Omron SYSDRIVE 3G3FV User Manual page 345

Maintenance Operations
Fault Display
SC
Short Circuit
OV
Overvoltage
UV1
DC Bus Undervolt
UV2
CTL PS Undervolt
UV3
MC Answerback
PF
Input Pha Loss
Meaning
The Inverter output or load was
short-circuited.
The main circuit DC voltage
exceeded the overvoltage
detection level.
200-V class: Approx. 400 V
400-V class: Approx. 800 V
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
The control power supply
voltage dropped.
A failure occurred in the inrush
prevention circuit.
The main circuit DC voltage
oscillates unusually (not when
regenerating).
This fault is detected when
L8-05 is set to "Enabled."
Probable causes and remedies
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.
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.
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.
Try turning the power supply off and on.
Replace the Inverter if the fault continues to oc-
cur.
Try turning the power supply off and on.
Replace the Inverter if the fault continues to oc-
cur.
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.)
Chapter 8
8-3