Wiring Protection; Protect The Vfd And Input Power Cable In Short-Circuit; Protect The Motor And Motor Cable In Short Circuit; Protect Motor And Prevent Thermal Overload - INVT Goodrive350 Series Operation Manual

Goodrive350 series high-performance multifunction VFD
S1
S2
COM
PW
+ 24V
Internal power（PNP mode）

4.5 Wiring protection

4.5.1 Protect the VFD and input power cable in short-circuit

Protect the VFD and input power cable during short-circuit to avoid thermal overload.
Carry out protective measures according to the following requirements.
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.

4.5.2 Protect the motor and motor cable in short circuit

If the motor cable is selected based on rated VFD current, the VFD will be able to protect the motor
cable and motor during short circuit without other protective devices.
 If the VFD is connected to multiple motors, it is a must to 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.

4.5.3 Protect motor and prevent thermal overload

According to the requirements, the motor must be protected to prevent thermal overload. Once
overload is detected, you must cut off the current. The VFD is equipped with motor thermal overload
protection function, which will block output and cut off the current (if necessary) to protect the motor.
COM
+ 24V
Figure 4.21 PNP mode
Input cable
Fuse
Figure 4.22 Fuse configuration
S1
S2
COM
PW
+ 24V
External power（PNP mode）
VFD
M3 ~
-30-
Installation guide
COM
+ 24V