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Appendix 7 - 3
MDS-D-SVJ3/SPJ3 Series Instruction Manual
Appendix 7-1 Higher harmonic suppression measure guidelines
Appendix 7-1-1 Calculating the equivalent capacity of the higher harmonic generator
As a principle, the higher harmonic suppression measure guidelines must be followed by the customer.
(1) Calculating the total equivalent capacity (Step 1)
Calculate the total equivalent capacity with the following expression.
Total equivalent circuit: Po = Σ • Ki • Pi
Ki :Conversion coefficient (Refer to following table)
Pi :Rated input capacity of each device
(Table 1) Rated capacity of each unit
(Note) The rated capacity Pi above, is the value used to calculate whether the product corresponds to the
higher harmonic guidelines. Thus, the value will differ from the actual power facility's capacity.
(Table 2) Circuit class and conversion coefficient for each unit
(Table 3) Limit values for total equivalent capacity
If the total equivalent capacity Po exceeds the limit value given in (Table 3), proceed to "1.2 Calculating
the higher harmonic current flow" below.
Measures are not required if the value is not exceeded.
Unit type
MDS-
Rated input
capacity
pi [kVA]
Unit type
MDS-
Rated input
capacity
pi [kVA]
SPJ3-075NA 0.97 SVJ3-03NA 0.6
SPJ3-22NA 2.81 SVJ3-04NA 0.8
SPJ3-37NA 4.61 SVJ3-07NA 1.2
SPJ3- 55NA 6.77 SVJ3-10NA 1.6
SPJ3-75NA 9.07 SVJ3-20NA 2.7
SPJ3-110NA 13.1 SVJ3-35NA 4.7
Name Model
Circuit
class
Circuit type
Conversion
coefficient
Ki
Servo drive unit MDS-D-SVJ3 Series 3
3-phase bridge (with smoothing capacitor)
With AC reactor
K32=1.8
Spindle drive unit MDS-D-SPJ3 Series 3
3-phase bridge (with smoothing capacitor)
With AC reactor
K32=1.8
Incoming voltage Total of 6-pulse equivalent capacity
6.6kV 50kVA
22/33kV 300kVA
66kV or more 2,000kVA