INVT Goodrive390L Series User Manual page 34

Goodrive390L Series Lift-Dedicated VFD
Power cable and VFD protection

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. The wiring diagram is shown in
Note: Select the fuse according to section
Motor and motor cable short-circuit protection

If the motor cable is selected based on VFD rated current, the VFD is able to protect the
motor cable and motor without other protective devices during short circuit.
Note: 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.
Motor thermal overload protection

Once overload is detected, the power supply 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.
Bypass connection protection

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.
If VFD status needs to be switched frequently, 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.
202403 (V1.0）
Figure 4-12 Fuse configuration
VFD
Input cable
Fuse
Figure 4-12.
M3 ~
E.2 Breaker and electromagnetic
Electrical installation
contactor.
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