Mitsubishi FR - S500 instruction manual Conversion Factors for FR-S500 Series

Table 2 Conversion Factors for FR-S500 Series

Class		Circuit Type	Conversion Factor (Ki)
	3-phase bridge	Without reactor	K31 =	3.4
		With reactor (AC side)	K32 =	1.8
3	(Capacitor-
		With reactor (DC side)	K33 =	1.8
	smoothed)
		With reactors (AC, DC sides)	K34 =	1.4

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 at the fundamental current of 100%)

Reactor	5th	7th	11th	13th	17th	19th	23rd	25th
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)	30	13	8.4	5.0	4.7	3.2	3.0	2.2
Used (AC, DC	28	9.1	7.2	4.1	3.2	2.4	1.6	1.4
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

*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.

2)Calculation of outgoing harmonic current

Outgoing harmonic current = fundamental wave current (value converterd 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.

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