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26. SELECTION OF PERlPMRAt
DEVICE
Sdecting
the Rated
Senritlvity
Current for the Earn Lsdclg. Clrcutl L3nrk.r
W h n
udng
the
earth k a l r a g e 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: I A
n
2 10 x ((91
+
Ign
+
3 x (Ig2
+
@n))
Ig,,
I&
: leakage currents of cable path during commercial p
e
r supply operation
I g n *
: teakage cwrent of
noise
filter
on
invetter i n p u 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
l o a d
equipment
should
be 1 M
or
less.
Sdection E x a m p b
(for the diagram shown on the left) (mA)
Leakage
current
Ig,
current !grn
n
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