Delta VFD-E Series, User Manual

Page: 322 / 435

C-2
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=
) ( _ _ _ _ _ 5 . 1
375 cos 973
2
kVA drive motor AC of capacity the
t
N GD
T
N k
A
L
 






 
 

 
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
    












 
 

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
   












 
 
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
  












