TECO E510s Series - Page 322

5-3
LED display Description Cause Possible solutions
OH4
Motor
overheating
 Motor overheating
 The input of PTC
(Positive Temperature
Coefficient ) exceeds the
overheat protection
level.
 The surrounding temperature
of motor is too high.
 The input of PTC (Positive
Temperature Coefficient )
exceeds the overheat protection
level. (08-42)
 Check the surrounding
temperature of motor.
 Check the MT and GND
terminal wiring be correct.
OL1
Motor
overload
Internal motor overload
protection tripped,
active when protection
curve 08-05 = xxx1.
 Voltage setting V/F mode
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 and operation
duty cycle.
OL2
Inverter
overload
Inverter thermal
overload protection
tripped.
If an inverter overload
occurs 4 times in five
minutes, it is required to
wait 4 minutes before
resetting the fault.
 Voltage setting V/F mode too
high, resulting in
over-excitation of the motor.
 Inverter rating too small.
 Load too heavy.
 Check V/f curve.
 Replace inverter with
larger rating.
 Check and reduce motor
load, check and operation
duty cycle.
OT
Over torque
detection
Inverter 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
in 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.