Page 40/60 H2B USER'S MANUAL - 550145G
B1) Forward contactor (TA) is supplied with a correct voltage but it doesn’t close.
Possible causes:
1) Contactor coil is interrupted, verify its resistance using an ohmmeter.
2) Contact can’t move due to mechanic block.
3) Nominal working coil voltage is greater than battery one.
B2) Backward contactor (TI) is supplied with a correct voltage but it doesn’t close;
everything said at point B1 for TA is valid here.
B3) Backward and forward contactor are supplied with a correct voltage but they
don’t close; see point B1.
C1) Supply don’t come up to TA, please check cabling and connections from TA coil
to connectors PT and NTA.
C2) Supply don’t come up to TI, please check cabling and connections from TI coil
to connectors PT and NTI.
C3) Supply don’t come up to TA and TI, please check cabling and connections from
the coils to connectors PT, NTA and NTI.
- For points C1, C2, C3 replacing controller may be necessary.
For H2B standard configuration the solutions at point A1-A2-A3-B1-B2-B3-C1-C2-
C3 are valid; for the last two points please respect the different connections rather
than the regenerative configuration.
3) BRAKE CONT. OPEN
Test carried out during the passage to running. After closure of the running contact, the
braking contactor closes, verifying that the VMN goes from < 1/3 to > 2/3. If this does
not occur, an alarm is shown.
For finding out the causes follows the diagnosis procedure herefollowing:
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