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7.1 List of Fault and Alarm Information
E5−H serial inverter is equipped with complete protection functions to provide efficient protection while
utilizing its performance sufficiently. Some failure instructions may be displayed during operation.
Compare the instructions with the following table and analyze, decide the causes and solve failures.
For damages on units or questions that can't be resolved, please contact with local distributors/agents,
service centers or manufacturer for solutions.
Failure
Failure
No.
code
description
Over current
protection when
1
E.oc1
acceleration
operation
Over current
protection when
2
E.oc2
deceleration
operation
Over current
protection when
3
E.oc3
operation with
constant speed
Over voltage
protection when
4
E.oV1
acceleration
operation
Over voltage
protection when
5
E.oV2
deceleration
operation
Over voltage
protection when
6
E.oV3
operation with
constant speed
Interference
7
E.PCU
protection
Abnormal
comparison
8
E.rEF
benchmark
E5−H High Performance Universal Inverter
Chapter 7 Fault Diagnosis
Failure
Low grid voltage
Startup too fast during motor operation
Rotating inertial of load is very large and shock
load is very heavy
Improper setting of motor parameters
Set start−up frequency too high
Acceleration time is too short
Set V/F curve ratio too large
Power level of inverter is small
Low grid voltage
Too big rotating inertial of load
Improper setting of motor parameters
Deceleration time is too short
Power level of inverter is small
Sudden change of load during operation
Improper setting of motor parameters
Power level of inverter is small
Motor short to ground
Abnormal input power supply voltage
Fast start−up again when motor operates with
high speed
Motor short to ground
Too big rotating inertial of load
Deceleration time is too short
Motor short to ground
Abnormal input power supply
Too big rotating inertial of load
Severely Interfered by exterior signal
Loose connection of connectors inside the
inverter
Abnormal internal switching power supply
Abnormal signal sampling and comparison
circuit
Chapter 7 Fault Diagnosis
Potential causes
User Manual
Solutions
Check input power supply
Restart after the motor stops
rotating
Increase the acceleration time
and reduce the occurrences of
sudden change of load
Set motor parameters properly
Decrease start−up frequency
Prolong acceleration time
Adjust V/F curve setting and
torque boost
Replace with inverter with proper
model
Check input power supply
Choose appropriate energy
braking components
Set motor parameters properly
Prolong deceleration time
Replace to inverter with proper
model
Decrease load's abrupt
frequency change and amplitude
Set motor parameters properly
Replace to inverter with proper
model
Check motor wiring
Check input power supply
Start again after the motor stops
rotating
Check motor wiring
Choose appropriate energy
braking components
Prolong deceleration time
Check motor wiring
Check input power supply
Choose appropriate energy
braking components
Ask professional technicians to
maintain
Ask professional technicians to
maintain
Seek for technical support
Seek for technical support
107
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