H2B USER'S MANUAL - 550145G Page 43/60
D2) There is a current dispersion in the motor between the stator winding and the
armature one otherwise there are some electric parts of these windings that
makes a contact inside the motor.
D3) Check that there are not metallic parts inside the contactor board that cause a
short towards the negative in the points connected to SH- and SH+.
C5) The most probably reason is that the failure is inside the controller, replace it.
E1) If there’s the bypass contactor check that it is not stuck or it is too much slow in
opening.
For verifying this possibility, disconnect the bypass and check if the failure
disappears: if this happens, replace the logic.
PAY ATTENTION: the contactors connected to the controller must not have arc
suppressers on the contactor coils because these are inside the controller and
then the external ones modify the contactor opening times.
6) VMN HIGH
Test carried out in standby. If the VMN voltage is greater than 2/3 VBATT, an alarm is
shown. Possible causes:
a) Contactor stuck (only standard traction).
b) Short circuit between +BATT and VMN, please check if there are any metallic parts
causing short circuit in the contactor board.
c) Logic failure, probably the braking diode are broken, replace the power.
7) 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.
8) THERMAL PROTECTION
An indication that the controller temperature has exceeded 79° C.
The maximum current is gradually reduced, reaching 0 at a temperature of 90° C.
a) If the alarms occurs while cold, the most probably reason is the failure of the thermic
diagnosis circuit on the power or on the logic board, replace on of the two parts or
replace the complete controller.
b) If the alarm often occurs after short time the machine is working, probably it is due to
inadequate heat sink, check the fixing nuts tightening and the correct installation.
9) BATTERY LOW
The battery charge is low.
The alarm is signalled only if the “battery check” option has been selected from the
serial console (default). When this alarm occurs, the maximum current is reduced to
50%.
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