Mitsubishi Electric FR-HC2-7.5K Instruction Manual page 10

(1) Application of the Harmonic Suppression Guideline for Specific Consumers
Classification
Three-phase bridge
3
(Capacitor smoothed)
Self-excitation three-phase
5
bridge
Table 3 Equivalent Capacity Limits
Received Reference
Power Voltage Capacity
6.6kV 50kVA
22/33kV 300kVA
2000kVA
66kV or more
Table 4 Harmonic Content (Values at the fundamental current of 100%)
Reactor
Not used
Used (AC side)
Used (DC side)
Used (on AC/DC side)
(a) 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 a consumer's harmonic
generating equipment and is calculated with the following equation. When the sum of equivalent capacity exceeds the limits
in Table 3, harmonics must be calculated in the following procedure.
P0 =  (Ki Pi) [kVA]
Ki: Conversion factor(According to Table 2)
Pi: Rated capacity of harmonic generating equipment
i : Number indicating the conversion circuit type
(b) Calculation of outgoing harmonic current
Outgoing harmonic current=fundamental wave current (value converted 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.
Install, add or renew
equipment
Calculation of equivalent
capacity total
Equal to or less
than reference
capacity Equivalent
capacity total
Above reference
capacity
Calculation of outgoing
harmonic current
Not more than
harmonic current upper
limit?
Equal to or less
than upper limit
Harmonic suppression
measures unnecessary
Table 2 Conversion Factors for FR-A700 Series
Circuit Type
Without a reactor
With a reactor (on AC side)
With a reactor (on DC side)
Without a reactor (on AC/DC side)
With the converter
5th 7th 11th
65 41 8.5
38 14.5 7.4
30 13 8.4
28 9.1 7.2
[kVA]

Pre-operation instructions
More than upper limit
Harmonic suppression
measures necessary
13th 17th
7.7 4.3
3.4 3.2
5.0 4.7
4.1 3.2
 Rated capacity: Rated capacity is 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 generated harmonic amount and is different from the power
supply capacity required for actual inverter drive.
Conversion Factor Ki
K31=3.4
K32=1.8
K33=1.8
K34=1.4
K5=0
19th 23rd 25th
3.1 2.6 1.8
1.9 1.7 1.3
3.2 3.0 2.2
2.4 1.6 1.4
1
3