Appendix C How to Select the Right AC Motor Drive|
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Revision 2016/03, 6ELE, V1.14
C-2
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=
2.2 The current should be less than the rated current of AC motor drive(A)
≦
Acceleration time 60 seconds
)(______5.111 AdrivemotorACofcurrentratedthek
n
In
SM
T
S
T
×≤++
−
≧
Acceleration time 60 seconds
)(______11 AdrivemotorACofcurrentratedthek
n
In
SM
T
S
T
≤++
−
( )
[ ]
( )
)(_____1
cos
111
kVAdrivemotorACofcapacitythek
n
n
Pknn
Nk
sCss
T
s
T
≤+=+
×
×
−−
ϕη
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