Troubleshooting
68
E-07 Inverter
control
power supply
overvoltage
Unwonted input voltage
Check input power supply or look
for service
E-08
Low-voltage when
running
Input voltage is too low
Check the input voltage
E-09 Inverter
overload
protection
Acc time is set to 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
Restart rotating motor
Set speed checking restart function
power source voltage is too low check power source voltage
Load is too big
Choose inverter with high-power
E-10
（
A-10
）
Motor overload
protection
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
Check the load
E-11
（
A-11
）
Motor underload
protection
The operating current of
inverter less than underload
threshold
Confirm whether the parameters
F19.08, F19.09 setting are
reasonable
load divorced from motor
Checking whether the load divorced
from motor
E-12
The input phase
lose
The three-phase input
power supply is abnormal
Check the three-phase input power
line is off or poor contact
Power supply board anomaly
Look for service from manufacturer
or agent
The control board anomaly
Look for service from manufacturer
or agent
E-13
Output phase loss
The lead from the inverter to the
motor is abnormal.
Check motor leads
Inverter three-phase output is
unbalanced while the motor is
running
Check if the three-phase winding of
the motor is balanced
The power board is abnormal.
Look for the service from
manufacture
The main control board is
abnormal.
Look for the service from
manufactur
E-14
Inverter module
protection
Inverter transient overcurrent
Refer to countermeasures for
overcurrent
Output three phase has
phase-to-phase short circuit or
ground short circuit
Rewiring
Air duct blockage or fan damage Clean the air duct or replace the fan
Ambient temperature is too high Reduce ambient temperature
Control panel connection or
plug-in loose
Check and reconnect
The output waveform is
Check wiring
ENC
