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