EP Equipment 508000003143, Operation Manual, Page: 48 / 91

41
30
VMN LOW
Start-up test. Before switching the LC
on, the software checks the power
bridge: it turns on alternatively the
high-side power MOSFETs and expects
the phase voltages increase toward the
positive rail value. If one phase voltage
is lower than a certain percentage of the
rail voltage, this alarm occurs.
Motor running test. When the motor is
running, the power bridge is on and the
motor voltage feedback tested; if it is
lower than expected value (a range of
values is considered), the controller
enters in fault state.
If the problem occurs at start up (the
LC does not close at all), check:
- motor internal connections (ohmic
continuity);
- motor power-cables connections;
- if the motor connections are OK,
the problem is inside the controller;
replace it.
If the alarm occurs while the motor
is running, check:
- motor connections;
- that the LC power contact closes
properly, with a good contact;
- if no problem is found, the problem
is inside the controller. Replace it.
31
VMN HIGH
Before switching the LC on, the software
checks the power bridge: it turns on
alternatively the low-side power
MOSFETs and expects the phase
voltages decrease down to -B. If the
phase voltages are higher than a certain
percentage of the nominal battery
voltage, this alarm occurs.
This alarm may also occur when the
start-up diagnosis has succeeded and
so the LC has been closed. In this
condition, the phase voltages are
expected to be lower than half the
battery voltage. If one of them is higher
than that value, this alarm occurs.
A)If the problem occurs at start-up
(the LC does not close), check:
- motor internal connections (ohmic
continuity);
- motor power cables connections;
- if the motor connections are OK,
the problem is inside the controller.
Replace it.
B) If the alarm occurs while the
motor is running, check:
- motor connections;
- that the LC power contact closes
properly, with a good contact;
- if no problem is found, the problem
is inside the controller. Replace it.
37
CONTACT
OR
CLOSED
Before driving the LC coil, the controller
checks if the contactor is stuck. The
controller drives the power bridge for
several dozens of milliseconds, trying to
discharge the capacitors bank. If the
capacitor voltage does not decrease by
more than a certain percentage of the
key voltage, the alarm is raised.
It is suggested to verify the power
contacts of LC; if they are stuck, is
necessary to replace the LC.
Error Message
Possible cause Fault elimination
Error
Error text