MITSUBISHI ELECTRIC FR-S520E - Manual (Page 32)

22
Main circuit terminals
* K42=0.35 is a value when the reactor value is 20%. Since a 20% reactor is large and
considered to be not practical, K42=1.67 is written as conversion factor for a 5% reactor in
the technical data JEM-TR201 of the Japan Electric Machine Industry Association and this
value is recommended for calculation for the actual practice.
* 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 Electric Machine Industry 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:
Table 2 Conversion Factors for FR-S500 Series
Circuit Type Conversion Factor (Ki)
Three-phase bridge
(Capacitor-smoothed)
Without reactor K31 = 3.4
With reactor (AC side) K32 = 1.8
With reactor (DC side) K33 = 1.8
With reactors (AC, DC sides) K34 = 1.4
Single-phase bridge
(capacitor smoothed) Without reactor K41 = 2.3
With reactor (AC side) K42 = 0.35 *
Table 3 Equivalent Capacity Limits
Received Power Voltage Reference Capacity
6.6kV 50 kVA
22/33 kV 300 kVA
66kV or more 2000 kVA
Table 4 Harmonic Contents (Values of the fundamental current is 100%)
Reactor 5th 7th 11th 13th 17th 19th 23rd 25th
Three-phase
bridge
(capacitor
smoothed)
Not used 65 41 8.5 7.7 4.3 3.1 2.6 1.8
Used (AC side) 38 14.5 7.4 3.4 3.2 1.9 1.7 1.3
Used (DC side) or
with filter pack
30 13 8.4 5.0 4.7 3.2 3.0 2.2
Used (AC, DC
sides)
28 9.1 7.2 4.1 3.2 2.4 1.6 1.4
Single-phase
bridge
(capacitor
smoothed) Without reactor 50 24 5.1 4.0 1.5 1.4  
With reactor (AC
side) *
6.0 3.9 1.6 1.2 0.6 0.1  
P0= Σ (Ki × Pi) [kVA]
Ki: Conversion factor (refer to Table 2)
Pi: Input rated capacity of harmonic
generating equipment* [kVA]
i: Number indicating the conversion
circuit type
* Input 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.