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The Quantum 4Front™ Power Chair
Your power chair has two main assemblies: the seat assembly
and the power base assembly. Typically, the seat assembly
includes the armrests, seatback, and seat base. The power
base assembly includes two motor/brake assemblies, two
drive wheels, two rear caster wheels, two front anti-tip
wheels, two batteries, and wiring harnesses. See Quantum
4Front (page 4) and figure 1.
The spring tension on your power chair was factory set
to meet the needs of the demographic majority of users.
Do not adjust the tension of any spring on your power
chair.
Electrical Components
The electrical components consist of the controller assembly,
the batteries, and the motors. The batteries, motors, and
controller power module (if equipped) are located on the
power base assembly. The controller is located on the seat
assembly. Connectivity between the controller and the
motors, batteries, and the battery charger is provided by one
or more wiring harnesses. See figure 1.
Controller Harness Connector: The controller harness
connector is where the controller plugs into the power base.
Each controller uses a different type of harness. Regardless
of which type of controller is used, the harness must be
secured to the seat assembly and not allowed to drag on
the floor.
Motor Connectors: This is where the controller connects to
the motors.
Battery Connector: This is where the controller connects to
the batteries.
Controller Power Module: This enables the controller to
communicate with the batteries and the motors.
Main Circuit Breaker (located on the right side of the
frame): The main circuit breaker is a safety feature built
into your power chair. When the batteries and the motors
are heavily strained (e.g., from excessive loads), the main
circuit breaker trips to prevent damage to the motors and the
electronics. If the circuit trips, allow your power chair to “rest”
for approximately one minute. The circuit breaker will reset
itself. Turn on the controller, and continue normal operation. If
the main circuit breaker continues to trip repeatedly, contact
your Quantum Rehab Provider.
Manual Freewheel Levers
For your convenience, your power chair is equipped with a
manual freewheel lever mounted on each motor. The levers
allow you to disengage the drive motors and maneuver the
chair manually.
To Motor
Connector
To Motor Connector
Controller Power Module
To Battery Connectors
Main Circuit
Breaker
Controller Connector
Suspension
Spring
Caster Sensor
Figure 1. Quantum 4Front Electrical Components
YOUR POWER CHAIR
Figure 2. Manual Freewheel Lever Operation
DRIVE MODE
FREEWHEEL MODE
PROHIBITED!
7


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