V&T Technologies Co., Ltd.
http://www.ecodrivecn.com
Chapter 7 Fault Diagnosis
122
Failure No.
Failure code
Failure description
Potential causes
Solutions
6
E.oV3
Over voltage
protection when
operation with
constant speed
Motor short to ground
Check motor wiring
Abnormal input power
supply
Check input power supply
Rotating inertial of load is
too large
Choose appropriate energy
braking components
7
E.PCU
Interference
protection
Severely Interfered by
exterior signal
Ask professional technicians to
maintain
8
E.rEF
Abnormal
comparison
benchmark
Loose connection of
connectors inside the
inverter
Ask professional technicians to
maintain
Abnormal internal
switching power supply
Seek for technical support
Abnormal signal sampling
and comparison circuit
Seek for technical support
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
