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_drive
ty_of_AC_m
the_capaci
1.5
t
N
375
GD
T
cos
η
973
N
k
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
.
1
1
cos
1
1
1
kVA
drive
motor
AC
of
capacity
the
k
n
n
P
k
n
n
N
k
s
C
s
s
T
s
T
×
≤
+
=
+
×
×
⎥
⎥
⎥
⎥
⎦
⎤
⎢
⎢
⎢
⎢
⎣
⎡
−
−
ϕ
η
Acceleration
time
≧
60 seconds
The starting capacity=
( )
[
]
( )
)
(
_
_
_
_
_
1
cos
1
1
1
kVA
drive
motor
AC
of
capacity
the
k
n
n
P
k
n
n
N
k
s
C
s
s
T
s
T
≤
+
=
+
×
×
⎥
⎥
⎥
⎥
⎦
⎤
⎢
⎢
⎢
⎢
⎣
⎡
−
−
ϕ
η
2.2 The current should be less than the rated current of AC motor drive(A)
Acceleration
time
≦
60 seconds
)
(
_
_
_
_
_
_
5
.
1
1
1
A
drive
motor
AC
of
current
rated
the
k
n
n
I
n
S
M
T
S
T
×
≤
+
+
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
Acceleration
time
≧
60 seconds
)
(
_
_
_
_
_
_
1
1
A
drive
motor
AC
of
current
rated
the
k
n
n
I
n
S
M
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
kVA
drive
motor
AC
of
capacity
the
P
k
M
≤
×
×
ϕ
η
The motor capacity should be less than the capacity of AC motor drive
)
(
_
_
_
_
_
10
3
3
kVA
drive
motor
AC
of
capacity
the
I
V
k
M
M
≤
×
×
×
×
−
The current should be less than the rated current of AC motor drive(A)
)
(
_
_
_
_
_
_
A
drive
motor
AC
of
current
rated
the
I
k
M
≤
×
Call 1(800)985-6929 for Sales
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Call 1(800)985-6929 for Sales
deltaacdrives.com
sales@deltaacdrives.com
