Mitsubishi Electric A800-GF Instruction Manual page 78

• 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 (refer to
page 76), harmonics must be calculated with the following procedure:
P0 = ∑ (Ki  Pi) [kVA]
Ki: Conversion coefficient (Refer to
Pi: Rated capacity of harmonic generating equipment [kVA]

i: Number indicating the conversion circuit type
• 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
• Rated capacities and outgoing harmonic currents of inverter-driven motors
Fundamental
Applicable wave current
motor (A)
(kW)
400 V
75 123
90 147
110 179
132 216
160 258
220 355
250 403
280 450
315 506
355 571
400 643
450 723
500 804
560 900
630 1013
• Determining if a countermeasure is required
A countermeasure for harmonics is required if the following condition is satisfied: outgoing harmonic current > maximum
value per 1 kW contract power  contract power.
• Harmonic suppression techniques
No. Item
Reactor installation
1
(FR-HAL)
high power factor
2 converter
(FR-HC2)
Installation of power
3 factor improving
capacitor
Transformer multi-phase
4
operation
Passive filter
5
(AC filter)
6 Active filter
page 76)
page 76.
Fundamental
wave current Rated
converted capacity
from 6.6 kV (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
54545 638
61394 718
The converter unit (FR-CC2) is equipped with the DC reactor on its DC side, and outgoing harmonic
current can be suppressed. By installing an AC reactor (FR-HAL) on the AC side of the inverter, the
outgoing harmonic current suppression performance can be improved.
This converter trims the current waveform to be a sine waveform by switching the rectifier circuit
(converter module) with transistors. Doing so suppresses the generated harmonic amount significantly.
Connect it to the DC area of an inverter. Use the high power factor converter (FR-HC2) with the
accessories that come as standard.
When used with a reactor connected in series, the power factor improving correction capacitor can
absorb harmonic currents.
Use two transformers with a phase angle difference of 30° as in
effect corresponding to 12 pulses, reducing low-degree harmonic currents.
A capacitor and a reactor are used together to reduce impedances at specific frequencies. Harmonic
currents are expected to be absorbed greatly by using this technique.
This filter detects the current in a circuit generating a harmonic current and generates a harmonic current
equivalent to a difference between that current and a fundamental wave current to suppress the
harmonic current at the detection point. Harmonic currents are expected to be absorbed greatly by using
this technique.
PRECAUTIONS FOR USE OF THE INVERTER

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.
Outgoing harmonic current converted from 6.6 kV (mA)
(With a DC reactor, 100% operation ratio)
5th 7th 11th 13th
2237 969 626 373
2673 1158 748 445
3254 1410 911 542
3927 1702 1100 655
4691 2033 1313 782
6455 2797 1807 1076
7327 3175 2052 1221
8182 3545 2291 1364
9200 3987 2576 1533
10382 4499 2907 1730
11691 5066 3274 1949
13146 5696 3681 2191
14618 6335 4093 2436
16364 7091 4582 2727
18418 7981 5157 3070
Description
Power supply harmonics
17th 19th 23rd
350 239 224 164
419 285 267 196
510 347 325 239
615 419 393 288
735 500 469 344
1011 688 645 473
1148 782 733 537
1282 873 818 600
1441 981 920 675
1627 1107 1038 761
1832 1247 1169 857
2060 1402 1315 964
2290 1559 1462 1072
2564 1746 1636 1200
2886 1965 1842 1351
- and - combinations to provide an
25th
3
77