8-34
8.8 Details of Protective Functions
The table below lists the name of the protective functions, description, display of LED monitor, whether
alarms output or not at terminals [30A/B/C], and related function codes. If the LED monitor displays an
alarm code, remove the cause of activation of the alarm function by referring to FRENIC-Mini Instruction
Manual, Chapter 6, "TROUBLESHOOTING."
Name Description
LED
monitor
displays
Alarm
output
[30A/B/C]
Related
function
code
During
acceleration
E
During
deceleration
E
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
E
Yes ---
During
acceleration
W
During
deceleration
W
Overvoltage
protection
The inverter stops the inverter output
upon detecting an overvoltage
condition (400 VDC for 3-phase 230 V
and 1-phase 230 V series; 800 VDC for
3-phase 460 V series) in the DC link
circuit.
This protection is not assured if excess
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 3-phase 230 V and 1-phase 230 V series;
400 VDC for 3-phase 460 V 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
(This alarm
may not be
outputted
depending
upon the data
setting of the
function
code.)
F14
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.
NKP
Yes H98
Output phase
loss protection
Detects breaks in inverter output wiring at the start
of running and during running, stopping the inverter
output.
RN
Yes H98
"---": Not applicable.
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