STEP ET Series - Page 153

Chapter 8 Troubleshooting
ET/EP/EH Series Intelligent Flexible Driver Manual
- 143 -
Error
code
Fault display
Possible causes
Countermeasures
inverter
Output three-phase
imbalance
Check whether the motor wiring is intact
Disconnect the power and check whether
the terminal characteristics are consistent at
the inverter output side and DC side
17
Overspeed in
the same
direction
(within the
maximum
speed
allowed)
Encoder parameter setting
is incorrect or disturbed
Check encoder circuit
Excessive positive load or
sudden load change
Check the external causes for sudden load
change
18
Overspeed in
the reverse
direction
(within the
maximum
speed
allowed)
Encoder parameter setting
is incorrect or disturbed
Check encoder circuit
Excessive reverse load or
sudden load change
Check the external causes for sudden load
change
21
abc
overcurrent
(three-phase
instantaneous
value)
Motor single phase short
circuit to ground
Check the motor and output line loop
Encoder fault
Check whether the encoder is damaged or
whether the wiring is correct
Drive board detection
circuit error
Replace the drive board
27
Output
overcurrent
(valid value)
Running for too long in an
overload status, the
greater the load, the
shorter the time
Stop running for a period of time, and if it
reappears again after running, check
whether the load is in the allowed range
Motor stalling
Check the motor or brake
Motor coil short circuit
Check the motor
Output short circuit
Check the wiring or motor
29
Abnormal bus
fluctuation
Input side voltage
anomaly
Check the network voltage
Input voltage phase
missing
The input side connecting
terminal is loose
Check the input terminal wiring
Rectifier module damaged
Check whether the rectifier module is
damaged
30
Overspeed
protection
(exceeding
the maximum
speed
protection
limit)
Encoder parameter setting
is incorrect or disturbed
Check encoder circuit
Load sudden change
Check the external causes for sudden load
change
Overspeed protection
parameter setting error
Check the parameter
31
Motor I2T
overcurrent
Low grid voltage
Check the input power supply
Sudden load change
during running
Reduce the sudden load change frequency
and amplitude
The motor parameters are
not set normally
Correctly set the motor parameters
Encoder parameter setting
is incorrect or disturbed
Check encoder circuit
32
Ground
Wiring error
Correct the false wiring according to the
user's manual