8-15
8.6 Protective Functions
Name Description
LED
monitor
displays
Alarm
output
[30A/B/C]
Overcurrent
protection
Stops the inverter output to protect the
inverter from an overcurrent resulting from
overload.
During
acceleration
E
Short-circuit
protection
Stops the inverter output to protect the
inverter from overcurrent due to a
short-circuiting in the output circuit.
During
deceleration
E
Ground fault
protection
Stops the inverter output to protect the
inverter from overcurrent due to a ground
fault in the output circuit. This protection is
effective only during startup of the inverter. If
you turn ON the inverter without removing
the ground fault, this protection may not
work.
During running
at constant
speed
E
Yes
During
acceleration
W
During
deceleration
W
Overvoltage
protection
Stops the inverter output upon detection of
an overvoltage condition (400 VDC for
three-phase 230 V, 800 VDC for three-phase
460 V class series) in the DC link bus.
This protection is not assured if extremely
large AC line voltage is applied inadvertently.
During running
at constant
speed (stopped)
W
Yes
Undervoltage
protection
Stops the inverter output when the DC link bus voltage drops
below the undervoltage level (200 VDC for three-phase 230 V,
400 VDC for three-phase 460 V class series).
However, if data "4 or 5" is selected for F14, no alarm is output
even if the DC link bus voltage drops.
NW
Yes*
1
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 will not detect input phase loss if any.
NKP
Yes
Output phase
loss protection
Detects breaks in inverter output wiring at the start of running
and during running, stopping the inverter output.
RN
Yes
Stops the inverter output upon detecting excess heat sink
temperature in case of cooling fan failure or overload.
J
Yes
Overheat
protection
Discharging and inverter operation are stopped due to
overheating of an external braking resistor.
* Function codes must be set corresponding to the braking
resistor.
FDJ
Yes
*
1
This alarm on [30A/B/C] should be ignored depending upon the function code setting.
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