EP Equipment CQD16, Service Manual

Page: 148 / 251

REV. 07/2016
ELECTRICAL SYSYTEM
8
134
Error Message
Possible cause Fault elimination
CAPACITOR
CHARGE
When the key is switched ON, the inverter
tries to charge the capacitor through
a power resistance, and check if the
capacitor are charged within a timeout. If
this is not true: an alarm is signalled; the
main contactor is not closed.
Possible reasons:
A) the charging resistance is opened; if it
is opened.
B) The charging circuit has a failure.
C) There is a problem on the power
modules.
Replace the inverter.
VMN LOW
The test is carried out during initial
diagnosis and in standby.
Possible causes:
A) problem with the motor connections
or the motor power circuit; check if the 3
phases are correctly connected; check if
there's a dispersion of the motor towards
ground;
B) inverter failure
if the default persists, replace the
inverter.
VMN HIGH
The test is carried out during initial
diagnosis and in standby.
Possible causes:
A) problem with the motor connections
or the motor power circuit; check if the 3
phases are correctly connected; check if
there's a dispersion of the motor towards
ground;
B) inverter failure
if the default persists, replace the
inverter.
VACC NOT OK
The test is made in standby. This alarm
indicates that the accelerator voltage
is 1 V greater than the minimum value
programmed by the PROGRAM
VACC function.
Possible causes:
A) the potentiometer is not correctly
calibrated;
B) the potentiometer is defective.
T r o u b l e s h o o t i n g , t h e a l a r m i s
eliminated.
PEDAL WIRE KO
This alarm is signalled if a fault is detected
in the accelerator unit wiring (NPOT or
PPOT cable is interrupted).
T r o u b l e s h o o t i n g , t h e a l a r m i s
eliminated.
STBY I HIGH
Test carried out in standby. Check if
the current is 0. If not verified, an alarm
is signalled which inhibits machine
operations. Possible causes:
A) current sensor failure;
B) logic failure:
fi rst replace the logic; if the
defect persists, replace the power unit.
T r o u b l e s h o o t i n g , t h e a l a r m i s
eliminated.