Wiring Protection; Protecting The Vfd And Input Power Cable In Short Circuit - Kruger Ecowatt Drive K120 Series Operation Manual

Ecowatt ® Drive K120 series
If input signal comes from NPN transistors, set the U-type short connector based on the
power used according to the following figure.
Internal power（NPN mode）
If input signal comes from PNP transistors, set the U-type short connector based on the
power used according to the following figure.
Internal power（PNP mode）

3.3 Wiring protection

3.3.1 Protecting the VFD and input power cable in short circuit

The VFD and input power cable can be protected during short-circuit to avoid thermal
overload.
Carry out protective measures according to the following requirements.
Figure 3-9 Position of U-type short connector
S1
S2
COM
COM
+ 24V
PW
+ 24V
Figure 3-10 NPN mode
S1
S2
COM
COM
+ 24V
PW
+ 24V
Figure 3-11 PNP mode
U-shaped tag between 24V and PW
S1
S2
COM
+ 24V
PW
+ 24V
External power（NPN mode）
S1
S2
COM
PW
+ 24V
External power（PNP mode）
-21-
Installation guidelines
COM
+24V
COM
+ 24V