Mitsubishi Electric FR-A701 Installation Manuallines page 20

●Selection of rated sensitivity current of earth (ground) leakage current 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.
・Breaker designed for harmonic and surge suppression
Rated sensitivity current In 10 × (Ig
・Standard breaker
Rated sensitivity current In 10 × {Ig
Ig
Ign:
Igm:
Igi:
Example of leakage current of
cable path per 1km during the
commercial power supply operation
when the CV cable is routed in
metal conduit
(200V 60Hz)
120
100
8 0
6 0
4 0
2 0
0
2 3.5 8 1422 38 80 150
5.5 30 60 100
Cable size (mm 2 )
(Example)
Selection example for FR-A700 series and FR-F700 series
2
× 5m
5.5mm
ELB
Noise
filter
Ig1 Ign
Inverter leakage current (with and without EMC filter)
・
Input power conditions
(200V class: 220V/60Hz, 400V class: 440V/60Hz, power supply unbalance within 3%)
Ig Leakage currents in wire path during commercial power supply operation
1, 2:
Leakage current of the inverter input side EMC filter
Leakage current of motor during commercial power supply operation
Leakage current of inverter unit
Leakage current example of
three-phase induction motor
during the commercial
power supply operation
(200V 60Hz)
2. 0
1. 0
0. 7
0. 5
0. 3
0. 2
0. 1
1. 5 3. 7 7. 5 1522 37 55
2. 2 5.5 11 18. 5 30 45
Motor capacity (kW)
2
× 50m
5.5mm
Inverter IM
200V
2.2kW
Ig2 Igm
Igi
Phase
grounding
Earthed-neutral
system
* For the FR-A720-0.4K, 0.75K and FR-F720-0.75K, 1.5K, the EMC filter is always valid. The
leakage current is 1mA.
+ Ign + Igi + Ig
1 2
+ Ign + Igi + 3 × (Ig
1
Example of leakage current per 1km during
the commercial power supply operation
when the CV cable is routed in metal conduit
(Three-phase three-wire delta
connection 400V60Hz)
120
100
8 0
6 0
4 0
2 0
0
2 3.5 8 1422
5.5 30
Cable size (mm
For " " connection, the amount of leakage current is appox.1/3 of the above value.
Leakage current Ig
1
Leakage current Ign
Leakage current Igi
Leakage current Ig
2
Motor leakage current
Igm
Total leakage current
Rated sensitivity current
( Ig×10)
EMC filter
Voltage
(V)
ON (mA)
200 22 (1)*
400 30
400 1
4 - 5
+ Igm)
+ Igm)}
2
Leakage current example of three-
phase induction motorduring the
commercial power supply operation
(Totally-enclosed fan-cooled
type motor 400V60Hz)
2. 0
1. 0
0. 7
0. 5
0. 3
0. 2
0. 1
38 80 150 1. 5 3. 7 7. 5 1522
60 100 2. 2 5.5 11
) Motor capacity (kW)
2
Breaker Designed
for Harmonic and
Surge Suppression
5m
33 ×
1000m
0 (without noise filter)
22 (with EMC filter ON)
50m
33 ×
1000m
0.18
24
500
OFF (mA)
1
1
1
37 55
18. 5 30 45
(mA)
Standard
Breaker
= 0.17
= 1.65
27.66
500