Invacare M71 service manual Electro-Mechanical Parking Brake Testing

SECTION 9—MOTORS

B.Run the motors forward for one hour.

C.Turn motors off and allow 30 minutes for motors to cool off.

D.Run the motors in reverse for one hour.

E.When process is complete, remove wheelchair from blocks and test drive the wheelchair.

NOTE: If wheelchair still does not perform properly, call Invacare Technical Service at 1-800-832-4707.

Brush Caps	Motor Brush
Commutator	Brush
(Inside Motor
Housing)
Motor
Housing

FIGURE 9.4 Replacing Internal Motor

Brushes

Electro-Mechanical Parking Brake Testing

NOTE: For this procedure, refer to FIGURE 9.5.

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.

3.Measure the resistance between the two brake contacts. A normal reading is between 40-80 ohms depending on the motor.

NOTE: A reading of 0 ohms (Ω) or a very high reading; i.e., mohms or O.L. (Open Line) indicates a shorted brake or an open connection respectively. If either condition exists, send the motor to Invacare Technical Service for inspection/repair.

WARNING

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

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

To Motor

4 Pin Motor

Connector

FIGURE 9.5 Electro-Mechanical Parking

Brake Testing

Part No 1118377 85 Pronto® M71™