Mitsubishi Electric FR-A820-00046 Instruction Manual page 135

Precautions for use of the inverter
Classification
3
5
Tab. 3-8:
Tab. 3-9:
Reactor
Not used
Used (AC side)
Used (DC side)
Used (AC, DC sides)
Tab. 3-10:
● Calculation of equivalent capacity P0 of harmonic generating equipment
"Equivalent capacity" is the capacity of a 6-pulse converter converted from the capacity of
consumer's harmonic generating equipment and is calculated by the following equation: If the
sum of equivalent capacities is higher than the limit in tab. 3-9, harmonics must be calculated with
the following procedure:
P0 = ∑ (Ki × Pi) [kVA]
Ki: Conversion coefficient (refer to tab. 3-8)
Pi: Rated capacity of harmonic generating equipment
i: Number indicating the conversion circuit type
Rated capacity: Determined by the capacity of the applied motor and found in tab. 3-11. The
rated capacity used here is used to calculate the generated harmonic amount and is different
from the power supply capacity required for actual inverter drive.
FR-A800
Three-phase bridge
(Capacitor smoothing)
Self-excitation three-phase
bridge
Conversion factors
Received power voltage
6.6 kV
22/33 kV
66 kV
Equivalent capacity limits
5th 7th
65 41
38 14.5
30 13
28 9.1
Harmonic content (Values of the fundamental current is 100%)
Circuit type
Without reactor
With reactor (AC side)
With reactor (DC side)
With reactors (AC, DC sides)
When a high power factor converter is
used
11th 13th 17th
8.5 7.7 4.3
7.4 3.4 3.2
8.4 5.0 4.7
7.2 4.1 3.2
[kVA]
Power supply harmonics
Conversion coefficient Ki
K31 = 3.4
K32 = 1.8
K33 = 1.8
K34 = 1.4
K5 = 0
Reference capacity
50 kVA
300 kVA
2000 kVA
19th 23rd
3.1 2.6
1.9 1.7
3.2 3.0
2.4 1.6
25th
1.8
1.3
2.2
1.4
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