Input Connections; Power Supply Capacity; Dynamic Braking (Standard Built-In For Frame Sizes A, B, C And D And Optional Built-In For Frame Size E - Cfw700 - WEG CFW700 Serie Manual Del Usuario

Installation and Connection

3.2.3.1 Input Connections

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!
The power supply that feeds the inverter shall have a solid grounded neutral.
In case of IT networks, follow the instructions described below.
ATTENTION!
In order to be able to use the CFW700 with built-in C3 RFI filter (frame sizes A, B, C
and D with optional RFI filter and all frame size E inverter models - CFW700...C3...)
in IT networks (neutral conductor not grounded or grounded via a high ohmic value
resistor) or in corner-grounded delta systems, it is necessary to remove some RFI
filter components (capacitor for frame sizes A, B, C and D and capacitor and the
MOV for frame size E) connected to the ground by removing the screws indicated
in Figure A.8 on page 214
position of the J1 jumper on the PRT1 board from
to the Figure A.8 on page 214

3.2.3.2 Power Supply Capacity

Suitable for circuits with capacity to deliver no more than:
100 kA symmetric at 240 V, 480 V or 600 V when the inverter is protected by fuses.
„
65 kA symmetric at 240 V or 480 V when the inverter is protected by reverse-type circuit
„
breakers.
14 kA symmetric at 600 V when the inverter is protected by reverse-type circuit breakers.
„
For compliance with UL standard and specification of current of fuses and circuit breaker see
Table B.1 on page 218
In case the CFW700 is installed in power supplies with current capacity higher than 100.000
A , it is necessary to provide adequate protections circuits such as fuses or switches.
rms
3.2.3.3 Dynamic Braking (standard built-in for frame sizes A, B, C and D and
optional built-in for frame size E - CFW700...DB...)
Refer to Table B.1 on page
the following dynamic braking specifications: maximum current, resistance, RMS current (*)
and cable gauges.
The power rating of the dynamic braking resistor is a function of the deceleration time, the load
inertia and the resistant torque.
16 | CFW700
for inverter frame sizes A, B, C and D and changing the
for inverter frame size E.
to Table B.3 on page 220.
218, Table B.2 on page 219
(XE1) to "NC" (XIT), according
and Table B.3 on page 220 for