TECO A510s - Page 472

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 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 to
activate.
 Sudden drop in load.
 Belt break.
 Check under torque
detection parameters
(08-19 / 08-20).
 Check load / application.
run
Switch for
Motor1/Motor
2
Switch for Motor1/Motor2 in
running time
 Execute command for switching
motor2 in running time
 Execute command for switching
motor in running time
 Revise the sequence
control and switch motor
in top time.
OS
Over speed
Motor speed exceeds level
set in 20-20 (PG Over
speed Level) for the time
set in 20-21 (PG over
speed time). Active when
20-19 (= 0 or 1).
This fault is active V/F + PG
and SV control mode
(00-00 = 1 or 3 or 4). Motor
speed can be monitored by
12-22
 Motor speed overshoot (ASR)
 PG ppr set incorrectly.
 Overspeed parameters set
incorrectly.
 Check ASR parameters
group 21.
 Check PG parameters
 Check overspeed
parameters 20-20/20-12.