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5.5 DECODING CONSOLE DISPLAYED ALARMS
1) BRAKE CON CLOSED (only regenerative version)
Test carried out in the passage from running to initial regenerative braking.
If, on running contactor closure, the VMN is > 2/3 VBATT, an alarm is issued.
Possible causes:
a) The normally open contact of the braking contactor is stuck. Unlock the contact
and clean it; if it is too much damaged replace the contactor.
b) The braking contactor remains excited for a defect in the logic board or because
the NTFR wire is in short towards the negative.
For understanding if the defect is produced by one of these causes, select the
running and press the pedal without giving the seat or tiller request, if the activa-
tion only of the braking contactor is in synchrony with the pedal (or selector)
command verify what follows: disconnect the wire from the NTFR connector and
do again the test above, if the contactor remains disactivated replace the logic,
otherwise if the contactor moves check that there is not a wire in short with a
metallic part.
2) DIR. CONT. OPEN
Test carried out at running request: running contactor closure is verified by checking
that the VMN signal is consistent. Possible causes:
a) For finding out the causes follows the diagnosis procedure herefollowing:
CONDITION UNDER
WHICH FAULT IS
DETECTED
TEST RESULT TEST RESULT
FAULT
DESCRIPTION AT
POINT:
ONLY AT FORWARD
RUNNING REQUEST
YOU SEE FORWARD
CONTACTOR (TA) CLOSING
FOR 0.3sec. THEN OPENING?
YES → → A1
NO
WHEN REQUESTING
FORWARD RUNNING YOU
FIND ANY VOLTAGE AT COIL
CONTACTS FOR
0.3 sec.?
YES B1
NO C1
ONLY AT BACKWARD
RUNNING REQUEST
YOU SEE BACKWARD
CONTACTOR (TI) CLOSING
FOR 0.3sec. THEN OPENING?
YES → → A2
NO
WHEN REQUESTING
BACKWARD RUNNING YOU
FIND ANY VOLTAGE AT COIL
CONTACTS FOR 0.3sec.?
YES B2
NO C2
AT BOTH RUNNING
REQUEST
YOU SEE FORWARD OR
BACKWARD CONTACTOR (TA
OR TI) CLOSING FOR 0.3sec.
THEN OPENING
YES → → A3
NO
WHEN REQUESTING
FORWARD RUNNING YOU
FIND ANY VOLTAGE AT TA
COIL'S CONTACTS (OR AT
BACKWARD CONTACTOR
COIL'S CONTACTS (BTI)) FOR
0.3sec.?
YES B3
NO C3
A1) There is not a good contact either on TA (=forward contactor) NA (normally
open) or on TI (=backward contactor) NC (normally closed), due to dust, dirt
or any particles which prevent a valid contact.
Clean contacts by means of compressed air; if necessary remove dirt apply-
ing a soft abrasive movement.
H2B diagnosis traction
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