WEG CFW-11 Series - Notes on Circuits and Devices; It Networks

Installation Guide
12 | CFW-11
ENGLISH
21
43
5 6
(a) Frame sizes F and G
1 2
3
Remove cover
(b) Frame size H
Figure 18: Connection of dynamic braking module in standard models of
sizes F, G and H
NOTES ON CIRCUITS AND DEVICES

The power supply that feeds the inverter must have a grounded
neutral. For IT networks some internal components must be
disconnected as shown in figure 19 to 22.

Provide a disconnect device for the input power supply of the
inverter. This device must disconnect the input power supply for
the inverter when needed (for instance, during servicing).

Suitable for circuits with capacity to deliver no more than:
- 100 kA symmetric at 240 V or 480 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.

The fuse to be used in the input must have current and I
2
t equal
to or smaller than the specification in tables A .1, A.2, A.3 and A.4
[consider the cold current extinction value (not the melting value)]
to protect the input rectifier diodes of the inverter and of the wiring.

For compliance with the UL standard and current specifications for
the fuses and circuit breaker, refer to the User's Manual available
for download on: www.weg.net.

Motor shielded cable recommended according to IEC 60034-25.

Keep motor cables at least 25 cm (9.84 in) distant from other cables
as signal cables, sensor cables, control cables, etc.
IT NETWORKS
When the neutral is not grounded, or the grounding is provided
by a high ohm value resistor or in grounded delta networks (“delta
corner earth”).
XE2
XE1
XE2
XE1
(a) Frame size A
(b) Frame size B
(c) Frame size C
XE2
XE1
(d) Frame size D
XE1 XE2
Figure 19 (a) to (d): Frame size A to D - Location of Grounding Screws
- Remove for IT networks or delta-grounded