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TEST RESULT 2° TEST RESULT 3° TEST RESULT
FAULT
DESCRIPTION
AT POINT
AT RUNNING REQUEST
THE TFR CLOSES FOR
0.3sec?
YES
→ → → →
A4
A5
NO
WHEN THERE'S THE
RUNNING REQUEST, IS
THERE A VOLTAGE AT PIN
BTFR FOR A TIME OF
0.3sec?
YES
CHECK WITH AN
OHMMETER OF THE TFR
COIL IS INTERRUPTED
YES B4
NO
B5
B6
NO
→ →
C4
A4) There is not a good contact on the NA of TFR, clean the contact, if it is too
much damaged replace the contactor.
A5) Missing the positive cable on the braking contactor.
B4) Replace the contactor coil or the complete contactor.
B5) Contactor mechanically locked, unlock it and replace it.
B6) Contactor with working nominal voltage bigger than the feeding one.
C4) Supply doesn’t come up to the contactor coil, please check the cabling and
the connections from the coil to the connector C1(PTFR) and C5(NTFR).
4) DIR.CON.CLOSED
Test carried out during the passage to standby or braking.
Checks that the running contactor opens by comparing the consistent status of the
VMN potential. Possible causes:
a) Running contactor stuck or slow to open.
b) Logic failure.
H2B diagnosis traction
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