Input Connections; Power Supply Capacity; Inductor Of The Dc Link/ Reactance Of The Power Supply - WEG CFW500 Serie Manual Del Usuario

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Installation and Connection

3.2.3.1 Input Connections

DANGER!
Provide a disconnect device for the inverter power supply. This device must cut
off the power supply whenever necessary (during maintenance for instance).
DANGER!
Montez un dispositif de coupure sur l'alimentation du variateur. Ce composant
déconnecte l'alimentation du variateur si cela est nécessaire (ex. pendant
l'entretien et la maintenance).
ATTENTION!
The power supply that feeds the inverter must have a grounded neutral. In case
of IT networks, follow the instructions described in
on page
NOTE!
„
„

Power supply capacity

Suitable for use in circuits capable of delivering not more than 30.000 A
„
480 V or 600 V), when protected by fuses as specified in

3.2.3.2 Inductor of the DC Link/ Reactance of the Power Supply

In a general way, the inverters of the series CFW500 can be installed directly in the power supply,
without reactance in the supply. However, check the following:
In order to prevent damages to the inverter and assure the expected useful life, you must
„
have a minimum impedance that provide a voltage drop of the input power supply of 1 %. If
the impedance of the input power supply (due to the transformers and cabling) is below the
values listed in this table, we recommend the use of reactance in the input power supply.
For the calculation of the input power supply reactance necessary to obtain the desired
„
percentage voltage drop, use:
L = 1592 . ΔV .
16 | CFW500
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17.
The input power supply voltage must be compatible with the inverter rated
voltage.
Power factor correction capacitors are not needed at the inverter input (L/L1,
N/L2, L3 or R, S, T) and must not be installed at the output (U, V, W).
V
[ μH]
e
. f
I
s, rat
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Item 3.2.3.3 IT Networks
symmetrical (200 V,
rms
Table B.1 on page 141.
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