Mitsubishi FR - S500 Instruction Manual page 31

Table 2 Conversion Factors for FR-S500 Series
Class
3-phase bridge
3 (Capacitor-
smoothed)
Table 3 Equivalent Capacity Limits
Received Power Voltage
6.6kV
22/33 kV
66kV or more
Table 4 Harmonic Contents (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 (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 converterd from
Operation ratio: Operation ratio = actual load factor
Harmonic content: Found in Table 4.
Circuit Type
Without reactor
With reactor (AC side)
With reactor (DC side)
With reactors (AC, DC sides)
50 kVA
300 kVA
2000 kVA
5th 7th 11th
65 41
38 14.5
30 13
28 9.1
received power voltage)
content
30 minutes
Reference Capacity
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
*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 a generated
harmonic amount and is different
from the power supply capacity
required for actual inverter drive.
22
Conversion Factor (Ki)
K31 3.4
K32 1.8
K33 1.8
K34 1.4
19th 23rd
3.1 2.6
1.9 1.7
3.2 3.0
2.4 1.6
operation ratio harmonic
operation time ratio during
25th
1.8
1.3
2.2
1.4