Mitsubishi Electric A800-GF Instruction Manual page 70

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.
• 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 2
5.5 mm 5 m 5.5 mm
ELB
Noise
filter
Inverter
Ig1 Ign Ig2
Igi
• Inverter/converter unit leakage current
400 V class (input power condition: 440 V/60 Hz, power supply unbalance within 3%)
Inverter/
converter unit (Standard model)
EMC filter ON
Phase
35
earthing
(grounding)
Earthed-neutral
2
system
Electro-magnetic interference (EMI) and leakage currents
• Selection example for the
Leakage current Ig1 (mA)
60 m
Leakage current Ign (mA)
φ3
Leakage current Igi (mA)
M 400 V
2.2 kW
Igm
Leakage current Ig2 (mA)
Motor leakage current Igm (mA)
Total leakage current (mA)
Rated sensitivity current (mA) ( Ig  10) 30
FR-A800
(Separated converter type)
OFF
2 2
1 1
PRECAUTIONS FOR USE OF THE INVERTER
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 1km 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 appox.1/3 of the above value.
connection of the 400 V class
Breaker designed
Item for harmonic and
surge suppression
1
3
0 (without noise filter)
1 (without EMC filter)
For the leakage current of the inverter, refer to
the following table.
1
3
0.36
2.79
FR-A802
Converter unit
- ON
70
2
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
66 
= 0.11
1000 m
60 m
66 
= 1.32
1000 m
6.15
100
FR-CC2
OFF
2
1
(mA)
3
69