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4 ALARMS
4.1 DIAGNOSIS
1) POWER FAILURE #1 AL 73 MDI 1 LED FLASH
Short circuit on main relay or on auxiliary outputs (NEV1, NEV2).
2) CAPACITOR CHARGE AL 60 MDI 3 LED FLASHES
This alarm is signalled if the capacitors have not begun re-charging after a certain
amount of time has lapsed.
Possible causes:
fault in the potentiometer unit.
3) DRIVER SHORTED AL 74 MDI 6 LED FLASHES
Short circuit on driver of main relay.
4) VMN NOT OK AL 32 MDI 3 LED FLASHES
Test at rest with the main relay open and running. If the VMN is very low and the
main relay is open, the chopper goes into alarm. When running, an alarm is
signalled if the VMN does not move from the half battery value according to the
direction of the duty cycle: for forward running the VMN value should go from Vbatt/
2 to zero, in reverse the VMN should go from Vbatt/2 to Vbatt.
Possible causes:
a) incorrect motor connection;
b) motor leak to earth;
c) fault in the power unit.
5) STBY I HIGH AL 53 MDI 5 LED FLASHES
Test during initial diagnosis and at rest with main relay open. Check to ensure that
current signals are nil. If not the chopper goes into alarm and prevents machine
functions.
Possible causes:
a) faulty current sensor;
b) fault in the feedback circuit, in the logic or in the power board.
6) LOW BATTERY AL 66 MDI 32 LED FLASHES
Reduces the traction current to Imax/2. The low battery alarm is activated when the
residual charge falls to 10%. If the alarm is activated with the battery fully charged,
check the battery value reading in the “TESTER” menu on the console; if the
reading is incorrect, carry out fine adjustment in the “CONFIG MENU/
ADJUSTMENT” menu. This alarm can be present only with "battery check" option
ON.
7) CONTACTOR CLOSED AL 37 MDI 6 LED FLASHES
Test before closing the main relay, only if the VMN is at approx. Vbatt/2. Check that
the contact of the main electromagnetic switch is open and has not jammed.
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