Sourcetronic ST600 - Wiring Protection; Protect the VFD and Input Power Cable in Short-Circuit

Frequency Inverter ST600 Series High-Performance Multifunction VFD Installation Guide
-38-
on the power used according to the figure below.
Figure 4-31 NPN mode
S1
S2
COM
PW
+
24V
COM
+ 24V
Internal power（NPN mode）
S1
S2
COM
PW
+ 24V
COM
+
24V
External power（NPN mode）
+ 24V
If input signal comes from PNP transistor, set the U-shaped jumper based on the power used
according to the figure below.
Figure 4-32 PNP mode
S1
S2
COM
PW
+ 24V
COM
+ 24V
External power（PNP mode）
S1
S2
COM
PW
+ 24V
COM
+ 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.
Figure 4-33 Fuse configuration (standard models)
Input cable
VFD
M3
~
Fuse