INVT GD20-0R4G-2-UL, Руководство по эксплуатации

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Goodrive20-UL Series VFD Installation guidelines
-19-
If input signal comes from PNP transistors, set the U-shaped jumper based on the power used
according to the following figure.
S1
S2
COM
PW
+
24V
COM
+
24V
S1
S2
COM
PW
+
24V
COM
+
24V
Figure 3-10 PNP mode
3.3 Wiring protection
3.3.1 Protect the VFD and input power cable when a short circuit occurs
Protect the VFD and input power cable in short circuit situations and against thermal overload.
Arrange the protection according to the following guide.
Input cable
VFD
Fuse
Figure 3-11 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.
3.3.2 Protect 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.
3.3.3 Establish 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.