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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 42

Transistorized inverter, high function & low acoustic noise.
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Table 3 Equivalent Capacity Limits
Received Power Voltage
Reference Capacity
6.6kV
22/33kV
66kV or more
Table 4 Harmonic Content (Values at the fundamental current of 100%)
Reactor
5th
Not used
65
Used (AC side)
38
Used (DC side)
30
Used (AC, DC sides)
28
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 (refer to Table 2)
Pi: Rated capacity of harmonic generating equipment* [kVA]
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 for Inverter Drive
Fundamental
Applied
Wave Current
Rated Current [A]
Converted from
Motor
6.6kV
(kW (HP))
200V
400V
0.4 (0.5)
0.81
0.75 (1)
1.37
Not
1.5 (2)
2.75
applied
2.2 (3)
3.96
3.7 (5)
6.50
5.5 (7.5)
19.1
9.55
7.5 (10)
25.6
12.8
11 (15)
36.9
18.5
15 (20)
49.8
24.9
18.5 (25)
61.4
30.7
22 (30)
73.1
36.6
30 (40)
98.0
49.0
37 (50)
121
60.4
45 (60)
147
73.5
55 (75)
180
89.9
3) Harmonic suppression technique requirement
If the outgoing harmonic current is higher than; maximum value per 1kW (contract power) × contract
power, a harmonic suppression technique is required.
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50kVA
300kVA
2000kVA
7th
11th
13th
41
8.5
7.7
14.5
7.4
3.4
13
8.4
5.0
9.1
7.2
4.1
Rated
Fundamental Wave Current Converted from 6.6kV
Capacity
(mA)
(kVA)
5th
7th
49
0.57
31.85
20.09
83
0.97
53.95
34.03
167
1.95
108.6
68.47
240
2.81
156.0
98.40
394
4.61
257.1
161.5
579
6.77
376.1
237.4
776
9.07
504.4
318.2
1121
13.1
728.7
459.6
1509
17.6
980.9
618.7
1860
21.8
1209
762.6
2220
25.9
1443
910.2
2970
34.7
1931
1218
3660
42.8
2379
1501
4450
52.1
2893
1825
5450
63.7
3543
2235
31
INSTALLATION AND WIRING
17th
19th
23rd
4.3
3.1
2.6
3.2
1.9
1.7
4.7
3.2
3.0
3.2
2.4
1.6
ity: Determined by the capacity
*: Rated capac
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 d
rive.
(No reactor, 100% operation ratio)
11th
13th
17th
19th
4.165
3.773
2.107
1.519
7.055
6.391
3.569
2.573
14.20
12.86
7.181
5.177
20.40
18.48
10.32
7.440
33.49
30.34
16.94
12.21
49.22
44.58
24.90
17.95
65.96
59.75
33.37
24.06
95.29
86.32
48.20
34.75
128.3
116.2
64.89
46.78
158.1
143.2
79.98
57.66
188.7
170.9
95.46
68.82
252.5
228.7
127.7
92.07
311.1
281.8
157.4
113.5
378.3
342.7
191.4
138.0
463.3
419.7
234.4
169.0
25th
1.8
1.3
2.2
1.4
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

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