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rminal connection
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e
rminal specs.
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Parameter unit
FR Configurator
69
Selection of rated sensitivity current of earth leakage circuit breaker
When using the earth leakage current breaker with the
inverter circuit, select its rated sensitivity current as follows,
independently of the PWM carrier frequency:
Example
(Note) 1. Install the earth leakage circuit breaker (ELB) on the
input side of the inverter.
2. In the
connection earthed-neutral system, the
sensitivity current is blunt against an earth
(ground) fault in the inverter output side.
Earthing (Grounding) must conform to the
requirements of national and local safety
regulations and electrical codes. (NEC section
250, IEC 536 class 1 and other applicable
standards)
Selection example (in the case of the left figure (400V
class
connection))
Breaker designed for harmonic and surge suppression
Rated sensitivity current:
I
n
10
(Ig1 + Ign + Igi + Ig2 + Igm)
Standard breaker
Rated sensitivity current:
I
n
10
{Ig1 + Ign + Igi + 3
Ig2 + Igm)}
Ig1, Ig2 : Leakage currents in wire path during commercial power supply
operation
Ign
: Leakage current of inverter input side noise filter
Igm
: Leakage current of motor during commercial power supply
operation
Igi
: Leakage current of inverter unit
(200V 60Hz)
(200V 60Hz)
0
2 0
4 0
6 0
8 0
100
120
2 3.5
5.5
8 1422
30
38
60
80
100
150
Motor capacity (kW)
Example of leakage current of
cable path per 1km during the
commercial power supply operation
when the CV cable is routed in
metal conduit
Leakage current example of
three-phase induction motor
during the commercial
power supply operation
Leakage currents (mA)
Leakage currents (mA)
Cable size (mm
2
)
0.1 0.2
0.4
0.75
1.5
2.2
3.7
5.5 11
7.5
20
15
0.02
0.03
0.05
0.07
0.1
0.2
0.3
0.5
0.7
1.0
0
2 0
4 0
6 0
8 0
100
120
2 3.5
5.5
8 1422
30
38
60
80
100
150
0. 1
0. 2
0. 3
0. 5
0. 7
1. 0
2. 0
1.5
3.7
2.2
7.5
15
11
20
5.5
Motor capacity (kW)
For " " connection, the amount of leakage current is appox.1/3 of the above value.
(Three-phase three-wire delta
connection 400V60Hz)
Example of leakage current per 1km during
the commercial power supply operation
when the CV cable is routed in metal conduit
Leakage current example of
three-phase induction motor during the
commercial power supply operation
(Totally-enclosed fan-cooled
type motor 400V60Hz)
leakage currents (mA)
leakage currents (mA)
Cable size (mm
2
)
Noise
filter
Inverter
ELB
Ig1
Ign
Igi
Ig2
Igm
M
5.5mm
2
5m
5.5mm
2
60m
400V
2.2kW
3
φ
Breaker Designed for
Harmonic and Surge
Suppression
Standard Breaker
Leakage current Ig1
(mA)
1
66
5m
= 0.11
3
1000m
Leakage current Ign
(mA)
0 (Without a noise filter or Filterpack)
Leakage current Igi
(mA)
1
Leakage current Ig2
(mA)
1
66
60m
= 1.32
3
1000m
Motor leakage
current Igm (mA)
0.36
Total leakage
current (mA)
2.79
6.15
Rated sensitivity
current (mA)
(
Ig
10)
30
100
Содержание F720PJ-11KF
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