Pre-operation instructions
13
1
• Rated capacities and outgoing harmonic currents of inverter-driven motors
• Determining if a countermeasure is required
A countermeasure for harmonics is required if the following condition is satisfied: outgoing harmonic currents >
maximum value per 1 kW contract power × contract power.
• Harmonic suppression techniques
Applicable
motor
(kW)
Fundamental
wave 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
No.
Item
Description
1
Reactor
(FR-HAL or FR-HEL)
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.
2
Multifunction
regeneration
converter
(FR-XC series)
The multifunction regeneration converter with harmonic suppression enabled switches the converter
section ON/OFF to reshape an input current waveform into a sine wave, greatly suppressing
harmonics.
Use the FR-XC series converter with the FR-XCB box-type reactor.
3
Power factor
improving capacitor
When used with a reactor connected in series, the power factor improving correction capacitor can
absorb harmonic currents.
4
Transformer multi-
phase operation
Use two transformers and establish connections with a phase angle difference of 30° (the wye to delta
connection or the delta to delta connection) to provide an effect corresponding to 12 pulses, reducing
low-degree harmonic currents.
5
Passive filter
(AC filter)
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.
6
Active filter
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.
Summary of Contents for FR-XC-11K
Page 75: ...MEMO 74 ...
Page 131: ...MEMO 130 ...
Page 155: ...MEMO 154 ...
Page 173: ...MEMO 172 ...
