# Mitsubishi Electric FR-E520 Instruction Manual Page 50

Transistorized inverter.

Table 2 Conversion Factors for FR-E500 Series
Class
3-phase bridge
3
(Capacitor-smoothed)
Self-exciting 3-phase
5
bridge
Table 3 Equivalent Capacity Limits
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=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 converterd from received
• Operation ratio: Operation ratio = actual load factor × operation time ratio
• Harmonic content: Found in Table 4.
Circuit Type
Without reactor
With reactor (AC side)
With reactor (DC side)
With reactors (AC, DC sides)
When high power factor
converter is used
Reference Capacity
50 kVA
300 kVA
2000 kVA
5th
7th
65
41
38
14.5
30
13
28
9.1
power voltage) × operation ratio × harmonic content
during 30 minutes
INSTALLATION AND WIRING
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
* 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.
40
Conversion Factor (Ki)
K31 = 3.4
K32 = 1.8
K33 = 1.8
K34 = 1.4
K5 = 0
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