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Mitsubishi Electric FR-E520 Instruction Manual Page 61

Transistorized inverter.
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When the inverter is connected near a large-
capacity power supply transformer (500kVA or more,
wiring length 10m maximum) or there is power
capacitor switch-over, excessive peak currents may
flow into the power input circuit and damage the
converter circuit. In such a case, the power supply
improving reactor (FR-BEL or FR-BAL) must be
installed.
When the FR-E510W-0.4K is connected to a single-
phase 100V class output power transformer (in
excess of 50kVA capacity), install the power factor
improving
reactor
reliability
(2) Selecting the rated sensitivity current for the earth (ground) leakage
circuit breaker
When using the earth (ground) leakage circuit breaker with the inverter circuit, select its
rated sensitivity current as follows, independently of the PWM carrier frequency:
xample of leakage current per 1km in
able path during commercial power
upply operation when the CV cable is
outed in metal conduit
200V 60Hz)
120
100
80
60
40
20
0
2
Cable size (mm
• Breaker for harmonic and surge
Rated sensitivity current: I∆n ≥ 10×(lg1+Ign+lg2+lgm)
• Standard breaker
Rated sensitivity current: I∆n ≥ 10×{lg1+lgn+3×(lg2+lgm)}
lg1, lg2 : Leakage currents of cable path during commercial power supply operation
lgn*
: Leakage current of noise filter on inverter input side
lgm
: Leakage current of motor during commercial power supply operation
(FR-BAL-2.2K)
to
3.5
8
14
22
38
80
150
5.5
30
60
100
2
)
INSTALLATION AND WIRING
NFB
Power
supply
1500
Power
supply
1000
capacity
improve
500
(kVA)
Leakage current example of 3-phase
induction motor during commercial
power supply operation (200V 60Hz)
2.0
1.0
0.7
0.5
0.3
0.2
0.1
1.5
3.7
7.5
2.2
5.5
Motor capacity (kW)
51
Inverter
FR-BAL
R
X
U
R (L
)
1
S
Y
V
S (L
)
2
W
T
Z
T (L
)
3
P1
P
(+)
FR-BEL
Power
factor
improving
reactor
range
0
10
Wiring length(m)
15 22
37
55
11
18.5
30 45
2

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