8-10
8.5 Protection Features
Name Description
LED
monitor
displays
*1
Alarm
output
[30A/B/C]
Overcurrent
protection
The inverter is stopped for protection against overcurrent
caused by an overload.
During
acceleration
0c1
Yes
Short circuit
protection
The inverter is stopped for protection against overcurrent
caused by a short circuit in the output circuit.
During
deceleration
0c2
Grounding
fault
protection
The inverter is stopped for protection against overcurrent
caused by a grounding fault in the output circuit. If the power
supply is turned on with the grounding fault, the protection
may be invalidated.
During running at
constant speed
0c3
Overvoltage
protection
An excessive voltage (400 VDC for the 200 V class series,
800 VDC for the 400 V class series) in the DC link circuit is
detected and the inverter is stopped. If a remarkably large
voltage is applied by mistake, the protection cannot be made.
During
acceleration
0u1
Yes
During
deceleration
0u2
During running at
constant speed
(Stopped)
0u3
Undervoltage
protection
Stops the inverter output when the DC link bus voltage drops below the
undervoltage level (200 VDC for the 200 V class series, 400 VDC for the 400 V
class series).
When the inverter is driven by a battery power, however, it disables an
undervoltage alarm detection and is to output no alarm signal.
lu
Yes *2
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.
lin
Yes *2
Overheating
protection
The temperature of the heat sink in the event of cooling fan trouble and overload
is detected to stop the inverter.
0h1
Yes
The temperature inside the inverter unit in the event of cooling fan trouble and
overload is detected to stop the inverter.
0h3
Yes
External alarm
input
With the digital input signal TH R, the inverter is stopped as for an alarm.
0h2
Yes
Abnormal
condition in
charger circuit
Upon detection of an abnormal condition in the charger circuit inside the inverter,
this function stops the inverter output. (Applicable to 37 kW or above (3-phase
400 V))
pbf
Yes
Overload
protection
The temperature inside the IGBT is calculated from the detection of output
current and internal temperature, to shut off the inverter output.
0lu
Yes
*1 When the inverter is equipped with the multi-function keypad, it displays the alarm letters on the LED indicator of the
keypad.
*2 This alarm [30A/B/C] may not be output depending upon the data setting of the function code.
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