Schneider Altivar 71 VW3A7201 handleiding

Niet gecategoriseerd

Schneider

38 pagina's

PDF beschikbaar

Handleiding

6 1757361 06/2012

Checking the installation

Length of the DC bus

The maximum inductance of the DC bus connecting output PA/+, PC/- on the drive to the braking unit must not exceed a set level, as this

inductance results in an additional difference in potential on the DC bus when the IGBTs are open. To avoid an overload on the components

of the braking unit, this difference in potential must not exceed 100 VDC. The maximum inductance can be calculated using this and other

characteristics of the braking unit (value of the DC bus capacitors and absolute value of the grid current).

This inductance must always be greater than or equal to the sum of the inductance of the DC bus on the frequency inverter and the

inductance of the DC bus connection cables. The inductance of the DC bus on the frequency inverter must always be taken into

consideration. The inductance per unit of length of the cables generally used for the power supply is in the region of 0.6 µH/m.

The maximum length of the conductors l

max is calculated according to the following information:

• Values of the input capacities C

• Maximum DC voltage edge permitted during motor generator operation (ΔU

GL=100 VDC)

• Maximum AC current level for the equipment î (=2*Irms)

• Inductance per unit of length L'

• Inductance of the coil Lzkd of the DC bus

The equation below can be used to calculate l

max:

Typical capacity of the DC connection inside the braking unit

Example:

C = 200 μF,

ΔU

= 100 V, i = 271 A, a = 80 mm, r = 8.5 mm, μ

=1.257.10

-6

H/m

For longer DC bus cables, additional capacitors must be installed (Please contact your local representative)

Braking unit Power

capacity

VW3 A7 ...

7 - 45 kW 100 μF

70 - 135 kW 200 μF

160 - 200 kW 420 μF

max

CUΔ

()

⋅

-------------------------------=

max

Δ⋅

L'⋅

--------------------------

ZKD

-------------–=

Bekijk gratis de handleiding van Schneider Altivar 71 VW3A7201, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.