Mitsubishi Electric FR-E700EX Instruction Manual page 51

EMC and leakage currents
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 = (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 Drive unit Drive
Rated
Current
Applicable
[A]
Motor (kW)
200V
0.1
0.61
0.2 0.98
0.4
1.61
0.75 2.74
1.5 5.50
2.2 7.93
3.7 13.0
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
2 converter
(FR-HC2)
Installation of power
3 factor improving
capacitor
Transformer multi-phase
4
operation
Passive filter
5
(AC filter)
6 Active filter
40
Fundamental
Wave Current Rated
Converted Capacity
from 6.6kV (kVA)
(mA)
18 0.22
30 0.35
49 0.57
83 0.97
167 1.95
240 2.81
394 4.61
Install an AC reactor (FR-HAL) on the AC side of the drive unit or a DC reactor (FR-HEL) on its DC side
or both to suppress outgoing harmonic currents.
This converter trims the current waveform to be a sine waveform by switching in the rectifier circuit
(converter module) with transistors. Doing so suppresses the generated harmonic amount significantly.
Connect it to the DC area of a drive unit. The high power factor converter (FR-HC2) 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.
 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 drive
unit drive.
Outgoing Harmonic Current Converted from 6.6kV(mA)
(No reactor, 100% operation ratio)
5th 7th 11th 13th
11.7 7.38 1.53 1.386
19.5 12.3 2.55
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
Description
17th 19th 23rd
0.774 0.558 0.468
2.31 1.29 0.93 0.78
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
-, - combination to provide an
25th
0.324
0.54
0.882
1.494
3.006
4.320
7.092