Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 125

Fundamental
Applicable
wave current (A)
motor (kW)
200 V
75 245
90 293
110 357
132 —
160 —
220 —
250 —
280 —
315 —
355 —
400 —
450 —
500 —
560 —
630 —
 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
(FRHAL or FR-HEL)
High power factor
2
converter (FR-HC2)
Installation of power factor
3
improving capacitor
Transformer multi-phase
4
operation
5 Passive filter (AC filter)
Active filter
6
(Active filter)
124
3. PRECAUTIONS FOR USE OF THE INVERTER
3.2 Power supply harmonics
Fundamental
Rated
wave current
capacity
converted from
(kVA)
400 V
6.6 kV (mA)
123 7455 87.2
147 8909 104
179 10848 127
216 13091 153
258 15636 183
355 21515 252
403 24424 286
450 27273 319
506 30667 359
571 34606 405
643 38970 456
723 43818 512
804 48727 570
900 54545 638
1013 61394 718
Install an AC reactor (FR-HAL) on the AC side of the inverter or a DC reactor (FR-HEL) on its DC side,
or install both to suppress outgoing harmonic currents.
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° in combinations of
provide an 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.
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
17th 19th 23rd 25th
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
to ∆ and ∆ to ∆, to