Clark GEX20 - Page 160

Group 19, Motor Controls
19-3-10 • CONTROL TROUBLESHOOTING SM 765, Dec ’06
Fault
Code
Fault Name Fault Description Control Troubleshooting
Action
Required
110 "VMN
HIGH"
Wrong voltage on
motor power out-
puts; failure in the
power section or
in the mosfet
driver circuit or in
the motor
SLAVE • This test is carried out during initial diag-
nosis and in standby. Possible causes:
• Problem with motor connections or the
motor power circuit; check if the 3
phases are correctly connected; check if
there's chassis ground of the motor to
truck frame.
• Unhook battery at controller and do a
diode check between Batt + and Batt -
(should read .3 to .5 volts)
• Fault in the controller power section.
Replace con-
troller
132 "STBY I
HIGH"
Wrong voltage in
current sensor
feedback circuit
SLAVE • The microprocessors verify if the feed-
back of current sensor device output is
within the zero current window. Possible
causes for the fault.
• Current sensor failure.
• Failure in the controller
• If the fault persist.
Replace con-
troller
Replace the
power unit
139 "CAPACI-
TOR
CHARGE"
Power Capacitor
Voltage does not
increase when the
key is turned ON;
failure in power
section, or in
Logic PCB, or in
driver PCB, or in
the motor
SLAVE • When key is switched on, the inverter
tries to charge the capacitors through a
power resistor, and check if the capacitor
is charged (1/2 battery volts) within a
timeout. If they do not charge, an fault is
signaled; the line contactor does not
close.
• The charging resistor is open
• The charging circuit has a failure
• There is a problem in the power section.
• Possible Motor connection open.
140 " HIGH
TEMPERA-
TURE"
Warning: Mas-
ter or Slave or
both tempera-
ture higher that
75 degrees C
SLAVE • Temperature of control is greater than
75°C. Maximum current reduced propor-
tionally to the temperature increase. At
100°C the maximum current of both con-
trols is reduced to zero.
148 "ENCODER
ERROR"
Motor speed sen-
sor (encoder) does
not work properly
SLAVE
• This fault indicates that the frequency
supplied the motor is greater that 20 Hz,
and the signal feedback from the encoder
has a jump higher than 20 Hz in less than
ten milliseconds. This condition clearly
shows a malfunctioning of the encoder
signal.
• Check encoder wiring; if no fault is
found in the wiring.
Replace
encoder