TECO F510 series - OL2 Inverter overload; OT Over torque detection; UT Under torque detection

10-3
LED display Description Cause
Possible solutions
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 or 2
to activate.
 Load too heavy.
 Check over torque detection
parameters (08-15 / 08-16).
 Check and reduce motor
load, check and operation
duty cycle.
UT
Under torque
detection
Inverter output torque is
lower than 08-19 (under
torque detection level) for
the time specified in 08-20.
Parameter 08-18 = 0 or 2
to activate.
 Sudden drop in load.
 Belt break.
 Check under torque detection
parameters (08-19 / 08-20).
 Check load / application.
CE
communication
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.
FB
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.
STO
Safety switch
Inverter safety switches
open.
 Terminal board Input F1 and F2 are
not connected (For standard H & C
type)
 Terminal board Input SF1 / SF2 and
SG are not connected (For
enhanced E & G type)
 08-30 set to 1,free run to stop, and
digital terminal is open, when
03-00~03-07=58
 Check F1 and F2 connection.
(For standard H & C type)
 Check SF1 / SF2 and SG
connection (For enhanced E
& G type)
 Check if 08-30 =0 and
03-00~03-07=58
STO2
Safety switch
SS1
Safety switch
Inverter safety switches
open.
 When 08-30 is set to 0:
Deceleration to stop,
and digital
terminal switch(58) is turned on.
 Check digital terminal(58) is
turned on.
EF0
External fault 0
External fault (Modbus)
Modbus communication 0x2501 bit 2=
"1"
 Reset Modbus
communication 0x2501 bit
2= "1"