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Chapter 17 How to Select the Right AC Motor DriveCT2000 Series
17-1 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=
k
N
T
L
973
cos
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
The starting capacity=
k
N
cos
Acceleration time
The starting capacity=
k
N
cos
2.2 The current should be less than the rated current of AC motor drive(A)
Acceleration time
n
I
M
T
Acceleration time
n
I
M
T
2
GD
N
1
5 .
the
375
t
A
60 seconds
≦
n
n
n
k
P
1
s
s
1
C
1
T
n
60 seconds
≧
n
n
k
P
1
s
s
1
C
1
T
60 seconds
≦
n
1
k
1
1
5 .
the
_
S
S
n
T
60 seconds
≧
n
1
k
1
the
_
rated
S
S
n
T
_
capacity
_
of
_
AC
_
motor
s
k
1
5 .
the
_
capacity
s
1
T
n
s
k
the
_
capacity
s
1
n
T
rated
_
current
_
of
_
AC
_
current
_
of
_
AC
17-2
_
drive
(
kVA
)
_
of
_
AC
_
motor
_
drive
_
of
_
AC
_
motor
_
drive
_
motor
_
drive
(
A
)
_
motor
_
drive
(
A
)
(
kVA
)
(
kVA
)
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