Goodrive18 series two-in-one VFD Installing
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3.2 Wiring protection
3.2.1 Protecting the VFD and input power cable in short circuit
In case of short circuit, the VFD and input power cable can be protected, preventing thermal
overload.
Take protective measures according to the following rule.
VFD
Fuse
3PH input cable
M1
M2
Figure 3.9 Fuse configuration diagram
Note: Select the fuse according to Appendix C.4 "Breaker and electromagnetic contactor". In
case of short circuit, the fuse protects the input power cable, preventing the VFD from being
damaged. When an internal short circuit occurred to the VFD, adjacent equipment is
prevented from being damaged.
3.2.2 Protecting the motor and motor cable
The VFD protects the motor and motor cable in a short- circuit situation if the motor cable is
selected according to the VFD rated current. The VFD provides the motor overload protection
function, which can protect the motor and block output and cut off current when necessary.
If the VFD is connected to multiple motors, an additional separate
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.
3.2.3 Bypass connection
In critical occasions, setting the power-variable frequency conversion circuit is necessary to
ensure proper running even when a VFD fault occurs. In some special scenarios, for example,
when only soft startup is needed, power-frequency running can be directly used after soft
startup, which requires bypass configuration.
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