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6.5 H2B LIFTING DIAGNOSIS
Description of the alarms signalled by the diagnostic LED.
The alarm code is shown in parentheses. A detailed description is given in the section
“DECODING THE ALARMS DISPLAYED ON CONSOLE”.
1 BLINK = Logic anomaly (EEPROM DATA KO, EEPROM PAR. KO, EEPROM
CONF. KO, EEPROM OFF-LINE, CHOPPER NO CONF, WATCHDOG).
2 BLINKS = Running request on startup or error in handle/speeds sequence (INCOR-
RECT \ START).
3 BLINKS = Error on VMN test (NO FUL CONDUCTION).
4 BLINKS = Accelerator high in standby - this error inhibits machine operation (VACC
> 1 V).
5 BLINKS = Error in reading current - this error inhibits machine operation (1 HIGH AT
STAND, I=0 EVER).
6 BLINKS = Malfunctioning of the contactor driver circuit (DRIVER SHORTED, COIL
SHORTED).
7 BLINKS = Excessive temperature, greater than 80°C (TH. PROTECTION).
CONTINUOUS BLINKING (32 BLINKS) = Low battery charge, battery with < 10% of
residual charge (BATTERY).
6.5.1 Decoding the alarms displayed on console (H2B LIFTING)
1) STAND BY VMN LOW
The test is carried out in standby. If the VMN voltage is lower than 1/3 of the battery
voltage, an alarm is signalled. Possible causes:
a) Check the motor wiring to make sure it is correct.
b) Chopper broken, replace.
2) NO FULL COND.
The test is carried out in full conduction.
If, in this condition, the VMN is found to be greater than 1/3 VBATT, the diagnostic
circuit is faulty, causing a safety risk, and thus machine operation is inhibited. If the
defect persists, replace the logic.
3) TH.PROTECTION
An indication that the chopper temperature has exceeded 80°C.
The maximum current is gradually reduced, reaching 0 at a temperature of 85°C. If
the alarm occurs while cold:
a) Check the thermal sensor connection.
b) Thermal sensor failure.
c) Connection on the power interrupted (check the connector that connects the
logic to the power unit).
d) Logic failure.
H2B lifting + 3rd motor
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