DRV-28 inverter
s Troubleshooting
-234-
Fault
code
Fault type
Possible cause
Corrective measures
Data storage error occurred
to the keypad
ETH1
To-ground short
circuit fault 1
Inverter output is short
connected to the ground;
Current detection circuit is
faulty;
Actual motor power setup
deviates sharply from the
inverter power
Check whether motor wiring is
proper;
Replace the hall component;
Replace the main control
board;
Reset the motor parameters
properly
ETH2
To-ground short
circuit fault 1
Inverter output is short
connected to ground;
Current detection circuit is
faulty;
Actual motor power setup
deviates sharply from the
inverter power
Check whether motor wiring is
proper;
Replace the hall component;
Replace the main control
board;
Reset the motor parameters
properly
dEu
Speed deviation
fault
Load is too heavy, or stall
occurred
Check the load to ensure it is
proper, increase the detection
time;
Check whether control
parameters are set properly
STo
Maladjustment fault
Control parameters of
synchronous motor is set
improperly;
The parameter gained from
autotuning is inaccurate;
The inverter is not
connected to motor
Check the load to ensure it is
proper,
Check whether load is proper;
Check whether control
parameters are set correctly;
Increase maladjustment
detection time
LL
Electronic underload
fault
The inverter performs
underload pre-alarm based
on the set value
Check the load and overload
pre-alarm threshold
ENC1O
Encoder offline fault
Encoder line sequence is
wrong, or signal wires are
poorly connected
Check the encoder wiring
ENC1D
Encoder reversal
fault
The encoder speed signal is
contrary to the motor running
direction
Reset encoder direction
ENC1Z
Encoder Z pulse
offline fault
Z signal wires are
disconnected
Check the wiring of Z signal
