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Delta VFD-EL-W Series - Capacity Formulas

Delta VFD-EL-W Series
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Appendix C. How to Select the Right AC Motor DriveVFD-EL-W
207
C-1 Capacity Formulas
1. One AC motor drive operates one motor
The starting capacity should be less than 1.5x the rated capacity of the AC motor drive.
The starting capacity equals:
)(_____5.1
375cos973
2
kVAdrivemotorACofcapacitythe
t
NGD
T
Nk
A
L
2. One AC motor drive operates more than one motor
The starting capacity should be less than the rated capacity of the AC motor drive.
Acceleration time 60 seconds
The starting capacity equals:
)(_____5.11
cos
111 kVAdrivemotorACofcapacitythek
n
n
Pknn
Nk
sCss
T
s
T
Acceleration time 60 seconds
The starting capacity equals:
The current should be less than the rated current of the AC motor drive (A).
Acceleration time 60 seconds
)(______5.111 AdrivemotorACofcurrentratedthek
n
n
In SM
T
S
T
Acceleration time 60 seconds
)(______11 AdrivemotorACofcurrentratedthek
n
n
In SM
T
S
T
When running continuously
The load capacity requirement should be less than the capacity of the AC motor drive (kVA).
The load capacity requirement equals:
)(_____
cos
kVAdrivemotorACofcapacitythe
Pk M
The motor capacity should be less than the capacity of the AC motor drive.
)(_____103
3
kVAdrivemotorACofcapacitytheIVk MM
The current should be less than the rated current of the AC motor drive (A).
)(______ AdrivemotorACofcurrentratedtheIk M
)(_____1
cos
111 kVAdrivemotorACofcapacitythek
n
n
Pknn
Nk
sCss
T
s
T

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