Input Connections; Power Supply Capacity; It Networks - WEG CFW501 Serie Manual Del Usuario

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).
ATTENTION!
The power supply that feeds the inverter must have a grounded
neutral. In case of IT networks, follow the instructions described in
item 3.2.3.3 - IT
NOTE!
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).
The maximum impedance of the input power supply permitted is 1 %
„
of the voltage drop. It is not permitted the use of inducer on the DC link.

Power supply capacity

The CFW501 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 CFW501 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 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.
Networks.
figure A.2), since those kinds of network cause
Installation and Connection
CFW501 | 13
,
rms