ACD320user manual
Fault Diagnosis and countermeasures
U-11
Motor overload
Improper V/F curve
power source voltage is too low
General motor run at low speed with big
load
motor overload protection factor set
incorrectly
Adjust V/F curve and torque boost
check power source voltage
Can choose frequency conversion
motor for long time low speed run
to set motor overload protection
factor correctly
failure
code
failure type
motor blocked up or load change too
suddenly and quickly
possible reason
U-12 Missing input phase Three-phase input power is abnormal
Reduce the load and check the
motor and
countermeasure
Check and remove the problems
in the peripheral lines,To make
the three-phase power entering
the frequency inverter normal
U-13
U-14
Missing output phase
The lead wire from inverter to the motor
is abnormal.
Check if the three-phase output of
frequency inverter is balanced when
running without motor
Air-path blocked
inverter over heating Ambient temperature is too high
Fan damaged
Remove peripheral fault.
Check if the motor three-phase
winding is normal, If no, remove
the fault.
To clear air-path or improve
ventilation condition
Improve ventilation condition,
lower carrier frequency
Replace the fan
use sudden stop key in
run mode
non-keypad Reset running
U-15
external device
failure
Use sudden stop key
condition of stall
under
Set running parameter correctly
Sudden stop terminal MI for external
failure closed
Open external failure terminal
after external failure is settled
U-16
RS485
communication
failure
Baud rate set improperly
- 112-
set Baud rate properly
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