4-8 LX31/41 Electric Work Platform
T
R O U B L E S H O O T I N G
Section
4.8
4.8 MOS90 F
AULT
F
INDING
F
LOW
C
HARTS
At battery connection, the LED should not illuminate.
At key ON, the LED should illuminate steadily. If the
LED illuminates and remains steady, but no drive can
be selected, the calibrator can be used to test the
wiring harness.
Check that both directions are not selected.
Check direction switches and wiring. Use
calibrator test mode and check Fwd/Rev/Lift
switch inputs and wiring.
Rectify
Replace MOS90 Controller
3 Flashes
- Point "A" less than 7V in
neutral, or less than 7V for
15mS in drive, or contactor coil
shor t circuit.
- Drive inhibited.
- Recycle to neutral to
clear.
NOTE: If recycling to neutral does not clear the
fault, then the fail-safe is due to a S/C contactor
coil and the keyswitch must be recycled (and the
coil replaced).
Check power and control wiring for shorts
Rectify
Replace Controller
1 Flash
- Power up/Fail-safe Fault
- EEPROM data corrupted on
key
Fault appears at key switch on.
Replace MOS90 Controller
2 Flashes
- Procedure Fault
- Illegal Star tup Sequence.
Two directions selected
together, direction and lift
selected together or lift and
ground selected together
- Drive inhibited
- Flashes until fault is
cleared
Check for correct startup sequence. Was direc-
tion or lift selected at power up?
Retry
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