Delta Electronics VFD015CB23A-21M [23/363] 1 capacity formulas

Delta Electronics VFD015CB21A-20 [23/363] 1 capacity formulas
Chapter 3 How to Select the Right AC Motor Drive|C200 Series
3-2
3-1 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=
(kVA)otor_drivety_of_AC_mthe_capaci1.5
t
N
375
GD
T
cosη973
Nk
A
2
L
×
×+
××
×
ϕ
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
++
2.3 When it is running continuously
The requirement of load capacity should be less than the capacity of AC motor
drive(kVA)
The requirement of load capacity=
)(_____
cos
kVAdrivemotorACofcapacitythe
Pk
M
×
×
ϕη
The motor capacity should be less than the capacity of AC motor drive
)(_____103
3
kVAdrivemotorACofcapacitytheIVk MM ××××
The current should be less than the rated current of AC motor drive(A)
)(______ AdrivemotorACofcurrentratedtheIk M ×

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