Goodrive600 series high-performance multifunction VFD
Installation
-43-
Input cable
VFD
M3 ~
Fuse
Figure 4-21 Fuse configuration
Note: Select the fuse according to the manual. In case of short circuit, the fuse protects input power cables to
avoid damage to the VFD; if internal short-circuit occurs to the VFD, it can protect neighboring equipment from
being damaged.
4.6.2 Protecting the motor and motor cable in case of short circuit
If the motor cable is selected based on VFD rated current, the VFD is able to protect the motor cable and motor during
short circuit without other protective devices.
If the VFD is connected to multiple motors, use a separated thermal overload switch or
breaker to protect the cable and motor, which may require the fuse to cut off the short
circuit current.
4.6.3 Protecting the motor against thermal overload
The motor must be protected against thermal overload. Once overload is detected, current must be cut off. The VFD is
equipped with the motor thermal overload protection function, which can block output and cut off the current (if necessary)
to protect the motor.
4.6.4 Bypass connection
In some critical scenarios, the power/variable frequency conversion circuit needs to be configured to ensure proper
operation of the system when a fault occurs to the VFD.
In some special scenarios, such as in soft startup, power-frequency running is directly performed after the startup, which
requires bypass connection.
Do not connect any power source to the VFD output terminals U, V, and W. The voltage
applied to the motor cable may cause permanent damage to the VFD.
If frequent switchover is needed, you can use the switch which carries mechanical interlock or a contactor to ensure
motor terminals are not connected to input power cables and VFD output ends simultaneously.
