66
VS-616PS5 Installation & Quick Start Manual
Fault Diagnosis and Corrective Actions (continued)
Fault Display
Name
Description
Corrective Action
Class
GF
Ground Fault
Ground fault (GF)
Inverter output grounding current exceeded
50% of inverter rated current.
Check that motor insulation has
not deteriorated.
Check that connection between
inverter and motor is not dam-
aged.
A
OV
Overvoltage
Overvoltage (OV)
The main circuit direct current voltage
exceeded the OV level.
Detection level:
230 V class: Approx. 400 V
460 V class: Approx. 800 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 resistance.
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 transistor,
load side short circuit, ground-
ing, etc.
A
OH
Heatsink Over
temp
Heatsink overheat
(OH1)
The transistor heatsink temperature
exceeded the allowable value.
Check the fan and ambient tem-
perature.
A
OL1
Motor Over-
loaded
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 over-
load level (thermo switch).
Reduce the load, extend the
acceleration time.
A
OL3
Overtorque 1
Overtorque
The torque reference exceeded the detection
level for longer than the specified time.
Verify the parameter setting,
reduce the load at the motor.
A
OL4
Overtorque 2
B
PF
Input Phase
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 Phase
Loss
Output open-phase
Inverter output has open-phase.
Check the output wiring.
Check the motor impedance.
Re-tighten the output terminal
screws.
A
RR
Dyn Brk Transis-
tor
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 overspeed
level. (F1-08)
-
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 excessive load.
A
