Testing; Testing Motor; Testing Motor Brake; Rain Test - Invacare Fox Service Manual

7 Testing

7.1 Testing motor

• Phillips screwdriver size 2
• Digital multimeter with resistance measurement
1. Remove rear shroud as described in Removing rear
shroud.
2.
Disconnect motor plug (3) from power module.
3. Connect digital multimeter to motor plug contacts (3)
and measure resistance between contacts.
A resistance of between 0.5 and 5 ohms indicates
a motor ready for operation. A resistance
of between 15 ohms and infinity indicates a
defective motor. High resistances are normally
caused by bad connections or worn carbon
brushes.

7.2 Testing motor brake

This test should only be carried out on mobility
device with conventional motor/gearbox units.
• Phillips screwdriver size 2
• Digital multimeter with resistance measurement
1. Remove rear shroud as described in Removing rear
shroud.
2.
Pull motor plug (3) out of power module.
3. Connect digital multimeter to central motor plug
contacts (3) and measure resistance between contacts.
4. If there is a defect, replace motor and send it to Invacare
Service for inspection or repair.
A resistance of between 40 and 80 ohms
indicates an intact brake. A resistance of 0 ohms
or a very high resistance (mega-ohms or infinity)
indicates a short-circuit, a bad connection or a
defective brake.
CAUTION!
Risk of damage to power module due to shorts
in motor brake
– NEVER connect a motor brake with a short to
an intact power module.
– Always replace shorted brakes immediately.
1577880-C
A defective motor can damage the power module,
but not the other way around.

7.3 Rain test

• Check to ensure that the black battery terminal caps
are secured in place, joystick boot is not torn or
cracked where water can enter and that all electrical
connections are secure at all times.
• Do not use the mobility device if the joystick boot is
torn or cracked. If the joystick boot becomes torn or
cracked, replace immediately.

7.4 Field load test

Old batteries loose their ability to store and release power
due to increased internal resistance. In this procedure,
batteries are tested under load using a digital voltmeter to
check battery charge level at the charger connector. The
charger connector is located on the remote. When voltage
at the output drops 1.0 volts under load (2.0 for a pair),
replace the batteries.
Read these instructions carefully and the
manufacturer's instructions on the digital voltmeter
before proceeding.
1. Switch the electronics OFF on the remote.
2. Make sure battery is fully charged. An extremely
discharged battery will exhibit the same symptoms as a
bad battery.
3. Remove the footboard/legrests from the mobility device.
4.
Connect the voltmeter leads to the charger connector
A on the mobility device. Most digital voltmeters B
are not affected by polarity. However, analog meters
(meters with swinging needles) can be and should be
used carefully.
A good meter reading should be 25.5 to 26 VDC
with the chair in neutral.
WARNING!
– When performing the remaining steps, ensure
your feet are clear from casters and wall,
otherwise injury may result.
5. Run the mobility device in neutral for at least 2 minutes.
6. Sit in mobility device and place your feet against a door
jam, workbench or other stationary object.
Testing
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