Magnet Brake; Freewheel Switch; Carbon Brushes - Invacare Electra Service Manual

Service Manual

11.2.2 Magnet brake

•
Remove drive unit panelling (see chapter 9.3 page: 19).
•
Remove the drive unit connecting plug at the controller (3).
•
Engage motors.
•
Set the Multimeter to resistance measuring.
•
Measure the continuity or resistance (R
circuit between the grey and white cable on the motor plug.
Test results:
R = 0 Ω.
R > 200 Ω, but < ∞.

11.2.3 Freewheel switch

•
Remove drive unit panelling (see chapter 9.3 page: 19).
•
Remove the drive unit connecting plug at the controller (3).
•
Disengage motors.
•
Set the Multimeter to resistance measuring.
•
Measure the braking coil resistance (R
white cable in the motor plug. The measured value must be infinite.
Test results:
R < ∞.

11.2.4 Carbon brushes

•
Remove drive unit panelling (see chapter 9.3 page: 19).
•
Remove the drive unit connecting plug at the controller.
•
Remove carbon brushes (2) (see chapter 9.6.4).
•
Measure the length (L)
Original length = 18 mm.
Wear limit = 15 mm.
Check the running surface. Only very slight running traces must be noticeable.
If the running surface shows deep grooves, the motor collector is damaged.
Overhaul of the motor collector can only be carried out by
Test results:
L < 15 mm
Running surface
shows deep scores
As at: 15.04.02
= 20 Ω) of the brake coil motor
req
•
Short-circuit in
magnetic brake.
•
Fine short circuit in
magnetic brake.
= ∞ Ω) between the grey and
req
•
Short-circuit in
magnetic brake.
•
Wear limit exceeded
•
Motor collector
damaged
Invacare
Þ Replace drive unit.
Þ Replace drive unit.
Þ Replace drive unit.
®
Invacare
.
Þ Replace carbon
brushes
Þ Replace drive unit
Page 33
®
Electra
Drive unit connector
plug
Chapter:
Chapter: 9.6.5 page: 24
Chapter: 9.6.5 page: 24
Drive unit connector
plug
Chapter:
Chapter: 9.6.5 page: 24
Carbon brushes
Chapter:
Chapter: 9.6.4 page: 24
Chapter: 9.6.5 page: 24