Power Connections; Input Connections - WEG CFW-11 User Manual

Installation and Connection

3.2.3 Power Connections

3.2.3.1 Input Connections

3
DANGER!
Provide a disconnect device for the input power supply of the inverter.
This device shall disconnect the input power supply for the inverter when needed (for instance, during
servicing).
ATTENTION!
A contactor or another device that frequently disconnects and reapplies the AC supply to the inverter
in order to start and stop the motor may cause damage to the inverter power section. The drive is
designed to use control signals for starting and stopping the motor. If used for that purpose, the input
device must not exceed one operation per minute otherwise the inverter may be damaged.
ATTENTION!
The power supply that feeds the inverter shall have a grounded neutral. In case of IT networks, follow
the instructions described in item 3.2.3.1.1.
NOTE!
The input power supply voltage shall be compatible with the inverter rated voltage.
NOTE!
Power factor correction capacitors are not needed at the inverter input (R, S, T) and shall not be
installed at the output of the inverter (U, V, W).
AC power supply considerations
The CFW-11 inverters are suitable for use on a circuit capable of deliviering up to a maximum of 100,000 A
symmetrical (230 V / 480 V).
3-14
PE R S T U V W PE
PE
R
S
T
Power Disconnect
Fuses
Supply Switch
Figure 3.12 - Power and grounding connections
PE W V U
Shielding
rms