Mitsubishi Electric FR-A720-0.4K Instruction Manual page 70

Noise and leakage currents
1) Calculation of equivalent capacity P0 of harmonic generating equipment
The "equivalent capacity" is the capacity of a 6-pulse converter converted from the capacity of consumer's harmonic
generating equipment and is calculated with 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:
P0 = Σ (Ki × Pi) [kVA]
Ki: Conversion factor(According to Table 2)
Pi: Rated capacity of harmonic generating equipment
i : Number indicating the conversion circuit type
2) 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.
Table 5 Rated capacities and outgoing harmonic currents of inverter-driven motors
Rated Current
Applied (A)
Motor
(kW)
200V 400V
0.4 1.61 0.81
0.75 2.74 1.37
1.5 5.5 2.75
2.2 7.93 3.96
3.7 13.0 6.50
5.5 19.1 9.55
7.5 25.6 12.8
11 36.9 18.5
15 49.8 24.9
18.5 61.4 30.7
22 73.1 36.6
30 98.0 49.0
37 121 60.4
45 147 73.5
55 180 89.9
Rated Current
Applied (A)
Motor
(kW)
200V 400V
75 245 123
90 293 147
110 357 179
132 — 216
160 — 258
220 — 355
250 — 403
280 — 450
315 — 506
355 — 571
400 — 643
450 — 723
500 — 804
60
[kVA]
*
Fundamental
Wave Current Rated
Converted Capacity
from 6.6kV (kVA)
(mA)
49 0.57
83 0.97
167 1.95
240 2.81
394 4.61
579 6.77
776 9.07
1121 13.1
1509 17.6
1860 21.8
2220 25.9
2970 34.7
3660 42.8
4450 52.1
5450 63.7
Fundamental
Wave Current Rated
Converted Capacity
from 6.6kV (kVA)
(mA)
7455 87.2
8909 104
10848 127
13091 153
15636 183
21515 252
24424 286
27273 319
30667 359
34606 405
38970 456
43818 512
48727 570
* Rated capacity: Determined by the capacity of the applied motor and
found in Table 5. It should be noted that the rated capacity used here
is used to calculate generated harmonic amount and is different from
the power supply capacity required for actual inverter drive.
Outgoing Harmonic Current Converted from 6.6kV (mA)
(No reactor, 100% operation ratio)
5th 7th 11th
31.85 20.09 4.165
53.95 34.03 7.055
108.6 68.47 14.20
156.0 98.40 20.40
257.1 161.5 33.49
376.1 237.4 49.22
504.4 318.2 65.96
728.7 459.6 95.29
980.9 618.7 128.3
1209 762.6 158.1
1443 910.2 188.7
1931 1218 252.5
2379 1501 311.1
2893 1825 378.3
3543 2235 463.3
Outgoing Harmonic Current Converted from 6.6kV (mA)
(With DC reactor, 100% operation ratio)
5th 7th 11th
2237 969 626
2673 1158 748
3254 1410 911
3927 1702 1100
4691 2033 1313
6455 2797 1807
7327 3175 2052
8182 3545 2291
9200 3987 2576
10382 4499 2907
11691 5066 3274
13146 5696 3681
14618 6335 4093
13th 17th 19th
3.773 2.107 1.519
6.391 3.569 2.573
12.86 7.181 5.177
18.48 10.32 7.440
30.34 16.94 12.21
44.58 24.90 17.95
59.75 33.37 24.06
86.32 48.20 34.75
116.2 64.89 46.78
143.2 79.98 57.66
170.9 95.46 68.82
228.7 127.7 92.07
281.8 157.4 113.5
342.7 191.4 138.0
419.7 234.4 169.0
13th 17th 19th
373 350 239
445 419 285
542 510 347
655 615 419
782 735 500
1076 1011 688
1221 1148 782
1364 1282 873
1533 1441 981
1730 1627 1107
1949 1832 1247
2191 2060 1402
2436 2290 1559
23rd 25th
1.274 0.882
2.158 1.494
4.342 3.006
6.240 4.320
10.24 7.092
15.05 10.42
20.18 13.97
29.15 20.18
39.24 27.16
48.36 33.48
57.72 39.96
77.22 53.46
95.16 65.88
115.7 80.10
141.7 98.10
23rd 25th
224 164
267 196
325 239
393 288
469 344
645 473
733 537
818 600
920 675
1038 761
1169 857
1315 964
1462 1072