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Chapter 8Appendix C How to Select the Right AC Motor Drive
|VFD-S Series
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 is
⎛
×
k
N
⎜ ⎜
η
ϕ
×
×
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 the AC motor drive
The starting capacity is
×
k
N
η
×
cos
The starting capacity is
×
k
η
×
cos
2.2 The current should be less than the rated current of the AC motor drive(A)
n
T
+
n
T
C-2
⎞
2
GD
N
⎟ ⎟
+
×
≤
×
T
1
5 .
L
375
t
⎠
A
Acceleration time
≦
⎡
[
]
(
)
+
=
+
⎢
n
n
k
P
1
−
s
s
1
C
1
⎢
T
ϕ
⎢
⎣
Acceleration time
≧
N
[
]
(
)
+
=
n
n
k
P
−
s
s
1
C
1
T
ϕ
Acceleration time
≦
n
⎡
⎤
+
+
≤
I
1
k
1
1
⎛
⎞
S
−
⎢
⎜
⎟
⎥
M
S
n
⎝
⎠
⎣
⎦
T
Acceleration time
≧
n
⎡
⎤
+
≤
I
1
k
1
the
⎛
⎞
S
−
⎢
⎜
⎟
⎥
M
S
n
⎝
⎠
⎣
⎦
T
the
_
capacity
_
of
_
AC
60 seconds
n
⎤
(
)
s
≤
×
⎥
k
1
5 .
the
_
capacity
−
s
1
⎥
n
⎥
⎦
T
60 seconds
n
⎡
⎤
(
)
+
s
≤
⎢
⎥
1
k
the
_
capacity
−
s
1
⎢
⎥
n
⎢
⎥
⎣
⎦
T
60 seconds
×
5 .
the
_
rated
_
current
60 seconds
_
rated
_
current
_
_
motor
_
drive
(
kVA
_
of
_
AC
_
motor
_
of
_
AC
_
motor
_
of
_
AC
_
motor
of
_
AC
_
motor
_
drive
Revision August 2008, SE09, SW V2.61
)
_
drive
(
kVA
)
_
drive
(
kVA
)
_
drive
(
A
)
(
A
)
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