Mitsubishi FR-A800

Power supply harmonics
PRECAUTIONS FOR USE OF THE INVERTER
89
3
• Equivalent Capacity Limits
• Harmonic content (Values of the fundamental current is 100%)
• Calculation of equivalent capacity P0 of harmonic generating equipment
"Equivalent capacity" is the capacity of a 6-pulse converter converted from the capacity of consumer's harmonic generating
equipment and is calculated by the following equation: If the sum of equivalent capacities is higher than the limit in Table 3,
harmonics must be calculated with the following procedure:
• Calculation of outgoing harmonic current
Outgoing harmonic current = fundamental wave current (value converted from received power voltage)
 operation ratio 
harmonic content
• Operation ratio: Operation ratio = actual load factor  operation time ratio during 30 minutes
• Harmonic content: Found in Table 4.
• Rated capacities and outgoing harmonic currents of inverter-driven motors
Received power voltage Reference capacity
6.6 kV 50 kVA
22/33 kV 300 kVA
66 kV or more 2000 kVA
Reactor 5th 7th 11th 13th 17th 19th 23rd 25th
Not used 65 41 8.5 7.7 4.3 3.1 2.6 1.8
Used (AC side) 38 14.5 7.4 3.4 3.2 1.9 1.7 1.3
Used (DC side) 30 13 8.4 5.0 4.7 3.2 3.0 2.2
Used (AC, DC sides) 28 9.1 7.2 4.1 3.2 2.4 1.6 1.4
P0 =  (Ki  Pi) [kVA]
 Rated capacity: Determined by the capacity of the applied
motor and found in Table 5. The rated capacity used here
is used to calculate the generated harmonic amount and
is different from the power supply capacity required for
actual inverter drive.
Ki: Conversion coefficient (Refer to Table 2)
Pi: Rated capacity of harmonic generating equipment
[kVA]
i: Number indicating the conversion circuit type
Applicable
motor
(kW)
Rated
current (A)
Fundamental
wave current
converted
from 6.6 kV
(mA)
Rated
capacity
(kVA)
Outgoing harmonic current converted from 6.6 kV (mA)
(No reactor, 100% operation ratio)
200 V 400 V 5th 7th 11th 13th 17th 19th 23rd 25th
0.4 1.61 0.81 49 0.57 31.85 20.09 4.165 3.773 2.107 1.519 1.274 0.882
0.75 2.74 1.37 83 0.97 53.95 34.03 7.055 6.391 3.569 2.573 2.158 1.494
1.5 5.50 2.75 167 1.95 108.6 68.47 14.20 12.86 7.181 5.177 4.342 3.006
2.2 7.93 3.96 240 2.81 156.0 98.40 20.40 18.48 10.32 7.440 6.240 4.320
3.7 13.0 6.50 394 4.61 257.1 161.5 33.49 30.34 16.94 12.21 10.24 7.092
5.5 19.1 9.55 579 6.77 376.1 237.4 49.22 44.58 24.90 17.95 15.05 10.42
7.5 25.6 12.8 776 9.07 504.4 318.2 65.96 59.75 33.37 24.06 20.18 13.97
11 36.9 18.5 1121 13.1 728.7 459.6 95.29 86.32 48.20 34.75 29.15 20.18
15 49.8 24.9 1509 17.6 980.9 618.7 128.3 116.2 64.89 46.78 39.24 27.16
18.5 61.4 30.7 1860 21.8 1209 762.6 158.1 143.2 79.98 57.66 48.36 33.48
22 73.1 36.6 2220 25.9 1443 910.2 188.7 170.9 95.46 68.82 57.72 39.96
30 98.0 49.0 2970 34.7 1931 1218 252.5 228.7 127.7 92.07 77.22 53.46
37 121 60.4 3660 42.8 2379 1501 311.1 281.8 157.4 113.5 95.16 65.88
45 147 73.5 4450 52.1 2893 1825 378.3 342.7 191.4 138.0 115.7 80.10
55 180 89.9 5450 63.7 3543 2235 463.3 419.7 234.4 169.0 141.7 98.10