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Code
Description
28-DRV_VHI
VMN HIGH
CONTACTOR
37-C1 CLOSE
CLOSED
CONTACTOR
38-C1 OPEN
OPEN
52-M2_AMP_LOW PUMP I=O EVER
53-M2_AMP_HI
STBY I HIGH
CAPACITOR
60-CTRL_ERR
CHARGE
SJ12 E, SJ16 E, SJ20 E
Cause
Cause 1
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.
Cause 2
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.
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
capacitors voltage does not decrease by
more than a certain percentage of the
key voltage, the alarm is raised.
The LC coil is driven by the controller,
but it seems that the power contacts
do not close. In order to detect this
condition the controller injects a DC
current into the motor and checks the
voltage on power capacitors. If the
power capacitors get discharged it
means that the master contactor is open.
While the pump motor is driven, the
current feedback is constantly stuck to
zero.
In standby, the sensor detects a current
value different from zero.
When the key is switched on, the inverter
tries to charge the power capacitors
through the series of a PTC and a power
resistance, checking if the capacitors
are charged within a certain timeout. If
the capacitor voltage results less than a
certain percentage of the nominal battery
voltage, the alarm is raised and the
master contactor is not closed.
Section 5 – Procedures
Troubleshooting
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 alarm occurs while the motor is
running, check:
motor connections;
▪
that the LC power contact
▪
closes properly, with a good
contact.
If the motor connections are OK, the
problem is within the controller, it is
necessary to replace it.
It is suggested to verify the power
contacts of LC; if they are stuck, it is
necessary to replace the LC.
LC contacts are not working. Replace
the LC. If LC contacts are working
correctly, replace the controller
Check the continuity of the motor
connections. If good, replace the
controller
The current sensor or the current
feedback circuit is damaged. Replace
the controller.
Replace controller.
241914ACA
127
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Table of Contents
Troubleshooting
