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CHAPTER 8 - CFW-09 OPTIONS AND ACCESSORIES
NOTE!
Do not remove the gaskets inside the cable glands, which were not used.
They are necessary to guarantee NEMA 4X protection.
To specify a NEMA 4X inverter, it is necessary to include the term “N4” in the
field “Enclosure Degree of Protection” according to the CFW-09 specification
in chapter 2, item 2.4 (CFW-09 Identification). Remember that the NEMA 4X
line is only up to 10 hp.
The CFW-09HD inverter line, supplied by DC Link, has the same installation,
mechanical, programming and performance characteristics as the Standard
CFW-09 line;
Up to size 5, an HD inverter is required to make the supply through the DC
Link. In this case is sufficient to supply a standard inverter through the DC
Link with an external pre-charge circuit;
The models of size 6 and larger are fitted with an internal pre-charge
circuit and have internal changes;
For more detail, refer please to the Addendum of the CFW-09 Frequency
Inverter Manual of the CFW-09HD line – supplied by DC Link. (Refer to
www.weg.net).
There are two problems associated to a conventional inverter with diode bridge
at the input: harmonics injection to the network and braking of loads with high
inertia, or that run at high speeds and require short braking times. The
harmonic injection to the network happens with any type of load. The braking
problems appear with loads such as sugar centrifuges, dynamometers, cranes
and winders. The CFW-09 converter with RB option (Regenerative Braking) is
WEG solution for these problems (refer to figure 8.58).
Shows the main components of a inverter with CFW-09 RB.
8.16.5
How to Specify
8.17
CFW-09 SUPPLIED
BY THE DC LINK –
LINE HD
8.18
CFW-09 RB
REGENERATIVE
CONVERTER
Supply
Motor
Input Reat.
Filter
Figure 8.58
- Simplified diagram of a driving with CFW-09 RB
