controller detects that the key
hole input voltage is too low. For
36/48v controller, the
low-voltage critical value is 11V.
For an 80V controller, the low
voltage critical value is 30V.
startup of the key switch, it
may be caused by external
load, such as dc-dc startup,
relay, solenoid valve switching
on and off, etc. It is
recommended to remove these
external loads before trying
again;
2. If the voltage transient
condition is not detected on the
power supply line, but the
failure always appears every
time Restart the key switch,
then there may be a problem
inside the controller. It is
recommended to replace the
controller.
3. If this fault occurs during
driving, it is recommended to
check the condition of the
battery, the connection of
positive and negative power
lines and so on.
Case 1: this fault occurs when
starting the key: before closing
the main contactor, the software
will detect the power bridge and
alternately open the MOS tube
high-end, and expect the phase
voltage to increase to the value
of the positive mainline voltage.
If the voltage of one phase is
lower than 66% of the mainline
voltage, this fault will occur.
Case 2: This fault occurs during
operation: when the motor is
running, the power bridge is
closed and the motor phase
voltage feedback is completed. If
the phase voltage is lower than
expected, this fault will occur
Case 1 solution:
the coil of the main contactor
is not closed in this case, please
check:
(1) internal connection of the
motor (resistance connection);
(2) whether the motor wire is
well connected;
(3) if there is no external
problem and the motor wire is
well connected, the problem
may appear inside the
controller, it is recommended to
replace the controller;
Case 2 solution:
(1) check whether the motor
wire is well connected;
(2) check whether the contact
of the main contactor is good;
(3) if there is no external
problem and the motor wire is
well connected, the problem
may appear inside the
controller. It is recommended
to replace the controller
Case 1: the failure occurs when
start the key: before closing the
main contactor, the software will
detect power bridge, and open
the MOS tube low-end
Case 1 solution:
In this case, the main contactor
coil is not closed, please check:
(1) internal connection of the
motor (continuity of
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