Invacare Arrow FWD Motor Brush Inspection Figure, ELECTRO-MECHANICAL Parking Brake Testing Figure

TROUBLESHOOTING PROCEDURE 2

Ohmmeter

Motor Connector

FIGURE 3 - MOTOR TESTING

MOTOR BRUSH INSPECTION (FIGURE 4)

NOTE:Thisprocedureshouldonlybeperformedonwheel- chairs with conventional motor/gearbox assembly.

There are two (2) contact brushes on ACTION STORM mo- tors located under the brush caps on the motor housing. If thesecapsarehardtoremovetheyareeitherovertightenedor the motor has become very hot. Let motors cool. If caps still cannotberemoved,itisrecommendedthatthemotorbesent toInvacareTechnicalServicesforinspection/repair.

NOTE: It is very important to note which way the brush comes out of the motor. The brush MUST be placed into the motor exactly the same way to ensure good contact with the commutator.

1.Once the motor brush caps have been removed, pull the brushes out of the motor. The end of the brushes should be smooth and shiny and the spring should not be damaged or discolored. If one or both of the brushes are damaged, only the damaged or worn brushes need be replaced. It is very important that any time a brush is replaced, it must be “burned in”. This is accomplished by running the motor for one hour in each direction with a half hour break in-be- tween. This should also be done with little or no load on the motor, i.e., put the wheelchair up on blocks so the drive (large) wheels do not contact the ground and run the wheelchair. A motor with only one brush replaced will only carry a small percentage of its rated load capacity until the NEW brush is burned in.

Cap

Motor

4 Pin Motor Connector

FIGURE 4 - MOTOR BRUSH INSPECTION

ELECTRO-MECHANICAL PARKING BRAKE TESTING (FIGURE 5)

NOTE: This procedure should only be performed on wheelchairs with conventional motor/gearbox assembly.

1.On the four-pin motor connector, locate the side by side connectors in the black housings.

2.Set the digital multimeter to read ohms (Ω).

3.Measure the resistance between the two (2) brake con- tacts. A normal reading is 100 ohms (Ω). A reading of 0 ohms (Ω) or a very high reading; i.e., MEG ohms or O.L. (outoflimit)indicatesashortedbrakeoranopenconnec- tion respectively. If either condition exists, send the motor toInvacareTechnicalServiceforinspection/repair.

CAUTION

A shorted electro-mechanical brake will damage the brake output section in the con- troller. DO NOT connect a shorted electro- mechanical brake to a good controller mod- ule. A shorted brake MUST be replaced.

NOTE: A bad motor can damage the controller module but a bad controller will NOT damage a motor.

Cap Motor

4 Pin Motor Connector

Ohmmeter

FIGURE 5 - ELECTRO-MECHANICAL

PARKING BRAKE TESTING

T R O U B L E S H O O T I N G

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