Notes On Circuits And Devices - WEG CFW-11 Installation Manual

R/L1 S/L2 T/L3 DC- BR
Ground
(b) Size D
Ground
(4xM8, 4xM5)
(c) Size E
Figure 14 (b) and (c): Power and grounding terminals sizes D and E
Ground
(a) Standard
(b) Special Hardware DC
Figure 15 (a) and (b): Power and grounding terminals sizes F and G
DC+ U/T1 V/T2 W/T3
DC-
DC+
1
3
5
Figure 16: Connection of dynamic braking module in standard models of
sizes F and G

NOTES ON CIRCUITS AND DEVICES

ƒ
The power supply that feeds the inverter must have a grounded
neutral. For IT networks some internal components must be
disconnected as shown in figures 17
ƒ
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).
ƒ
Use high speed fuses at the input for the protection of the inverter
rectifier and wiring. Refer to tables A.1
appropriate fuse rating (I t must be equal to or less than indicated in
2
tables, considering the cold (and not the fusion) current extinction
value).
ƒ
In order to meet UL requirements, use class J fuses at the inverter
supply with a current not higher than the values of
A.2.
ƒ
Optionally, slow blow fuses can be used at the input. They must be
sized for 1.2 x the rated input current of the inverter. In this case,
the installation is protected against short-circuit, but not the inverter
input rectifier. This may result in higher damage to the inverter in
the event of an internal component failure.
ƒ
The CFW-11 inverters are suitable for use on a circuit capable
of delivering up to a maximum of 100.000 Arms symmetrical
(230 V / 480 V).
ƒ
Motor shielded cable recommended according to IEC 60034-25.
ƒ
Keep motor cables at least 25 cm (9.84 in) distant from other cables
as signal cables, sensor cables, control cables, etc.
Installation Guide
2
4
6
to 19.
and A.2 for selecting the
tables A.1 and
CFW-11 | 11