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2) STBY I HIGH

MDI-PRC Code = 53

- Cause: This diagnosis is executed only when the main contactor is

opened and asked to be closed (e.g. at key on or when the

main contactor is opened and a new motion request turns

active). Then the outputs of the Current amplifiers must be in a

narrow window close to 2.5Vdc (from 2.26V to 2.74V).

Otherwise this STBY I HIGH alarm occurs.

- Remedy: If the alarm occurs permanently, it is necessary to substituite

the controller.

14.1.6 Six Blinks Alarms

1) COIL SHORTED

MDI-PRC Code = 76

- Cause: This alarm occurs when there is an overload on one of the

following connections: CNA#1, CNA#3, CNA#4 and CNA#6.

Typically the problem is due to a short circuit of one of the coils

conneted to these outputs. After the overload has removed, the

alarm exits automatically by releasing and then enabling a

travel demand.

- Remedy: Check the coils of the main contactor (CNA#1), of the

electromechanical brake (CNA#3), of the pump contactor

(CNA#4), of the Aux valve (CNA#6).

2) CONTACTOR DRIVER

MDI-PRC Code = 75

- Cause: This alarm occurs when the voltage on the Main Contactor is

smaller than expected: this means that the Main Contactor Coil

has a null voltage when supplied.

- Remedy: Check the coils of the Main Contactor (CNA#1) is not short

circuited. If it isn’t, probably it is necessary to substituite the

controller because the driver of the Main Contactor is broken.

3) DRIVER SHORTED

MDI-PRC Code = 74

- Cause: This alarm occurs when the voltage on the Main Contactor is

higher than expected: this means that the Main Contactor Coil

has a high voltage although it is not supplied.

- Remedy: Probably it is necessary to substituite the controller because the

driver of the Main Contactor is short circuited.

4) AUX OUTPUT KO

MDI-PRC Code = 16

- Cause: This alarm occurs when the feedforward PWM generated by the

controller to supply the Electromechanical Brake and the actual

feedback voltage on the Electromechanical Brake are not

matched in between. The diagnosis is made only when the

Tiller Switch is active.

Then:

a) When the feedforward PWM is less than 10% of the battery

voltage, the Actual voltage on the Electromechanical Brake

is expected low. If it is higher than 14V it means the

Electromechanical Brake never Brakes the truck (probably

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