Mitsubishi Electric FR-E500 Instruction Manual page 57

When the inverter is connected near a large-
capacity power supply transformer (500kVA
or more, wiring length 10m (32.81 feet)
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-NA is connected
to a single-phase 100V class output power
transformer (in excess of 50kVA capacity),
install the power factor improving reactor
(FR-BAL-2.2K) to improve reliability.
( 2 ) 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, independently of the PWM carrier frequency:
Example of leakage current per 1kW in
cable path during commercial power
supply operation when the CV cable is
routed in metal conduit
(200V 60Hz)
120
100
80
60
40
20
0
y Progressive Super series (Type SP, CF, SF, CP)
Rated sensitivity current: I∆n ≥ 10 × (lg1+Ign+lg2+lgm)
y Conventional NV series (Type CA, CS, SS produced prior to '91)
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
2 3.5 8 14 22 38 80 150
5.5 30 60 100
Cable size(mm 2 )
INSTALLATION AND WIRING
NFB
Power
supply
1500
Power
supply 1000
capacity
500
(kVA)
0
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
2.2 5.5
Motor capacity(kW)
44
Inverter
FR-BAL
R X
R (L ) U
1
S
Y
S (L ) V
2
T (L ) W
T Z
3
P(+)P1
FR-BEL
Power
factor
improving
reactor
range
10 Wiring length(m)
7.5 15 22 37 55
11 18.5 30 45