Goodrive30 Series VFD Installation guidelines
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S1
S2
COM
PW
+ 24V
COM
+ 24V
External power（PNP mode）
S1
S2
COM
PW
+ 24V
COM
+ 24V
Internal power（PNP mode）
Figure 3-14 PNP mode
3.3 Wiring protection
3.3.1 Protecting the VFD and input power cable in short circuit
The VFD and input power cable can be protected during short-circuit to avoid thermal
overload.
Carry out protective measures according to the following requirements.
VFD
Fuse
Input cable(three phase)
Figure 3-15 Fuse configuration
Note: Select the fuse according to operation manual. During short-circuit, the fuse will protect
input power cables to avoid damage to the VFD; when internal short-circuit occurred to the
VFD, it can protect neighboring equipment from being damaged.
3.3.2 Protecting the motor and motor cable
If the motor cable is selected according to the rated current of the VFD, the VFD can perform
short-circuit protection for the motor and motor cable. The VFD provides the motor thermal
overload protection function, which can protect the motor, and lock the output and cut off the
current when necessary.
If the VFD is connected to multiple motors, an additional thermal overload
switch or breaker must be used to protect the motor and motor cable.
Such a device may use the fuse to cut off the short-circuit current.
3.3.3 Bypass connection
In critical occasions, power-variable frequency conversion circuit is necessary to ensure
proper operation of the system when VFD fault occurs. In some special cases, for example,
only soft startup is needed, it will convert to power-frequency operation directly after soft
startup, corresponding bypass link is also needed.
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