Microswitches - Braun VISTA Series Installation & Service Manual

Microswitches: Two mi-
croswitches (limit switches) are
incorporated in the VL917 electri-
cal system (Unfold/Down and Up/
Fold). Details and photos of
microswitches are provided
below. Adjust microswitch(s) as
detailed (if necessary only).
Microswitch Sequence:
Stowed Position: When the lift
is in the stowed position, the Up/
Fold and Unfold/Down
microswitches are deactivated
(common and normally closed
terminals have continuity).
Unfold (Out) and Lowering
Sequence: When the lift is in the
Unfold/Down and Up/Fold Microswitches: The
Unfold/Down and Up/Fold microswitches (limit
switches) are located in the pump side tower.
Adjustment: Use a 7/16" socket wrench to turn
the two 1/4"-20 x 5" hex bolts to reposition the
limit switches. Adjust these microswitches as
outlined at right and on Microswitch Adjustment
Instructions decal 24490 (on tower).
W ARNING
Improper microswitch
adjustment may
result in serious
bodily injury and/or
property damage.
Systems Descriptions
stowed position, the Unfold/Down
microswitch is deactivated.
Current to the UNFOLD (Out)
switch circuit energizes the Down
solenoid/valve to unfold the
platform. While the Unfold/Down
microswitch is deactivated, the
DOWN switch circuit is
interupted. When the platform
unfolds fully (reaches floor level),
the Unfold/Down microswitch is
activated. Activating this
microswitch interupts the UN-
FOLD (Out) switch circuit and
redirects current to the DOWN
switch circuit to re-energize the
Down solenoid/valve when the
DOWN switch is pressed.
Floor Level Guideline Adjustments: The
Unfold/Down and Up/Fold microswitches control
platform and bridge plate positioning. Ensure
floor level adjustments are correct as outlined on
pages 28 and 29A. Check platform angle as
outlined on pages 26 and 27 when adjusting
bridge plate positioning.
C
Up/Fold
Microswitch:
Turn adjustment
bolt counter-
clockwise to stop
platform raise
function sooner.
Turn adjustment
bolt clockwise to
allow platform to
raise further.
Raise and Fold (In) Sequence:
When the platform is below floor
level, the Up/Fold microswitch is
activated. This directs current to
the UP switch circuit to energize
the Up/Fold solenoid to direct
current to the pump motor when
the UP switch is pressed. The
FOLD (In) switch circuit is
interupted when the platform is
below floor level. The Up/Fold
microswitch is deactivated when
the platform reaches floor level.
This interupts the UP switch
circuit and redirects current to the
Fold (In) switch circuit when the
FOLD switch is pressed. This re-
energizes the Up/Fold solenoid
and directs current to the pump
motor.
Unfold/Down
Microswitch:
Turn adjustment
bolt clockwise to
stop platform
unfold function
sooner.
Turn adjustment
bolt counter-
clockwise to
allow platform to
unfold further.
Page 37