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Appendix C How to Select the Right AC Motor Drive|VFD-B 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=
⎛
×
k
N
⎜ ⎜
T
η
ϕ
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
The starting capacity=
×
k
N
η
×
cos
The starting capacity=
×
k
η
×
cos
2.2 The current should be less than the rated current of AC motor drive(A)
n
+
n
T
2.3 When it is running continuously
C-2
⎞
2
GD
N
⎟ ⎟
+
×
≤
×
1
5 .
the
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
T
ϕ
Acceleration time
≦
n
⎡
⎤
+
+
≤
I
1
k
1
⎛
⎞
S
−
⎜
⎟
M
⎢
S
⎥
n
T
⎝
⎠
⎣
⎦
T
Acceleration time
≧
n
⎡
⎤
+
≤
I
1
k
1
the
⎛
⎞
S
−
⎢
⎜
⎟
⎥
M
S
n
⎝
⎠
⎣
⎦
T
_
capacity
_
of
_
AC
60 seconds
n
⎤
(
)
+
s
≤
×
⎥
k
1
5 .
the
_
−
s
1
⎥
n
⎥
⎦
T
60 seconds
n
⎡
⎤
(
)
+
s
≤
⎢
⎥
1
k
the
_
−
C
1
s
1
⎢
⎥
n
⎢
⎥
⎣
⎦
T
60 seconds
×
1
5 .
the
_
rated
_
current
60 seconds
_
rated
_
current
Revision July 2008, BE16, SW V4.08 & V5.00
_
motor
_
drive
(
kVA
capacity
_
of
_
AC
_
motor
capacity
_
of
_
AC
_
motor
_
of
_
AC
_
motor
_
of
_
AC
_
motor
)
_
drive
(
kVA
)
_
drive
(
kVA
)
_
drive
(
A
)
_
drive
(
A
)
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