48
Short circuit
of key switch
At start-up stage, if controller detects that there is low
logic level signal when key switch is off, there is a fault.
Fault analysis: Most possibly is that the voltage is
excessively low, suggest to check the followings :
(1) If the key switch is based on external load (e.g. the
starting of DC-DC converter, the input signal of relay or
contactor switch is lower than starting voltage).
(2) Check the positive and negative poles of power cable
and cell end and the connection between –BATT and
+BATT of main contactor and controller. It must be
connected with screw and the torsion scope is
13NM~15NM..
(3) If no voltage drop has been detected on the power
supply line, the fault signal is produced every time when
the key switch is on. The fault may be possibly in the
hardware of the controller; therefore, the controller needs
to be changed.
Short circuit
of power
MOS
Software will check the power bridge before main
contactor is closed: It converts into low-end power of
MOS and the phase voltage value drops to –BATT (rise to
+BATT). If the change of phase voltage value does not
conform to the instruction, this fault signal is produced.
Change the controller.
The fault signal is produced when A/D of all analog
signals is converted into a fixed value and delay exceeds
400 millisecond. This function is used to check the fault
of A/D converter or analog signal conversion.
Fault analysis: Change the controller if the fault always
exists.
During startup, the feedback value of high end voltage of
VMN is not at about 2.5V. The circuit of controller is
damaged.
Fault analysis : The following checks are suggested:
(1) Internal connection of motor.
(2) Power cable connection of motor.
(3) Drain current between motor and vehicle casing.
(4) If the motor connection is good, the problem is inside
the controller and changes it.
Driver short circuit of safety output.
Fault analysis: Check if there is short circuit or Low
impedance push-pull output betweenA19 and -BATT. If it
is the circuit trouble of driver of logic card, change the
controller.
Before driving the coil of main contactor, controller tests
MOS driver or the auxiliary output drive is the invalid
watchdog circuit signal. If it is not driven, there produces
a fault signal.
Fault analysis: Change the controller.
When key is switched on, the program is a positive value
in flash memory and the fault signal is produced in case of
negative value.
Fault analysis: The problem is on flash memory of
microcontroller. The flash memory may be damaged or
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