9.1 Protective and Diagnostic Functions
9-3
Fault Display Corrective ActionsProbable CausesMeaning
UV3
MC Answerback
Inrush Prevention Circuit Fault
A fault occurred in the inrush preven-
tion circuit.
---
S
Try turning the power supply off
and on.
S
Replace the Inverter if the fault con-
tinues to occur.
PF
Input Pha Loss
Main Circuit Voltage Fault
The main circuit DC voltage oscil-
lates unusually (not when regenerat-
ing).
This fault is detected when L8-05 is
set to “Enabled.”
S
An open-phase occurred in the in-
put power supply.
S A momentary power loss occurred.
S
The wiring terminals for the input
power supply are loose.
S
The voltage fluctuations in the in-
put power supply are too large.
S
The voltage balance between
phases is bad.
Reset the fault after correcting its
cause.
LF
Output Pha Loss
Output Open-phase
An open-phase occurred at the In-
verter output.
This fault is detected when L8-07 is
set to “Enabled.”
S
There is a broken wire in the output
cable.
S
There is a broken wire in the motor-
winding.
S
The output terminals are loose.
Reset the fault after correcting its
cause.
The motor being used has a capacity
less than 5% of the Inverter’s maxi-
mum motor capacity.
Check the motor and Inverter capac-
ity.
Cooling Fin Overheating
The temperature of the Inverter’s
cooling fins exceeded the setting in
The ambient temperature is too high. Install a cooling unit.
OH (OH1)
L8-02 or 105°C.
OH: The temperature exceeded the
setting in L8-02 (Stopping method
There is a heat source nearby. Remove the heat source.
Heatsink Over tmp
can be changed by L8-03.).
OH1: The temperature exceeded
105°C (Stopping method: Coast to
stop).
The Inverter’s cooling fan has
stopped.
Replace the cooling fan. (Contact our
sales re
resentative.
Inverter’s Cooling Fan Stopped
(18.5 kW or larger)
The Inverter’s cooling fan has
stopped. (18.5 kW or larger)
.
RH
Dyn Brk Resistor
Installed Braking Resistor Over-
heating
The braking resistor is overheated
and the protection function set with
L8-01 has operated.
The deceleration time is too short and
the regenerative energy from the mo-
tor is too large.
S Reduce the load, increase the decel-
eration time, or reduce the motor
speed.
S
Change to a Braking Resistor Unit.
RR
Dyn Brk Transistr
Internal Braking Transistor Fault
The braking transistor is not operat-
ing properly.
---
S
Try turning the power supply off
and on.
S
Replace the Inverter if the fault con-
tinues to occur.
Motor Overload
The motor overload protection func-
tion has operated based on the inter-
The load is too heavy. The accelera-
tion time, deceleration time, and cycle
time are too short.
Check the size of the load and the
length of the acceleration, decelera-
tion, and cycle times.
OL1
Motor Overloaded
nal electronic thermal value.
The V/f characteristics voltage is too
high.
Check the V/f characteristics.
The motor ’s rated current setting
(E2-01) is incorrect.
Check the motor’s rated current set-
ting (E2-01).
Inverter Overload
The Inverter overload protection
function has operated based on the
The load is too heavy. The accelera-
tion time, deceleration time and cycle
time are too short.
Check the size of the load and the
length of the acceleration, decelera-
tion, and cycle times.
OL2
Inv Overloaded
internal electronic thermal value.
The V/f characteristics voltage is too
high.
Check the V/f characteristics.
The Inverter capacity is too low.
Replace the Inverter with one that has
a larger capacity.
OL3
Overtorque Det 1
Overtorque 1
There has been a current greater than
the setting in L6-02 for longer than
the setting in L6-03.
---
S
Make sure that the settings in L6-02
and L6-03 are appropriate.
S
Check the mechanical system and
correct the cause of the overtorque.
9
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