Mitsubishi Electric FR-CC2-P Instruction Manual page 62

Selecting the rated sensitivity current for the earth leakage circuit
breaker
When using the earth leakage circuit breaker with the inverter or the converter unit circuit, select its rated sensitivity current as
follows.
• 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)}
<Example>
2
5.5 mm 5 m 5.5 mm
ELB
Noise
filter
Inverter
Ig1 Ign
Igi
• Leakage currents of the inverter and the converter unit with a 6-phase transformer
400 V class (input power condition: 440 V/60 Hz, power supply unbalance within 3%)
Inverter/
converter unit (Separated converter type)
EMC filter
Phase
2
earthing
(grounding)
Earthed-neutral
system
1
• Leakage currents of the converter unit with a 12-phase transformer
Electro-magnetic interference (EMI) and leakage currents
• Selection example for the
Leakage current Ig1 (mA)
Leakage current Ign (mA)
2
60 m
Leakage current Igi (mA)
φ3
M
400 V
Leakage current Ig2 (mA)
2.2 kW
Ig2 Igm
Motor leakage current Igm (mA)
Total leakage current (mA)
Rated sensitivity current (mA)
( Ig  10)
FR-A802-P
-
70
2
PRECAUTIONS FOR USE OF THE CONVERTER UNIT
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 of leakage current per 1 km during
the commercial power supply operation
when the CV cable is routed in metal conduit
(Three-phase three-wire delta
connection 400 V 60 Hz)
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 )
For " " connection, the amount of leakage current is approx.1/3 of the above value.
connection of the 400 V class
Breaker designed
Item for harmonic and
surge suppression
1
66 
3
0 (without noise filter)
1 (without EMC filter)
For the leakage current of the inverter, refer to the
following table.
1
66 
3
0.36
2.79
30
Converter unit
FR-CC2-P
ON OFF
2
1
(mA)
Leakage current example of three-
phase induction motor during the
commercial power supply operation
(Totally-enclosed fan-cooled
type motor 400 V 60 Hz)
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)
Standard breaker
5 m
= 0.11
1000 m
60 m
= 1.32
1000 m
6.15
100
61
3