
7-3
LED Display
Description
Cause
Possible Solutions
OL1 Motor
Overload
Internal motor overload
protection tripped, active
when protection curve
08-05 = xxx1.
● Voltage setting in V/F mode set
too high, resulting in over-
excitation of the motor.
● Motor rated current (02-01) set
incorrectly.
● Load too heavy.
● Check V/f curve.
● Check motor rated current
● Check and reduce motor
load, check application
operation duty cycle.
OL2 AC Drive
Overload
AC Drive thermal overload
protection tripped. If an
AC Drive overload occurs 4
times in five minutes, user
must wait 4 minutes before
the AC Drive can be reset.
● Voltage setting in V/F mode set
too high, resulting in over-
excitation of the motor.
● AC Drive rating to small.
● Load too heavy.
● Check V/f curve.
● Replace AC Drive with
larger size AC Drive.
● Check and reduce motor
load, check application
operation duty cycle.
OT Over Torque
Detection
AC Drive output torque is
higher than 08-15 (over
torque detection level) for the
time specified in 08-16.
Parameter 08-14 = 0 to
activate.
● Load too heavy.
● Check over torque
detection parameters
(08-15 / 08-16).
● Check and reduce motor
load, check and operation
duty cycle.
Comm. Error
No Modbus communication
received for the time specified
in 09-06 (communication
error detection time).
Active when 09-07 = 0 to 2
● Connection lost or wire broken.
● Host stopped communicating.
● Check connection.
● Check host computer/
software.
PID Feedback
Loss
PID feedback signal falls
below level specified in 10-12
(PID feedback loss detection
level) for the time specified in
10-13 (Feedback loss
detection time). Active when
parameter 10-11 = 2.
● Feedback signal wire broken
● Feedback sensor broken.
● Check feedback wiring.
● Replace feedback sensor.
Safety 1 Error
STO terminal 1 error
● Terminal board Input SF1 and
SG are not connected
● Check SF1 and SG
Connection.
Safety 2 Error
STO terminal 2 error
● Terminal board Input SF2 and
SG are not connected
● Check SF2 and SG
Connection.
Safety 3 Error
STO terminal 3 error
● Transformer voltage output of
AC Drive is not stable.
● Replace the power board
● Contact support
External
Fault 0
External fault (Modbus)
● Modbus communication
0x2501 bit 2 = "1"
● Reset Modbus
communication
0x2501 bit 2 = "1"