SECTION 3—SAFETY INSPECTION/TROUBLESHOOTING
33
FIGURE 3.3
4-Pole Motor Brush Inspection and/or Replacement
Electro-Mechanical Parking Brake Testing
NOTE: For this procedure, refer to FIGURE 3.4.
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, contact
Invacare Technical Phone Support.
WARNING
A shorted electro-mechanical brake will dam-
age the brake output section in the controller.
DO NOT connect a shorted electro-mechani-
cal 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.
FIGURE 3.4
Electro-Mechanical Parking Brake Testing
Side View
DETAIL “A”
Motor
DETAIL “B”
4 Pole Motor
Top of Motor Brush
with Spring and Shunt
Wire
Brush Cap
Brush
Holder
Motor Brush Cap
Bottom View
Motor Brush Cap
NOTE: 4 Pole Motor Shown. 2 Pole Motor
follows same assembly pattern.
4 Pin Motor
Connector
Motor
