2.4 Protective Functions
2-38
2.4 Protective Functions
The table below lists the name of the protective functions, description, and alarm codes on the LED
monitor. If an alarm code appears on the LED monitor, remove the cause of activation of the alarm
function referring to Chapter 6 "TROUBLESHOOTING."
Table 2.4-1
Name Description
LED
monitor
displays
Alarm output
[30A/B/C]
(Note)
Overcurrent
protection
Stops the inverter output to protect the inverter from an
overcurrent resulting from overload.
During
acceleration
0c1
Short-circuit
protection
Stops the inverter output to protect the inverter from
overcurrent due to a short-circuiting in the output circuit.
During
deceleration
0c2
Stops the inverter output to protect the inverter from
overcurrent due to a ground fault in the output circuit.
(For models of 22 kW in 200 V class series and 22 kW
or below in 400 V class series)
During
running at
constant
speed
0c3
Yes
Ground fault
protection
Detects a zero-phase current in the output current and
stops the inverter output to protect the inverter from
overcurrent due to a ground fault in the output circuit.
(For models of 30 kW in 200 V class series and 30 kW o
above in 400 V class series)
-
ef
Yes
During
acceleration
0u1
During
deceleration
0u2
Overvoltage
protection
Stops the inverter output upon detection of an
overvoltage condition (400 VDC for 200 V class series,
800 VDC for 400 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)
0u3
Yes
Undervoltage
protection
Stops the inverter output when the DC link bus voltage drops below
the undervoltage level (200 VDC for 200 V class series, 400 VDC for
400 V class series).
Note that, if the restart mode after momentary power failure is
selected, no alarm is output even if the DC link bus voltage drops.
lu
Yes*
Input phase loss
protection
Protects the inverter or stops the inverter output when an input
phase loss is detected.
If connected load is light or a DC reactor is connected to the inverter,
this function may not detect input phase loss if any.
lin
Yes*
Output phase
loss protection
Detects breaks in inverter output wiring during running, stopping the
inverter output.
0pl
Yes*
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