Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual page 57

EMC and leakage currents
Not used
Three-phase bridge
Used (AC side)
(Capacitor smoothing) Used (DC side)
Used (AC, DC sides) 28
Single-phase bridge Not used
(Capacitor smoothing) Used (AC side) *
∗ The harmonic contents for "single-phase bridge/with reactor" in the table 4 are values when the reactor value is 20%. Since a 20% reactor is large and
considered to be not practical, harmonic contents when a 5% reactor is used is written in the technical data JEM-TR201 of The Japan Electrical
Manufacturers' Association and this value is recommended for calculation for the actual practice.
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
Rated Current [A]
Applicable
Motor (kW)
200V
0.4 1.61
0.75 2.74
1.5 5.50
2.2 7.93
3.7 13.0
5.5 19.1
7.5 25.6
11 36.9
15 49.8
3) Application of the guideline for specific consumers
If the outgoing harmonic current is higher than the maximum value per 1kW contract power × contract power, a harmonic
suppression technique is required.
4) Harmonic suppression techniques
No. Item
Reactor installation
1
(FR-HAL, FR-HEL)
High power factor converter
2
(FR-HC)
Installation of power factor
3
improving capacitor
Transformer multi-phase
4
operation
Passive filter
5
(AC filter)
Active filter
6
(Active filter)
48
Table 4 Harmonic Contents (Values at the fundamental current of 100%)
Reactor 5th
65
38
30
50
6.0
Fundamental
Wave Current
Converted
from 6.6kV
400V
(mA)
0.81 49
1.37 83
2.75 167
3.96 240
6.50 394
9.55 579
12.8 776
18.5 1121
24.9 1509
Install an AC reactor (FR-HAL) on the AC side of the inverter or a DC reactor (FR-HEL) on its DC side
or both to suppress outgoing harmonic currents.
The converter circuit is switched on-off to convert an input current waveform into a sine wave,
suppressing harmonic currents substantially. The high power factor converter (FR-HC) is used with the
standard accessory.
When used with a series reactor, the power factor improving capacitor has an effect of absorbing
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, producing a
great effect of absorbing harmonic currents.
This filter detects the current of 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 a
harmonic current at a detection point, providing a great effect of absorbing harmonic currents.
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
24 5.1 4.0
3.9 1.6 1.2
∗ Rated capacity: Determined by the capacity 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 drive.
Outgoing Harmonic Current Converted from 6.6kV(mA)
Rated
(No reactor, 100% operation ratio)
Capacity
5th 7th
(kVA)
0.57 31.85 20.09
0.97 53.95 34.03
1.95 108.6 68.47
2.81 156.0 98.40
4.61 257.1 161.5
6.77 376.1 237.4
9.07 504.4 318.2
13.1 728.7 459.6
17.6 980.9 618.7
Description
17th 19th
4.3 3.1 2.6
3.2 1.9 1.7
4.7 3.2 3.0
3.2 2.4 1.6
1.5 1.4
0.6 0.1
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
-Δ, Δ-Δ combination to provide an
23rd 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