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- A Power failure or a Logic Failure occured in the controller.

In this case it is necessary to substituite the controller.

2) VMN HIGH

MDI-PRC Code = 31

- Cause: Before to switch the main contactor on, the SW turns on

sequencely the Bottom side Power Mosfets and expects the

phase V voltage falls to GND value. If the phase V remains

high level this alarm occurs.

- Remedy: Two possibilities:

- At least a motor phase is not connected to the controller

or broken.

- A Power Failure (e.g. a Bottom side Power Mosfet

opened) or a Logic Failure occured in the controller.

In this case it is necessary to substituite the controller

3) VMN LOW

MDI-PRC Code = 30

- Cause: Before to switch the main contactor on, the SW turns on

sequencely the Top side Power Mosfets and expects the phase

V voltage increases toward the rail capacitor value. If the phase

V does not increases this alarm occurs.

This alarm may occur also when the initial diagnosis is

overcome, and so the Main Contactor is expected to be

closed.Then, when the operator asks the truck moving but the

+Batt terminal of the controller is lower voltage than the Battery

voltage, this alarm occurs (Main Contactor has lost the

contactation although it is closed).

- Remedy: If the problem occurs before the Main Contactor closes,

probably a Power failure (e.g. a Bottom side Power Mosfet

short circuited or a Top side Power Mosfet broken) or a Logic

Failure occured in the controller. If the problem occurs when the

operator turns the truck moving the problem is the Battery

positive is not connected to the +Batt terminal of the controller

(check the continuity of the main contactor).

If the problem occurs permanently it is necessary to substituite

the controller.

14.1.4 Four Blinks Alarms

1) VACC NOT OK

MDI-PRC Code = 78

- Cause: The test is made at key-on and after 20sec that both the travel

demands have turned disactive. This alarm occurs if the

ACCELERATOR reading in the TESTER menu’ is higher than

1.0V (it means the wiper of the potentiometer is higher than

2Vdc) when the accelerator is released.

- Remedy: Check the mechanical calibration and the functionality of the

potentiometer.

2) PEDAL WIRE KO

MDI-PRC Code = 86

- Cause: The SW continuously checks for the connection of the two

supply ends of the potentiometer in the accelerator. The test

consists of reading the voltage drop on a sense diode,

connected between NPOT (CNB#11) and GND and cascaded

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 72 73

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