Group 19, Motor Controls
SM 765, Dec ’06 CONTROL TROUBLESHOOTING • 19-3-7
Fault
Code
Fault Name Fault Description Control Troubleshooting
Action
Required
78 "VACC NOT
OK"
Warning: Accel-
erator signal
(CPOT) voltage
higher than
VAC C M I N + 1 V
While the trac-
tion enable
switch is open
MASTER • This fault indicates that the accelerator
voltage is 1volt greater than the mini-
mum value programmed by PROGRAM
VACC function.
• The potentiometer is not correctly cali-
brated.
• The potentiometer is defective.
• Use tester mode to check for voltage
change when accelerator is depressed,
should be approx 1.5volts (0.4~1.9volts
accelerator), 2.7volts (0.4~3.1volts
accelerator) of change. If not 1.5volts
(0.4~1.9volts accelerator), 2.7volts
(0.4~3.1volts accelerator) check for wir-
ing shorts, if no shorts, replace accelera-
tor. If accelerator still doesn’t change
and voltage is greater than 2.0volts
(0.4~1.9volts accelerator) & 3.2volts
(0.4~3.1volts accelerator) replace con-
trol.
Replace accel-
erator
79 "INCOR-
RECT
START
(SRO)"
Warning: Wrong
traction request
sequence This
fault indicates an
incorrect start-
ing sequence
MASTER • If SRO FUNCTION is active, every time
work is stopped the operator must put the
truck in neutral.
• If forward, reverse or seat switch is
active when key switch is turned on.
• If forward, reverse closed without seat
switch input.
• If the fault persist after checking the wir-
ing,
Replace con-
troller
80 "FOR-
WA RD +
REVERSE"
Warning: For-
ward and reverse
inputs are both
active
MASTER • Processor is continuously checking for a
request for forward and reverse at the
same time.
• Defective wiring.
• Running micro switch failure.
• Incorrect operation.
• If defect persist
Replace con-
troller
81 "TH
MOTOR
SENSOR
KO"
Warning:Motor
Master tempera-
ture sensor is out
of range
MASTER • The range of the motor temperature ana-
log sensor is always checked and a fault
is signaled if it's out of range
• When this fault occurs. The maximum
current is reduced to half and maximum
speed is reduced to 60 Hz.
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