Kruger Ecowatt Drive K120 Series, Operation Manual

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Ecowatt ® Drive K120 series Installation guidelines
-21-
U-shaped tag between 24V and PW
Figure 3-9 Position of U-type short connector
If input signal comes from NPN transistors, set the U-type short connector based on the
power used according to the following figure.
S1
S2
COM
PW
+
24V
COM
+
24V
Internal power
（
NPN mode
）
S1
S2
COM
PW
+
24V
COM
+
24V
External power
（
NPN mode
）
+
24V
Figure 3-10 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.
S1
S2
COM
PW
+
24V
COM
+
24V
External power
（
PNP mode
）
S1
S2
COM
PW
+
24V
COM
+
24V
Internal power
（
PNP mode
）
Figure 3-11 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.