Delta VFD220B43A User Manual

Appendix C How to Select the Right AC Motor Drive_VFD-B Series
C-2 Revision 10/2005, BE13, SW V4.08
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=
ud
¸
¸
¹
·
¨
¨
©
§
u
uu
u
5.1
375cos973
2
A
L
t
NGD
T
Nk
MK
the capacity of AC motor drive (kVA)
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 Љ60 seconds
The starting capacity=
  > @  
ud 
u
u
»
»
»
¼
º
«
«
«
¬
ª

5.11
cos
111 sCss k
n
n
Pknn
Nk
T
s
T
MK
the capacity of AC motor drive(kVA)
Acceleration time Њ60 seconds
The starting capacity=
  > @  
d 
u
u
»
»
»
¼
º
«
«
«
¬
ª
 111
1
cos
sCss k
n
n
Pknn
Nk
T
s
T
MK
the capacity of AC motor drive(kVA)
2.2 The current should be less than the rated current of AC motor drive(A)
Acceleration time Љ60 seconds
ud
»
¼
º
«
¬
ª
¸
¹
·
¨
©
§

5.111 SM k
n
n
In
T
S
T
the rated current of AC motor drive(A)
Acceleration time Њ60 seconds
d
»
¼
º
«
¬
ª
¸
¹
·
¨
©
§

11 SM k
n
n
In
T
S
T
the rated current of AC motor drive(A)

Delta VFD220B43A Specifications

General

Brand	Delta
Model	VFD220B43A
Category	Controller
Language	English