DRV-28 inverter
s Troubleshooting
-235-
Fault
code
Fault type
Possible cause
Corrective measures
OT
Motor
over-temperature
fault
Motor over-temperature
input terminal is valid;
Exception occurred to t
temperature detection
Exception occurred to
resistor;
Long-time overload running
or exception occurred
Check the wiring of motor
over-temperature input terminal
(terminal function 57);
Check whether temperature
sensor is proper;
Check the motor and perform
maintenance on the motor
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
E-Err
Repetitive extension
card type
The two inserted extension
cards are of the same type
Users should not insert two
cards with the same type;
check the type of extension
card, and remove one card
after power down
ENCUV
Encoder UVW loss
fault
No electric level variation
occurred to UVW signal
Check the wiring of UVW;
Encoder is damaged
F1-Er
Failed to identify the
extension card in
card slot 1
There is data transmission in
interfaces of card slot 1,
however, it cannot read the
card type
Confirm whether the extension
card inserted can be
supported;
Stabilize the extension card
interfaces after power down,
