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©2006 Sunrise Medical
SEATING SECTION
The PC board has several functions, including routing
the voltage from the controller module to the recline
actuators. The optical encoder sends its signal to
the PC board. The PC board routes this signal to
the control module where it is analyzed for correct
operation and position.
For recline, the PC board receives a signal from a
rocker switch that is mounted in the center of the back.
This switch (the Encoder Reset Switch) is operated
by a sliding link connected to a strut. Its purpose is to
synchronize the optical encoders with the back angle.
This signal is sent to the control module.
The tilt system contains an 18-degree micro switch that
informs the computer when the tilt is at 18-degrees.
The purpose is to reset the encoder circuit each time
the chair is tilted past 18-degrees. With the exception
of the legrest system, the other seating functions reset
during the operation by recording the actions of micro-
switches located within the actuators.
Two reed switches are mounted on the same bracket
that houses the Encoder Reset Switch. One reed
switch is the End of Travel (EOT) “Home” for the up
direction of the actuator, and the other reed switch
is the EOT for the “Back”, or down direction, of the
actuator. These signals are sent to the PC board
which interupts the actuator current when the seatback
reaches either end-of-travel.
The actuators are connected to the PC board. The
actuator drive voltage is provided by the control module
and routed through the PC board to the actuators.
Encoder Reset Switch
Creep (speed reduction) and drive lockout are
controlled by the Delphi system. Twelve degrees of tilt,
40 degrees of recline, or any lift will cause the chair to
drive in creep speed.
Drive lockout will occur anytime two or more of the
functions (tilt, recline) are causing the chair to drive
in creep speed. Example, if the chair is tilted past 12
degrees and also reclined more than 40 degrees, the
chair will not drive.
Fig 3.49
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