Power Supply Capacity; Power Supply Reactance - WEG CF W100 Serie Manual Del Usuario

NOTE!
The input power supply voltage must be compatible with the inverter rated voltage.
„
Power factor correction capacitors are not needed at the input (L/L1, N/L2) and must not be installed
„
at the output (U, V, W).

Power supply capacity

The CFW100 is suitable for use in circuits capable of delivering not more than 30.000 A
„
column "Voltage") Volts Maximum, when protected by fuses or circuit breakers as specified in
page 93 or Table B.5 on page
For inverter's semiconductor protection, use the WEG recommended class aR semiconductor fuses, according
„
to Table B.4 on page 93.
For protection in compliance with UL standard, use the protection according to
„
In case the CFW100 is installed in power supplies with current capacity over the SCCR value specified, it
„
is necessary to use protection circuits, such as fuses or circuit breakers, proper for those power supplies.
ATTENTION!
The opening of the branch-circuit protective device may be an indication that a fault current has been
interrupted. To reduce the risk of fire or electric shock, current-carrying parts and other components
of the inverter or cabinet should be examined and replaced if damaged. If burnout of the current
element of an overload relay occurs, the complete overload relay must be replaced.

3.2.3.2 Power Supply Reactance

In a general way, the inverters of the CFW100 line 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 ensure the expected useful life, it is necessary a minimum line
„
impedance that provides a voltage drop of 1 %. For lower values (due to the transformers and cables), it is
recommended to use a line reactance.
For the calculation of the line reactance necessary to obtain the desired percentage voltage drop, use:
„
Seeing that:
ΔV - desired line drop, in percentage (%).
V - phase voltage in the inverter input, in volts (V).
e
I - rated current of the inverter output.
s, rat
f - line frequency.
NOTE!
The WEG reactances available for the CFW100 line are reported in
93.
L = 1592 . ΔV .
I
s, nom
Installation and Connection
Table B.5 on page
V
e
[μH]
. f
Table B.7 on page
symmetrical at (see
rms
Table B.4 on
93.
94.
CFW100 G2 | 15