GD350A series high-performance multifunction VFD
-257-
Fault
code
Fault type
Possible cause
Solution
circuit fault 1
to the ground;
Current detection circuit is faulty;
Actual motor power setup
deviates sharply from the VFD
power
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 VFD
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 VFD 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 VFD 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
OT
Motor over-
temperature
fault
Motor over-temperature input
terminal is valid;
Exception occurred to t
temperature detection Exception
Check the wiring of motor over-
temperature input terminal
(terminal function 57);
Check whether temperature