Power Drive System, Integral controller

Power Drive System

The Metro Power III power drive system consists of two independent rear drive wheels, an integral controller, independent, direct drive right and left motors, and two twelve volt batteries (not sup- plied by Graham-Field) that provide power.

Integral controller

The VSI Integral Controller contains the joystick, battery charger receptacle (also used for the optional program- mer), motor and battery cables, and the mounting holes for the extension bracket, as well as those features found on the control panel: The ON/OFF switch, battery gauge, maximum speed/ profile indicator, horn button, speed/ profile decrease button, and speed/pro- file increase button. Their descriptions follow.

battery box connector motor connector

	joystick
	control panel
mounting holes	battery charger/
	programmer
	receptacle
	VSI integral controller *

*VSI is a trademark of PG Drives Technology, Inc.

Joystick

The JOYSTICK controls the speed and direction of wheelchair travel. The further you push the joy- stick from the rest position the faster your wheelchair will move. When the joystick is returned to the neutral (center) position or released, the control system will bring the wheelchair to a smooth stop.

Upon stopping, electromechanical park brakes will engage to prevent the wheelchair from rolling.

Moving the joystick forward (away from the user) causes the wheelchair to move forward. Moving the joystick back (toward the user) causes the wheelchair to travel in reverse. When the joystick is moved right to 3 o’clock position, the wheelchair will turn to the right; when the joystick is moved left to 9 o’clock position, the wheelchair will turn to the left.

Battery charger receptacle (and optional programmer receptacle)

The receptacle for the battery charger / optional programmer is located on the underside of the con- troller as specified in picture above. Use only the battery charger supplied with the wheelchair.

sCaution: Use only the battery charger supplied with your wheelchair. Use of another battery charger could damage the Controller and the battery charger.

Motor and battery cables

The cables that connect to the left and right motors are labeled. The battery cable is either labeled or color-coded to match the appropriate battery box connector.

Mounting holes

The holes that mount the controller to the controller extension bracket are on the underside of the controller as specified in picture above.


Metro Power III Owner’s Manual	GF0600059RevB06, November 2006	13

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