26.
SELECTION
OF
PERlPMRAt
DEVICE
Sdecting
the
Rated
Senritlvity
Current
for
the
Earn
Lsdclg.
Clrcutl
L3nrk.r
Whn
udng
the
earth
kalrage
circuit breaker
with
the
inverter
circuit,
selec(
its
rated
sensitivity
cunent
as follows:
.
News
Super
NV
series
(Type
SF, CF)
-
Convsntlonal
NV
series
(Type
CA,
CS,
SS)
Rated
sensitivity current:
IAR
>
10
x
(Igl
+
192
+
Ism)
Rated sensitivity current:
IA
n
2
10
x
((91
+
Ign
+
3
x
(Ig2
+
@n))
Ig,,
I&
:
leakage currents
of
cable path during commercial
per
supply
operation
Ign*
:
teakage
cwrent of
noise
filter
on
invetter inpu
side
Igm
:
leakage current
of
motor during commercial
power
supply
opetation
<Example>
For the leakage current value of
the
noise
filter installed on
the
invetter input side,
contact the corresponding filter manufac-
turer. (For Mitsubishi's dedicated filters,
refer
to
page
136,
137.)
Note:
1.
2.
I
The
NV
should
be
installed
to
the
primary (power supply) side
of
the
inverter.
In the
Y
connection neutral point
grounded system,
the
sensitivity
current is purified against ground
faun in the inverter secondary
side. Hence,
the
protective ground
resistance
of
the
load
equipment
should
be
1M
or
less.
Sdection
Exampb
(for the
diagram
shown on the left) (mA)
Leakage
current
Ig,
current
!grn
n
w
/-
W
I
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