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Chapter 3 How to Select the Right AC Motor Drive|C200 Series
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=
⎛
×
k
N
⎜ ⎜
ϕ
×
×
973
η
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 ≦ 60 seconds
The starting capacity=
×
k
N
η
ϕ
×
cos
Acceleration time ≧ 60 seconds
The starting capacity=
×
k
N
η
ϕ
×
cos
2.2 The current should be less than the rated current of AC motor drive(A)
Acceleration time ≦ 60 seconds
+
n
T
Acceleration time ≧ 60 seconds
+
n
I
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=
η
The motor capacity should be less than the capacity of AC motor drive
×
k
The current should be less than the rated current of AC motor drive(A)
×
k
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⎞
GD
2
N
⎟ ⎟
+
×
≤
×
T
1.5
the_capaci
L
375
t
⎠
A
⎡
[
]
(
)
n
⎢
+
=
+
1
s
n
n
k
P
⎢
−
1
1
s
s
C
⎢
T
n
⎢
⎣
T
⎡
[
]
n
(
)
(
⎢
+
=
+
1
s
n
n
k
P
⎢
k
−
1
1
s
s
C
s
T
⎢
n
⎢
⎣
T
⎡
⎤
+
≤
×
n
1
1
1
5 .
_
⎛
⎞
I
⎢
k
⎥
the
rated
S
⎜
⎟
−
M
S
⎢
n
⎜
⎟
⎥
⎝
⎠
⎣
⎦
T
⎡
⎤
+
≤
n
1
1
_
⎛
⎞
⎢
k
⎥
the
rated
S
⎜
−
⎟
M
S
⎢
n
⎜
⎟
⎥
⎝
⎠
⎣
⎦
T
×
k
P
≤
M
_
_
the
capacity
ϕ
×
cos
×
×
×
≤
3
10
_
−
3
V
I
the
capacity
M
M
≤
_
_
I
the
rated
current
M
deltaacdrives.com
ty_of_AC_m
otor_drive
⎤
(
)
⎥
≤
×
1
5 .
_
k
the
capacity
⎥
−
1
s
⎥
⎥
⎦
⎤
)
⎥
≤
_
_
_
⎥
the
capacity
of
AC
−
1
⎥
⎥
⎦
_
_
_
current
of
AC
_
_
_
_
current
of
AC
motor
_
_
_
(
of
AC
motor
drive
kVA
_
_
_
of
AC
motor
_
_
_
_
of
AC
motor
3-2
deltaacdrives.com
sales@deltaacdrives.com
(kVA)
_
_
_
_
of
AC
motor
drive
_
_
(
)
motor
drive
kVA
_
_
(
)
motor
drive
A
_
(
)
drive
A
)
_
(
)
drive
kVA
(
)
drive
A
sales@deltaacdrives.com
(
)
kVA
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