Mitsubishi Electric FR-E700EX Instruction Manual page 46

(3) Selection of rated sensitivity current of earth (ground) leakage current breaker
When using the earth leakage current breaker with the drive unit 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 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
80
60
40
20
0
2 3.5 8 14 22 38 80 150
5.5 30 60 100
2
Cable size (mm )
<Example>
2
2
2mm 5m 2mm 10m
Noise
ELB
filter
Drive
unit
Ig1 Ign Ig2
Igi
NOTE
 Install the earth leakage breaker (ELB) on the input side of the drive unit.
 In the connection earthed-neutral system, the sensitivity current is blunt against an earth (ground) fault in the drive
unit output side. Earthing (Grounding) must conform to the requirements of national and local safety regulations and
electrical codes. (NEC section 250, IEC 536 class 1 and other applicable standards)
 When the breaker is installed on the output side of the drive unit, it may be unnecessarily operated by harmonics
even if the effective value is less than the rating.
In this case, do not install the breaker since the eddy current and hysteresis loss will increase, leading to temperature
rise.

General products indicate the following models. ...... BV-C1, BC-V, NVB, NV-L, NV-G2N, NV-G3NA, NV-2F earth leakage
relay (except NV-ZHA), NV with AA neutral wire open-phase protection
The other models are designed for harmonic and surge suppression ...... NV-C/NV-S/MN series, NV30-FA, NV50-FA,
BV-C2, earth leakage alarm breaker (NF-Z), NV-ZHA, NV-H
Ig1, Ig2: Leakage currents in wire path during commercial power
Ign:
Igm:
Igi:
Leakage current Ig1 (mA)
Leakage current Ign (mA)
Leakage current Igi (mA)
φ
3
M
200V0.75kW
Leakage current Ig2 (mA)
Igm
Motor leakage current Igm (mA)
Total leakage current (mA)
Rated sensitivity current (mA)
(Ig  10)
EMC and leakage currents
supply operation
Leakage current of drive unit input side noise filter
Leakage current of motor.
Motor
MM-GKR motor 0.1kW to 0.75kW
0.1kW, 0.2kW
0.4kW
S-PM geared
0.75kW
motor
1.5kW
2.2kW
Leakage current of drive unit
Breaker Designed for
Harmonic and Surge
Suppression
20
20
1.3
15
Leakage current
(mA)
0
0
0.06
0.08
0.13
0.11
Standard Breaker
5m

= 0.1
1000m
0
1
10m

= 0.2
1000m
0
1.7
30
35
3