S1 series standard inverter
-160-
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
LL
Electronic underload
fault
The inverter performs
underload pre-alarm based
on the set value
Check the load and overload
pre-alarm threshold
STO
Safe torque off
Safe torque off function is
enabled by external forces
/
STL1
Exception occurred
to safe circuit of
channel H1
The wiring of STO is
improper;
Fault occurred to external
switch of STO;
Hardware fault occurred to
safety circuit of channel H1
Check whether terminal wiring
of STO is proper and firm
enough;
Check whether external switch
of STO can work properly;
Replace the control board
STL2
Exception occurred
to channel H2 safe
circuit
The wiring of STO is
improper;
Fault occurred to external
switch of STO;
Hardware fault occurred to
safety circuit of channel H2
Check whether terminal wiring
of STO is proper and firm
enough;
Check whether external switch
of STO can work properly;
Replace the control board
STL3
Exception occurred
to channel H1 and
channel H2
Hardware fault occurred to
STO circuit
Replace the control board
CrCE
Safety code FLASH
CRC check fault
Control board is faulty
Replace the control board
