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4.1.2 Peripheral device list
High Power Factor
Voltage
Converter Type
FR-HC-7.5K
FR-HC-15K
200V class
FR-HC-30K
FR-HC-55K
FR-HC-H7.5K
FR-HC-H15K
400V class
FR-HC-H30K
FR-HC-H55K
Note: 1.Select the NFB according to the capacity of the high power factor converter and install one NFB
per high power factor converter.
2.For installations in the United States or Canada, the circuit breaker must be inverse time or
instantaneous trip type.
3.When the breaker on the primary side of the high power factor converter tripped, check for wiring
fault (e.g.short circuit), damage to internal parts of the inverter (high power factor converter), etc.
Identify the cause of the breaker trip, then power on the breaker after removing the cause of the trip.
4.1.3 Selecting the rated sensitivity current for the earth leakage circuit breaker
When using the earth leakage circuit breaker with the inverter circuit, select its rated sensitivity current as follows:
• Breaker for harmonic and surge
Rated sensitivity current: I n 10×(lg1+lg2+lg3+lgm)
• Standard breaker
Rated sensitivity current:
∆
>
I n 10×{lg1+lgn+lg2+3×(lg3+lgm)}
where, lg1, lg2, lg3:leakage currents of cable path
during commercial power supply operation
lgn* :leakage current of noise filter on converter
input side
lgm : leakage current of motor during commercial
power supply operation
5.5mm
×5m
5.5mm
2
<Example>
NV
Noise
filter
High
power
factor
converter
lg1
lgn
Note: 1.Install the NV on the primary (power supply) side
of the power return common converter.
2.Ground fault on the output side of the inverter can
be detected at the running frequency of 120Hz or
lower.
3.In the connection neutral point grounded system,
the sensitivity current becomes worse for ground
faults in the inverter secondary side. Hence, the
protective grounding of the load equipment should
be class C grounding (10 Ω or less).
4.When the breaker is installed in the secondary
side of the inverter, it may be unnecessarily
operated by harmonics if the effective value is
less than the rating. In this case, do not install the
breaker since the eddy current and hysteresis
loss increase and the temperature rises.
5.The following models are standard breakers Type BV-
C1, BC-V, NVB, NV-L, NV-G2N, NV-G3NA, NV-2F
type leakage current relay (except for NV-ZHA), NV
with AA neutral wire open-phase protection
The following models are for harmonic surge
NV-C/NV-S/MN series, NV30-FA, NV50-FA, BV-C2, leakage current alarm breaker (NF-Z), NV-ZHA, NV-H
* Note the leakage current value of the noise filter installed on the high power factor converter input side.
(For Mitsubishi's dedicated filters, see page 71.)
No-fuse breaker (NFB note 1)
or leakage breaker (NV) (note 2)
50AF 50A
100AF 75A
225AF 125A
225AF 225A
30AF 30A
50AF 50A
100AF 75A
225AF 125A
∆
>
×50m
5.5mm
×70m
2
2
3φ
Inverter
IM
200V 2.2kW
lgm
lg2
lg3
Magnetic
Contactor (MC)
S-N35
S-N65
S-N125
S-N220
S-N20
S-N25
S-N65
S-N125
Example of leakage current per
1km in cable path during com-
mercial power supply operation
when the CV cable is routed in
metal conduit (200V 60Hz)
120
100
80
60
40
(mA)
20
0
2 3.5
8 14 22 38 80 150
5.5
Cable size (mm
Selection Example
(for the diagram shown on the left) (mA)
Leakage current lg1
(mA)
Leakage current lgn
(mA)
Leakage current lg2
(mA)
Leakage current lg3
(mA)
Motor leakage
current lgm (mA)
Total leakage current
(mA)
Rated sensitivity cur-
> =
rent ( lg×10) (mA)
- 55 -
Leakage Current Example of
3-Phase Induction Motor dur-
ing Commercial Power Sup-
ply Operation (200V 60Hz)
2.0
1.0
0.7
0.5
0.3
0.2
(mA)
0.1
1.5
3.7
7.5 15 22 37 55
30 60 100
2.2
5.5
11 18.5 30 45
2
)
Motor capacity (kW)
Breaker for
Standard
harmonic and surge
Breaker
5m
33×
------------------
=0.17
1000m
0 (without noise filter)
50m
33×
------------------
=1.65
1000m
70m
33×
------------------
=2.31
1000m
0.18
4.31
30
7.97
100
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