8-14
8.6 Protective Functions
"—": Not applicable.
Name Description
LED
monitor
displays
Alarm
output
[30A,B,C]
During
acceleration
0c1
During
deceleration
0c2
Overcurrent
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 running
at constant
speed
0c3
Yes
During
acceleration
0u1
During
deceleration
0u2
Overvoltage
protection
The inverter stops the inverter output upon
detecting an overvoltage condition (400 VDC for
three-phase 200 V, single-phase 200 V, and
single -phase 100 V class series; 800 VDC for
three -phase 400 V class series) in the DC link
bus.
This protection is not assured if excess AC line
voltage is applied inadvertently.
During running
at constant
speed
(Stopped)
0u3
Yes
Undervoltage
protection
Stops the inverter output when the DC link bus voltage drops
below the undervoltage level (200 VDC for three-phase 200 V,
single-phase 200 V, and single-phase 100 V class series; 400
VDC for three-phase 400 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.
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 will 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.
0pl
Yes
Inverter - Stops the inverter output upon detecting excess heat sink
temperature in case of cooling fan failure or overload.
0h1
Yes
Overheat
protection
Braking
resistor
- When the built-in or external braking resistor overheats,
discharging and the operation of the inverter are stopped.
* 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 if the Insulated Gate Bipolar Transistor
(IGBT) internal temperature calculated from the output current
and cooling fan temperature detection is over the preset value.
0lu
Yes
(Note) No alarm output depending upon the data setting of the function code.
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