INVT GD20-004G-2-EU, Руководство по эксплуатации

Страница: 29 / 168

Goodrive20-EU series VFD Installation guide
25
VFD
Fuse
Input cable(three phase)
M
3~
Figure 3-16 Fuse configuration
Note: Select the fuse as the manual indicated. The fuse will protect the input power cable from
damage in short-circuit situations. It will protect the surrounding devices when the internal of
the VFD is short circuited.
3.4.2 Protecting the motor and motor cables
The VFD protects the motor and motor cable in a short-circuit situation when the motor cable
is dimensioned according to the rated current of the VFD. No additional protection devices are
needed.

If the VFD is connected to multiple motors, a separate thermal overload
switch or a circuit breaker must be used for protecting each cable and
motor. These devices may require a separate fuse to cut off the
short-circuit current.
3.4.3 Implementing a bypass connection
It is necessary to set power frequency and variable frequency conversion circuits for the
assurance of continuous normal work of the VFD if faults occur in some significant situations.
In some special situations, for example, if it is only used in soft start, the VFD can be
converted into power frequency running after starting and some corresponding bypass should
be added.

Never connect the supply power to the VFD output terminals U, V and
W. Power line voltage applied to the output can result in permanent
damage to the VFD.
If frequent shifting is required, employ mechanically connected switches or contactors to
ensure that the motor terminals are not connected to the AC power line and VFD output
terminals simultaneously.