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VII. OPERATION
VSI ELECTRONIC CONTROLLER
The electronic controller is what you use to operate your power chair. The electronic controller enables you to
move the power chair, as well as monitor battery charge, electronic controller functions, and the condition of your
electrical system. The VSI electronic controller is an integral electronic controller. All of the electronics necessary
to operate the power chair are contained in one module. See figure 26. Typically, the VSI is mounted to one of the
armrests and is connected to the motors, batteries, and the onboard charger at the power base. The VSI may be
used to control some optional systems such as power elevating seats and lights.
The controller supplied with your power chair has been pre-programmed to meet your needs. The program is set
using either a personal computer with software provided by the controller manufacturer or with a hand-held
programmer, also provided by the controller manufacturer.
WARNING! The controller program can affect speed, acceleration, deceleration, and brak-
ing. If it is programmed incorrectly or outside of the safe limits as determined by your
healthcare professional, it can create a dangerous situation. Only the power chair manu-
facturer, an authorized representative of the manufacturer, or a trained service techni-
cian should program the controller.
The VSI consists of:
1. joystick
2. keypad
3. off-board charger/programming socket
4. actuator connector (optional)
5. controller connector
6. charger inhibit connector
Joystick
The joystick controls the direction and speed of
your power chair. When you move the joystick
from the neutral (center) position, the electro-
magnetic brakes release and allow your power
chair to move. The farther you push the joystick
from its neutral position, the faster your power
chair moves. When you release the joystick and
allow it to return to the neutral position, you en-
gage the electromagnetic brakes. This causes
your power chair to decelerate and come to a
complete stop.
WARNING! If your power chair begins to move in an unexpected manner, immediately
release the joystick. Unless the joystick is damaged, this action should stop your power
chair.
Keypad
The keypad is located in front of the joystick. It contains keys necessary to operate your power chair. See figure 27.
Figure 26. VSI Controller