4-3
Data
display
Cause and actionDescription
%U Main circuit overvoltage
(OV)
The DC voltage of the main
circuit exceeded the
overvoltage detection level
(approx. 400 V for 200-V class
models and approx. 800 V for
400-V class models).
The deceleration time setting is too short and regenerative
energy from the motor is excessive.
→ Increase the deceleration time or connect the Braking Resistor
Unit.
A surge is imposed when the phase advance capacitor is
switched.
→ Insert an AC reactor into the power input side of the Inverter.
The voltage of power supply to the Inverter is too high.
→ Lower the voltage within the rated power supply voltage.
uU1 Main circuit undervoltage
(UV1)
The DC voltage of the main
circuit dropped to or below the
undervoltage detection level
(approx. 190 V for 200-V class
models and approx. 380 V for
400-V class models).
Power supply to the Inverter has phase loss.
An instantaneous power interruption occurred.
Power input terminal screws are loose.
The voltage fluctuation of power supply to the Inverter is
excessive.
→ Determine the cause of the error, take the necessary action,
and reset the system.
uU2 Control power supply fault
(UV2)
A voltage fault occurred in
control output power supply.
→ Turn power supply to the Inverter OFF and ON.
→ If this problem persists, replace the Inverter.
uU3 Inrush current preventive
circuit fault (UV3)
The inrush current preventive
circuit is malfunctioning.
→ Turn power supply to the Inverter OFF and ON.
→ If this problem persists, replace the Inverter.
Short-phase input (SPI)
The DC voltage of the main
circuit fluctuates excessively
while the Inverter is not
affected by regenerative
energy. (The input phase loss
detection level and time are
set with n080 and n081.)
Power supply to the Inverter has phase loss.
An instantaneous power interruption occurred.
Power input terminal screws are loose.
The voltage fluctuation of power supply to the Inverter is
excessive.
The voltages of the phases of power supply to the Inverter are
uneven.
→ Determine the cause of the error, take the necessary action,
and reset the system.
sp% Short-phase output (SPO)
The Inverter output has phase
loss. (The output phase loss
detection level and time are
set with n082 and n083.)
The output cable is broken.
A motor coil is broken.
Motor output terminal screws are loose.
→ Determine the cause of the error, take the necessary action,
and reset the system.
%h1* Heat sink overheat (OH1)
The temperature of the heat
sink exceeded approx. 90°C.
The ambient temperature is too high.
→ Install a cooling fan or air conditioner.
A heat generating object exists near the Inverter.
→ Remove the object.
%h2 Heat sink overheat (OH2)
The temperature of the heat
sink exceeded approx. 100°C.
The cooling fan of the Inverter is not operating.
→ The cooling fan must be replaced, in which case contact your
OMRON representative.
High carrier frequency. (400V-class models)
→ Decrease the set value of n050.
Operation Chapter 4
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