Delta Electronics AC Drive VFD-F Series Spécifications télécharger pdf (Page 179)

Chapter 8Appendix C How to Select the Right AC Motor Drive

|VFD-S Series

C-2 Revision August 2008, SE09, SW V2.61

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 is

)(_____5.1

375cos973

kVAdrivemotorACofcapacitythe

NGD

×≤

⎟

⎠

⎞

⎜

⎝

⎛

×+

××

ϕη

2. When one AC motor drive operates more than one motor

2.1 The starting capacity should be less than the rated capacity of the AC motor drive



Acceleration time

≦

60 seconds

The starting capacity is

()

[]

()

)(_____5.11

cos

111 kVAdrivemotorACofcapacitythek

Pknn

sCss

×≤+=+

⎥

⎦

⎤

⎢

⎣

⎡

−−

ϕη



Acceleration time

≧

60 seconds

The starting capacity is

()

[]

()

)(_____1

cos

111 kVAdrivemotorACofcapacitythek

Pknn

sCss

≤+=+

⎥

⎦

⎤

⎢

⎣

⎡

−−

ϕη

2.2 The current should be less than the rated current of the AC motor drive(A)



Acceleration time

≦

60 seconds

)(______5.111 AdrivemotorACofcurrentratedthek

In SM

×≤++

⎥

⎦

⎤

⎢

⎣

⎡

⎟

⎠

⎞

⎜

⎝

⎛

−



Acceleration time

≧

60 seconds

)(______11 AdrivemotorACofcurrentratedthek

In SM

T ≤++

⎥

⎦

⎤

⎢

⎣

⎡

⎟

⎠

⎞

⎜

⎝

⎛

−

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