TECHTOP TD350 - Page 248

TD350 Series VFD Troubleshooting
-243-
Fault
code
Fault type
Possible cause
Corrective measures
ETH1
[32] To-ground short
circuit fault 1
VFD output is short
connected to the ground;
Current detection circuit is
faulty;
Actual motor power setting
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
ETH2
[33] To-ground short
circuit fault 1
VFD output is short
connected to ground;
Current detection circuit is
faulty;
Actual motor power setting
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
[34] 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
[35] 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
[36] Electronic
underload fault
The VFD performs
underload pre-alarm based
on the set value
Check the load and overload
pre-alarm threshold
ENC1O
[37] Encoder offline
fault
Encoder line sequence is
wrong, or signal wires are
poorly connected
Check the encoder wiring
ENC1D
[38] Encoder
reversal fault
The encoder speed signal is
contrary to the motor running
direction
Reset encoder direction
ENC1Z
[39] Encoder Z pulse
offline fault
Z signal wires are
disconnected
Check the wiring of Z signal
OT
Motor
over-temperature
Motor over-temperature
input terminal is valid;
Check the wiring of motor
over-temperature input terminal