5 Testing
5.1 Testing Motor
•
Phillips screwdriver, size 2
•
Digital multimeter with resistance measurement
1.
Remove shroud that covers power module. See
.
2.
Unplug cable of motor
A
from power module.
3.
Connect multimeter
B
to motor plug contacts
C
and
D
and measure resistance between contacts.
A resistance of between 0.5 ohms 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.
Fig. 5-1 DuraWatt motor serves as an example.
5.2 Testing Motor Brake
This test should only be carried out on mobility device with conventional motor-gearbox units.
CAUTION!
Risk of damage to power module due to shorts in motor brake
– NEVER connect a shorted motor brake to an intact power module.
– Always replace shorted brakes immediately.
A defective motor can damage the power module, but a defective power module cannot damage the motor.
•
Phillips screwdriver, size 2
•
Digital multimeter with resistance measurement
1.
Remove shroud that covers power module. See
.
2.
Unplug cable of motor
A
from power module.
3.
Connect multimeter
B
to motor plug contacts
E
and
F
and measure resistance between contacts.
A resistance of between 40 ohms 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.
4.
If there is a defect, replace motor and send it to
Invacare Service for inspection or repair.
Fig. 5-2 DuraWatt motor serves as an example.
5.3 Rain test
•
Check to ensure that the black battery terminal caps are secured in place, gaiter 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 gaiter is torn or cracked. If the gaiter becomes torn or cracked, replace
immediately.
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