Power Supply Capacity; Inductor Of The Dc Link/ Reactance Of The Power Supply; It Networks; Dynamic Braking - WEG CFW500 Serie Manual Del Usuario

Installation and Connection

Power supply capacity

The CFW500 is suitable for use in a circuit capable of delivering not more than
„
30.000 A symmetrical (200 to 480 V).
rms
In case the CFW500 is installed in power supplies with current capacity over 30.000 A
„
it is necessary to use proper protection circuits for those power supplies, such as fuses
or circuit breakers.

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:
V
L = 1592 . ΔV .
I
s, rat
seeing that:
ΔV - desired input power supply drop, in percentage (%).
- voltage of the phase in inverter input, in volts (V).
V
e
I - inverter output rated current.
s, rat
- input power supply frequency.
f

3.2.3.3 IT Networks

ATTENTION!
When inverters with internal RFI filter are used in IT networks (neuter not
grounded or grounded through a high ohmic value resistor), always set
the grounding switch of the capacitors of the internal RFI filter to the NC
position (as shown in
damage to the filter capacitors of the inverter.

3.2.3.4 Dynamic Braking

NOTE!
The dynamic braking is available from frame B.
12 | CFW500
[ μH]
e
. f
figure A.2), since those kinds of network cause
- English -
,
rms