Mitsubishi Electric FR-A520-0.4K-NA Instruction Manual page 41

Table 3 Equivalent Capacity Limits
Received Power Voltage
6.6kV
22/33kV
66kV or more
Table 4 Harmonic Content (Values at the fundamental current of 100%)
Reactor
Not used
Used (AC side)
Used (DC side)
Used (AC, DC sides)
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
Applied
Rated Current [A]
Motor
(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.
Reference Capacity
50kVA
300kVA
2000kVA
5th 7th 11th
65 41 8.5
38 14.5 7.4
30 13 8.4
28 9.1 7.2
Fundamental
Rated
Wave Current
Converted from
Capacity
6.6kV
(mA) (kVA)
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
INSTALLATION AND WIRING
13th 17th
7.7 4.3
3.4 3.2
5.0 4.7
4.1 3.2
*: 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
Fundamental Wave Current Converted from 6.6kV
(No reactor, 100% operation ratio)
5th 7th 11th
31.85 20.09 4.165 3.773
53.95 34.03 7.055 6.391
108.6 68.47 14.20 12.86
156.0 98.40 20.40 18.48
257.1 161.5 33.49 30.34
376.1 237.4 49.22 44.58
504.4 318.2 65.96 59.75
728.7 459.6 95.29 86.32
980.9 618.7 128.3 116.2
1209 762.6 158.1 143.2
1443 910.2 188.7 170.9
1931 1218 252.5 228.7
2379 1501 311.1 281.8
2893 1825 378.3 342.7
3543 2235 463.3 419.7
31
19th 23rd
3.1 2.6
1.9 1.7
3.2 3.0
2.4 1.6
ity: Determined by the capacity
rive.
13th 17th 19th 23rd
2.107 1.519 1.274
3.569 2.573 2.158
7.181 5.177 4.342
10.32 7.440 6.240
16.94 12.21 10.24
24.90 17.95 15.05
33.37 24.06 20.18
48.20 34.75 29.15
64.89 46.78 39.24
79.98 57.66 48.36
95.46 68.82 57.72
127.7 92.07 77.22
157.4 113.5 95.16
191.4 138.0 115.7
234.4 169.0 141.7
25th
1.8
1.3
2.2
1.4
25th
0.882
1.494
3.006
4.320
7.092
10.42
13.97
20.18
27.16
33.48
39.96
53.46
65.88
80.10
98.10