EP Equipment CPD30L1-B, Service Manual

Page: 148 / 235

REV. 05/2020
ELECTRICAL SYSTEM
9
136
Error Message
Possible cause Fault elimination
Error
Error text
31 VMN HIGH
Cause1:
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
-BATT. If the phase voltages are
higher than 10% of the nominal
battery voltage, this alarm occurs.
Cause2:
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.
- If the problem occurs at start-up
(the LC does not close), check:
o motor internal connections
(ohmic continuity);
o motor power cables connections;
o if the motor connections are OK,
the problem is inside the controller.
Replace it.
- If the alarm occurs while the
motor is running, check:
o motor connections;
o that the LC power contact closes
properly, with a good contact;
o if no problem is found, the
problem is inside the controller.
Replace it.
30 VMN LOW
Cause1:
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 below 66% of the rail
voltage, this alarm occurs.
Cause2:
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:
o motor internal connections
(ohmic continuity);
o motor power-cables connections;
o if the motor connections are OK,
the problem is inside the controller;
replace it.
- If the alarm occurs while the
motor is running, check:
o motor connections;
o that the LC power contact closes
properly, with a good contact;
o if no problem is found, the
problem is inside the controller.
Replace it.
227
HW FAULT
11/12/13
At each start-up the supervisor
micro-controller checks that the
hardware circuit intended to enable
and disable the LC driver (A16)
works properly.
This type of fault is not related to
external components. Replace the
logic board.
227
HW FAULT
01/02/03
At each start-up the supervisor
micro-controller checks that the
hardware circuit for enabling and
disabling of the power bridge works
properly.
This type of fault is not related to
external components. Replace the
logic board.