Filter
Top Products
Electro-magnetic interference (EMI) and leakage currents
PRECAUTIONS FOR USE OF THE INVERTER
61
3
Selecting the rated sensitivity current for the earth leakage circuit
breaker
When using an earth leakage circuit breaker with the inverter circuit, select its rated sensitivity current as follows,
independently of the PWM carrier frequency.
• Inverter/converter unit leakage current
400 V class (input power condition: 440 V/60 Hz, power supply unbalance within 3%)
• Breaker designed for harmonic and surge suppression
Rated sensitivity current
In 10 (Ig1 + Ign + Igi + Ig2 + Igm)
• Standard breaker
Rated sensitivity current
In 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
(When the converter unit is connected, add the
leakage current of converter unit.)
<Example>
• Selection example for the connection of the 400 V class
Item
Breaker designed
for harmonic and
surge suppression
Standard breaker
Leakage current Ig1 (mA)
1
66
5 m
= 0.11
3 1000 m
Leakage current Ign (mA) 0 (without noise filter)
Leakage current Igi (mA)
1 (without EMC filter)
For the leakage current of the inverter, refer to
the following table.
Leakage current Ig2 (mA)
1
66
60 m
= 1.32
3 1000 m
Motor leakage current Igm (mA) 0.36
Total leakage current (mA) 2.79 6.15
Rated sensitivity current (mA) ( Ig 10) 30 100
Inverter/
converter unit
FR-A800
(Standard model)
FR-A802
(Separated converter type)
Converter unit FR-CC2
H315K, H355K H400K to H500K
EMC filter ON OFF - ON OFF ON OFF
3522 352702
211 2121
(mA)
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)
0
20
40
60
80
100
120
leakage currents (mA)
leakage currents (mA)
23.5
5.5
81422
30
38
60
80
100
150
Cable
size (mm
2
)
0. 1
0. 2
0. 3
0. 5
0. 7
1. 0
2. 0
1. 5 3. 7
2. 2
7. 5 1522
11
37
30
55
455.5 18. 5
Noise
filter
Inverter
ELB
Ig1 Ign
Igi
Ig2 Igm
M
5.5mm
2
5m 5.5mm
2
60m
400V
2.2kW
3φ
Phase
earthing
(grounding)
Earthed-neutral
system