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8.3 Protective Functions
"—": Not applicable.
Name
Description
LED
monitor
displays
Alarm
output
[30A,B,C]
Overcurrent
protection
Short-circuit
protection
Ground fault
protection
- Stops the inverter output to protect the
inverter from an overcurrent resulting from
overload.
- Stops the inverter output to protect the
inverter from an overcurrent due to a short
circuit in the output circuit.
- Stops the inverter output to protect the
inverter from an overcurrent due to a ground
fault in the output circuit. This protection is
effective only when the inverter starts. If you
turn on the inverter without removing the
ground fault, this protection may not work.
During
acceleration
During
deceleration
During running
at constant
speed
OC1
OC2
OC3
Yes
Overvoltage
protection
Stops the inverter output upon detection of
overvoltage (400 VDC for 200 V series and 800
VDC for 400 V series) in the DC link bus.
This protection is not assured if excess AC line
voltage is applied inadvertently.
During
acceleration
During
deceleration
During running
at constant
speed
(Stopped)
OU1
OU2
OU3
Yes
Under voltage
protection
Stops the inverter output when the DC link bus voltage
drops below the under voltage level (200 VDC for 200 V series
and 400VDC for 400 V series).
However, when F14 = 4 or 5, no alarm is output even if the DC link
bus voltage drops.
LU
Yes
(Note)
Input phase loss
protection
Detects input phase loss, stopping the inverter output.
This function prevents the inverter from undergoing heavy
stress that may be caused by input phase loss or inter-phase
voltage unbalance and may damage the inverter.
If connected load is light or a DC reactor is connected to the
inverter, this function may not detect input phase loss if any.
In single-phase series of inverters, this function is disabled by
factory default.
Lin
Yes
Output phase
loss protection
Detects breaks in inverter output wiring at the start of running and
during running, stopping the inverter output.
OPL
Yes
O
v
er
h
ea
t
p
ro
tec
ti
o
n
Inverter
- Stops the inverter output upon detecting excess heat sink
temperature in case of cooling fan failure or overload.
OH1
Yes
Braking
resistor
- Protects the braking resistor from overheat in accordance with
the setting of the electronic thermal overload relay for braking
resistor.
* It is necessary to set the function code data according to the
braking resistor used (built-in or external).
dbH
Yes
Overload
protection
Stops the inverter output according to the inverter heat sink
temperature and the switching element temperature
calculated from the output current.
OLU
Yes
(Note) No alarm output depending upon the data setting of the function code.
8-5