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04 LOGIC FAILURE #2
Condition for error detection
Fault in the hardware section of the logic board which manages the phase voltage feedback.
The alarm appears also if the CT2 contactor is open during operation.
Check:
• the pins 1 and 14 of connector J50 and connections P6 and P5
• the contactor coil (45 Ohm)
• check the truck insulation (see paragraph INSULATION CONTROL PROCEDURE)
• the state of the power cables connected to the motor (tightness of connections, sheath wear,
connection stapling)
• replace the logic unit.
05 LOGIC FAILURE #1
Condition for error detection
This alarm signals that the interruption of protection against under voltage /over voltage has been trigge-
red.
UNDER voltage: the logic unit controls the key input (pin 1, connector JT, cable R04 of the logic). If the
voltage has a low peak, the alarm is signalled.
OVER voltage: the logic unit controls the voltage on the internal condensers. If the voltage has a hight
peak during the braking, the alarm is signalled.
The possible reasons are:
a. Under voltage / over voltage of the battery, or loss of voltage after the ignition key or after the battery
connector.
b. If the alarm is signaled when the vehicle is switched on and it appears in combination with alarm 35 of
the lifting logic, check:
• the key switch (false contact, rusted contacts on the key cylinder)
• the battery plug-socket (false contact, damaged contacts)
• the state of the battery elements (see chapter 01 BATTERY)
c. The alarm appears also when one or more motor phases do not present a correct isolation at a move-
ment request.
• check the motor insulation (see paragraph INSULATION CONTROL PROCEDURE).
• the insulation of the power cables connected to the motor (tightness of connections, sheath wear,
connection stapling)
• check that the motor phases (U-V-W) are shorted among them (see paragraph MOTOR WINDING
CONTROL PROCEDURE)
d. Defect in the logic hardware section that controls the protection against the overvoltage.
Logic defect. Replace the logic unit.
Reference wiring diagram page 2/7 (chapter 17, section WIRING DIAGRAMS)
https://www.forkliftpdfmanuals.com/
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