VG5 Installation & Quick-Start Manual 65
OV
Overvoltage
Overvoltage (OV)
The main circuit direct current voltage
exceeded the OV level.
Detection level
230 V class: Approx. 410 V
460 V class: Approx. 820 V
575 V class: Approx. 1040 V
Extend the deceleration time,
add braking circuit.
A
SC
Short Circuit
Load short-circuit (SC) Inverter output (load) is short-circuited.
·Check the motor coil resis-
tance.
·Check the motor installation.
A
PUF
DC Bus Fuse Open
Fuse blown (FU)
·The DC bus fuse is blown.
·The output transistors were damaged.
Check for damaged transis-
tor, load side short circuit,
grounding, etc.
A
OH
Heatsink Over tmp
Heatsink overheat
(OH1)
The transistor heatsink temperature
exceeded the allowable value.
Check the fan and ambient
temperature.
A
OL1
Motor Overloaded
Motor overload (OL1)
Inverter output exceeded the motor
overload level.
Reduce the load. A
OL2
Inv Overloaded
Inverter overload (OL2)
Inverter output exceeded the inverter
overload level.
Reduce the load, extend the
acceleration time.
A
PF
Input Pha Loss
Input open-phase
Inverter input power supply has open
phase.
Large unbalance in input voltage.
·Check the line voltage.
·Re-tighten the input terminal
screws.
A
LF
Output Pha Loss
Output open-phase Inverter output has open-phase.
·Check the output wiring.
·Check the motor imped-
ance.
·Re-tighten the output termi-
nal screws.
A
RR
Dyn Brk Transistr
Braking transistor fail-
ure
The braking transistor has failed. The inverter requires repair. A
RH
Dyn Brk Resistor
Braking resistor unit
overheat
The braking resistor unit temperature
has exceeded the allowable value.
(Protects only inverter built-in type)
Reduce the regenerative
load.
A
OS
Over speed
Overspeed (OS)
The motor speed exceeded the over-
speed level.
-- A
PGO
PG open
PG open circuit (PGO) The PG line is broken.
·Check the PG line.
·Check the condition of the
motor lock or the load.
A
DEV
Speed Deviation
Speed deviation (DEV)
The deviation of the speed reference
and speed feedback exceeded the
regulation level.
Check the load. B
EF
External Fault
Simultaneous forward/
reverse run commands
Both FWD and REV run commands
are simultaneously input for 500ms or
longer.
Check sequence circuit. B
BB
Base Block
External baseblock
External baseblock command is input
from control circuit terminal.
Check sequence circuit. B
Fault Display Name Description Corrective Action Class
Chapter 4 - Diagnostics
Alarm & Fault Displays
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