HELI CQD16X1, Operation & Service Manual

Page: 82 / 105

78
232 SHORTED short circuit logical level signal when the key switch is open, the
fault occurs.
Fault analysis: it may be caused by low voltage.
- Key switch is based on outside load (such as the
start of DC-DC converter; the input signal of relay
or contactor is lower than start voltage.)
- Check the connection between the power cable
and battery positive and negative pole and the
connection between the main contactor and
controller’s -BATT
、
+BATT. Connect with screw
and the tighten torque is 13Nm÷15Nm.
- If pressure drop is not detected on electric supply
circuit, fault will occurs each time when the key
switch is on. Fault may occur on controller
hardware, change the controller.
2
233
POWER MOS
SHORTED
Power MOS
short circuit
Before the main contactor is closed, the software will
check the electric bridge and convert it to MOS lower
end power and the phase voltage is reduced to -BATT
（
increase to +BATT
） ，
if the change of phase voltage
disagrees with instruct, fault occurs and change the
controller.
2
237
ANALOG INPUT Analog signal
input fault
When A/D input by all analog signal is converted into a
fixed value, the fault occurs. Delayed time exceeds
400 millisecond. The fault is used to detect A/D
converter fault or analog signal conversion.
Fault analysis: if fault exists all the time, change the
controller.
2
238
WRONG
ZERO VOLTAGE
Zero voltage
fault
VAM high terminal voltage feedback voltage is very
higher or lower than 2.5V, that means the controller
circuit is broken.
Check the following items:
Motor inner side connection
Motor power cable connection
Drain current between motor and truck external case
If motor is well connected, the interior of the controller
has fault, change the controller.
2
239
SAFETY
OUTPUT
Safety output
fault
Safety output drive short circuit
Check if there is short circuit between A19 and –BATT
or low impedance discourages output. Logic card
driver’s electric circuit has fault. Change the controller.
2
240
HARDWARE
FAULT
Hardware
electric circuit
fault
Before driving main contactor coil, the controller
detects MOS drive or auxiliary output drive is invalid
watchdog electric circuit signal. If it is not driven, fault
occurs.