power to lift on (LED on TWS module
will light steady) and indicator light on the
control device illuminates. If wheelchair and
passenger are detected by acoustic sensors
the LED will flash, the buzzer will sound and
the module red light will flash. If this occurs
it is necessary to adjust aiming of sensors.
TWS AREA
3. Turn sensor angle
clockwise to move direction of beam away
from center aisle and towards doorway.
Stop adjustment when LED ceases to flash.
NOTE
Only in rare instances will adjustment be
needed in the counterclockwise direction.
4. Move centerline
wheelchair (with passenger) to within 24
inches of doorway and repeat aiming
procedure in previous step.
TWS MODULE DETAIL
5-39
23371
adjustment screw
of small wheels of
23368