ACD320user manual
Fault Diagnosis and countermeasures
U-05
overvoltage during
accelerating
process
input voltage is a bitter high
There is external force driving the motor
in accelerating process.
Accel time is set to too short
Check input power supply
Cancel this force or addbraking
resistor
Prolong accelerating time properly
Restart rotating motor
Set to be speed tracking starting
Input voltage is too high
Check input power supply
U-06
Overvoltage
during
decelerating
process
There is external force driving the motor
in decelerating process.
Decelerating time is too short
Have potential energy load or big inertia
load
Input voltage is too high
Cancel this force or addbraking
resistor
Prolong decelerating time
Increase braking power of external
energy consumption braking
subassembly
Check input power supply
U-07
Overvoltage
during constant
speed process
There is external force driving the motor
in operating process.
Accel/Decel time is set to too short
Input voltage change abnormally
Cancel this force or addbraking
resistor
Prolong accelerating decelerating
time properly
Assemble reactor
Load inertia is a bit big
Use energy consumption
subassembly
U-08
U-09
Control power
failure
Unwonted input voltage
Under voltage
failure
transient power off
Input voltage is too low
Check input power supply or look
for service
Reset falure.
Check input power supply
Accel time is too short
Prolong accelerating time
DC injection braking is too big
Reduce DC injection braking
current.prolong braking time
Improper V/F curve
Adjust V/F curve and torque boost
U-10
Inverter overload
Restart rotating motor
power source voltage is too low
Set to be speed tracking starting
check power source voltage
Load is too big or motor is blocked.
Reduce the load and check the
motor and macine.
Power of inverter is a bit small
Choose inverter with high-power
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