TECO F510 series - OV Over voltage; UV Under voltage; OH1 Heat sink overheating; OH4 Motor overheating

10-2
LED display Description Cause Possible solutions
OV
Over voltage
DC bus voltage exceeds the
OV detection level:
410Vdc: 200V class
820Vdc: 400V class
(For 400V class, if input
voltage 01-14 is set lower
than 400V, the OV detection
value will is decreased to
730Vdc).
 Deceleration time set too short,
resulting in regenerative energy
flowing back from motor to the
inverter.
 The inverter input voltage is too high.
 Use of power factor correction
capacitors.
 Excessive braking load.
 Braking transistor or resistor
defective.
 Speed search parameters set
incorrectly.
 Increase deceleration time
 Reduce input voltage to
comply with the input voltage
requirements or install an AC
line reactor to lower the input
voltage.
 Remove the power factor
correction capacitor.
 Use dynamic braking unit.
 Replace braking transistor or
resistor.
 Adjust speed search
parameters.
UV
Under voltage
DC bus voltage is lower
than the UV detection level
or the pre-charge contactor
is not active while the
inverter is running.
190Vdc: 200V class;
380Vdc: 400V class
(The detection value can be
adjusted by 07-13).
 The input voltage is too low.
 Input phase loss.
 Input voltage fluctuation.
 Pre-charge contactor damaged.
 DC bus voltage feedback signal
value not incorrect.
 Check the input voltage.
 Check input wiring.
 Check power source
 Replace pre-charge contactor
 Replace control board or
complete inverter.
IPL
input phase
loss
Phase loss at the input side
of the inverter or input
voltage imbalance, active
when 08-09 = 1 (enabled).
 IPL occurs.
 Terminal screws of R/L1, S/L2 or
T/L3 are loose or lost.
 Input voltage fluctuation is too big.
 Input Voltage is imbalance per phase
 Aging of the capacity on main circuit
inside inverter
 Check if the main wiring
connection is correct.

Check if the terminal screw
gets loose.

Make sure having stable input
voltage or turn off IPL
detection function.

Replace the circuit board or
inverter
OPL
output phase
loss
Phase loss at the output
side of the inverter, active
when 08-10 = 1 (enabled).
 Wiring loose in inverter output
terminal.
 Motor rated current is less than 10%
of the inverter rated current.
 Check output wiring / faster
screws.
 Check motor & inverter rating.
OH1
Heatsink
overheat
The temperature of the heat
sink is too high.
Note: when OH1 fault
occurs three times within
five minutes, it is required to
wait 10 minutes before
resetting the fault.
 Ambient temperature too high.
 cooling fan failed
 Carrier frequency set too high.
 Load too heavy.
 Install fan or AC to cool
surroundings.
 Replace cooling fan.
 Reduce carrier frequency.
 Reduce load / Measure
output current
OH4
Motor
overheatin
g
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.
 Check the surrounding
temperature of motor.
 Check 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 heav
y
.
 Check V/f curve.
 Check motor rated current
 Check and reduce motor
load, check and operation
duty cycle.