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Chapter 6 Crane specialinverter faults and troubleshooting
6.1 Fault Display
Fault
Fault
num
Code
ber
Over current
protection when
1
E.oc1
acceleration
operation
Over current
protection when
2
E.oc2
deceleration
operation
Over current
3
E.oc3
protection when
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
8
E.rEF
comparison
benchmark
9
E.AUt
Auto−tuning failure
34
high performance crane special inverter User Manual
Fault
Possible Causes
Description
Low grid voltage
Startup during motor free rotation
Rotating inertial of load is too large or
shock load is too heavy
Improper setting 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
Rotating inertial of load is too large
Improper setting motor parameters
Deceleration time is too short
Power level of inverter is small
Sudden change of load during
operation
Improper setting motor parameters
Power level of inverter is small
Motor short to ground
Abnormal input power supply
Startup during motor free rotation
Motor short to ground
Rotating inertial of load is too large
Deceleration time is too short
Motor short to ground
Abnormal input power supply
Rotating inertial of load is too large
Severely Interfered by exterior signal
Loose connection of connectors
inside the inverter
Abnormal switching power supply
Abnormal signal sampling and
comparison circuit
Enabled auto−tuning function during
motor spining
Auto−tuning overtime
Chapter 6 Crane specialinverter faults and troubleshooting
Countermeasure
Check input power supply
Restart after the motor standstill
Increase the acceleration time and
reduce the sudden change of load
Set motor parameters properly
Decrease start−up frequency
Prolong acceleration time
Adjust V/F setting and torque boost
Replace inverter with proper model
Check input power supply
Choose appropriate dynamic braking
unit and braking resistor
Set motor parameters properly
Prolong deceleration time
Replace inverter with proper model
Decrease load's abrupt frequency
change and amplitude
Set motor parameters properly
Replace inverter with proper model
Check motor wiring
Check input power supply
Restart after the motor standstill
Check motor wiring
Choose appropriate dynamic braking
unit and braking resistor
Prolong deceleration time
Check motor wiring
Check input power supply
Choose appropriate dynamic braking
unit and braking resistor
Ask professional technicians to
maintain
Ask professional technicians to
maintain
Seek for technical support
Seek for technical support
Perform auto−tuning after the motor
stops to rotate
Check whether motor wirings are well
connected
Length of motor wiring within 100m
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