Invacare Pronto M71 Service Manual page 25

SYMPTOM
Damaged connector or worn
brushes.
Motor chatters or
Bad motor or gearbox
runs erratically, or
only one motor
turns.
Controller malfunction.
Wheelchair veers Uneven tire pressure.
to the left or right Motors out of balance.
when driving on
level surface.
E09/E10 error code Bad motor connection.
will not go away. Bad brake coil.
Bad seal around drive shaft
Gearbox is leaking
Fluid.
Loose hardware.
Bad bearing in motor or gearbox.
Excessive clicking
coming from
Loose wheel hardware.
motor/gearbox.
Gearbox shaft Rough driving.
movement or bent
shaft.
Poor connection or worn brushes.
Motor Stutters.
Motor Fails to start Battery voltage is too low.
after initial installa- Bad Connection
tion. Brake Disengaged
Heavy load on the motors forcing
controller into the current rollback
mode.
Blown fuse in battery wiring
harness.
Motor is running
Damaged Motor
then fails to restart
when stopped.
Controller power stage board or
relays may be damaged.
Controller senses heavy load and
Motor runs but
has entered the current rollback
loses power.
mode.
Bad Connection on wheelchair
Wheelchair loses all
power while
driving.
Part No 1118377
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SECTION 3—SAFETY INSPECTION/TROUBLESHOOTING
PROBABLE CAUSE
25
SOLUTIONS
Ohm out motors. Check brushes and replace
brushes if necessary. Replace motor or gearbox if
high reading is present. Normal reading is 0-5
Ohms.
Check for error codes with programmer. Refer to
electronics manual, part number 1114808.
Inflate tires
Replace tires if worn.
Use programmer to balance motors
Check all connections. Ohm out each brake coil.
Normal reading is 45-50 Ohms.
If seal is bad, replace motor or gearbox. Remove
motor brushes and inspect for grease contamina-
tion. Replace motor or gearbox if contamination
is found.
If loose hardware is found retighten hardware.
Replace motor or gearbox.
Tighten hardware, (use removable Loctite™on
hardware). Follow torque settings in this manual.
Replace motor or gearbox.
Check motor connectors. Check brushes and
replace if necessary.
Check batteries and recharge if necessary.
Check connector
Engage brake
Leave power ON and allow controller to count
down, and recharge the wheelchair overnight with
power ON.
Replace battery wiring harness.
Replace brushes if necessary, or replace motor or
gearbox if internal damage is determined.
Ohm out motor to check for possible internal
damage (worn out brushes may be possible).
Replace controller or send to Invacare for repair.
Stop driving and let electronics cool.
Turn power "OFF", wait 10 seconds and turn
power back "ON".
Check Joystick connection
Check Battery connection and fuses
Pronto® M71™