Delta Electronics VFD-EL Power Supply User Manual


 
Appendix C How to Select the Right AC Motor Drive|
C-2 Revision August 2008, 2ELE, V1.02
C.1 Capacity Formulas
1. When one AC motor drive operates one motor
The starting capacity should be less than 1.5x rated capacity of AC motor drive
The starting capacity=
)(_____5.1
375cos973
2
kVAdrivemotorACofcapacitythe
t
NGD
T
Nk
A
L
×
×+
××
×
ϕη
2. When one AC motor drive operates more than one motor
2.1 The starting capacity should be less than the rated capacity of AC motor drive
Acceleration time
60 seconds
The starting capacity=
()
[]
()
)(_____5.11
cos
111 kVAdrivemotorACofcapacitythek
n
n
Pknn
Nk
sCss
T
s
T
×+=+
×
×
ϕη
Acceleration time
60 seconds
The starting capacity=
()
[]
()
)(_____1
cos
111 kVAdrivemotorACofcapacitythek
n
n
Pknn
Nk
sCss
T
s
T
+=+
×
×
ϕη
2.2 The current should be less than the rated current of 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
++