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V&T Technologies Co., Ltd.
http://www.ecodrivecn.com
Chapter 7 Fault Diagnosis
109
Failure
No.
Failure
code
Failure
description
Potential causes
Solutions
9
E.AUt
Auto
−
tuning
failure
Enable auto
−
tuning function during motor
spining
Perform auto
−
tuning after the
motor stops to rotate
Auto
−
tuning overtime
Check whether motor wirings are
well connected
Length of motor wiring within
100m
Incorrect setting of motor parameters in group
P9
Please reset the parameters
according to the nameplate
parameters on the motor.
10
E.FAL
Module protection
Output over current
Check whether the motor the
output connection are short
circuited, whether the ground is
short circuited and whether the
load is too heavy.
DC terminal overvoltage
Check the mains power supply
and whether the large inertia
load has no function of quick
stop at energy consumption
brake.
Loose connection of connectors inside the
inverter
Ask professional technicians to
maintain
11
E.oH1
Heatsink 1 over
temperature
protection
Ambient over
−
temperature
Lower the ambient temperature
and strengthen ventilation and
radiation.
Blockage of air duct
Clean the dusts, wools and other
foreign objects in the air duct.
Fan failure
Check whether fan wirings are
well connected.
Replace a new fan of the same
model.
Inverter module failure
Seek for technical support
Temperature detection circuit failure
Seek for technical support
12
E.oH2
Heatsink 2 over
temperature
protection
Ambient over
−
temperature
Lower the ambient temperature
and strengthen ventilation and
radiation
Blockage of air duct
Clean the dusts, wools and other
foreign objects in the air duct
Fan failure
Check whether fan wirings are
well connected.
Replace a new fan of the same
model
Rectifier module failure
Seek for technical support
Temperature detection circuit failure
Seek for technical support
13
E.oL1
Inverter overload
protection
Input power under voltage
Check input power supply
Fast start
−
up when motor operates with high
speed
Start again after the motor stop
rotating
Keep overloading for a long period of time
Shorten the overloading time and
reduce load
Acceleration and deceleration time is too short
Prolong the
acceleration/deceleration time
V/F curve ratio is set too large
Adjust V/F curve setting and
torque boost
Power level of inverter is small
Replace to inverter with proper
model