Omron SYSDRIVE 3G3FV, User Manual, Page: 345 / 400

8-3
Fault Display Probable causes and remedies Meaning
SC
Short Circuit
The Inverter output or load was
short-circuited.
•
A short-circuit or ground fault occurred at the In-
verter output. (A short or ground fault can be
caused by motor burn damage, worn insulation, or
a damaged cable.)
→
Reset the fault after correcting its cause.
OV
Overvoltage
The main circuit DC voltage
exceeded the overvoltage
detection level.
200-V class: Approx. 400 V
400-V class: Approx. 800 V
•
The deceleration time is too short and the regen-
erative energy from the motor is too large.
→
Increase the deceleration time or connect a
braking resistor (or Braking Resistor Unit).
•
A surge is generated when the phase-advancer
condenser switches.
→
Add an AC reactor to the power supply input.
•
The power supply voltage is too high.
→
Decrease the voltage so it’s within specifica-
tions.
UV1
DC Bus Undervolt
The main circuit DC voltage is
below the undervoltage
detection level (L2-05).
200-V class: Approx. 190 V
400-V class: Approx. 380 V
•
A phase loss occurred with the input power supply.
•
A momentary power interruption occurred.
•
The wiring terminals for the input power supply are
loose.
•
The voltage fluctuations in the input power supply
are too large.
→
Reset the fault after correcting its cause.
UV2
CTL PS Undervolt
The control power supply
voltage dropped.
→
Try turning the power supply off and on.
→
Replace the Inverter if the fault continues to oc-
cur.
UV3
MC Answerback
A failure occurred in the inrush
prevention circuit.
→
Try turning the power supply off and on.
→
Replace the Inverter if the fault continues to oc-
cur.
PF
Input Pha Loss
The main circuit DC voltage
oscillates unusually (not when
regenerating).
This fault is detected when
L8-05 is set to “Enabled.”
•
A phase loss occurred in the input power supply.
•
A momentary power interruption occurred.
•
The wiring terminals for the input power supply are
loose.
•
The voltage fluctuations in the input power supply
are too large.
•
The voltage balance between phases is bad.
→
Reset the fault after correcting its cause.
•
The main circuit smoothing condenser has ex-
ceeded its life expectancy.
→
Replace the electrolytic condenser.
(Contact your OMRON representative.)
Maintenance Operations
Chapter 8