Step 5 PNP/NPN Mode Selection
The H2 inverter supports both PNP (Source) and NPN (Sink) modes for activating the digital inputs at
the terminal block. Select an appropriate mode to suit switching requirements using the PNP/NPN
selection switch (SW2) on the IO TB board. The following describes each mode along with connection
diagrams. Switch position (status) can be viewed at parameter IN-90.
NPN Mode (Sink)
This is the factory default setting of the inverter. With SW2 (on IO TB PCB) in the NPN position,
connect an external contact (switch, relay, transistor) between Px and CM. When the external contact
closes, the input is activated by connecting the internal 24V source to CM (sink). CM is the common
ground terminal for all digital input terminals.
PNP Mode (Source)
With SW2 (on the IO TB PCB) in the PNP position, the input is activated by applying 24V to the digital
input. Connect an external contact (switch, relay, transistor) between 24 and Px terminal. When the
contact closes, the input is activated by applying 24V to the digital input. The 24V source can be from
the inverter’s “24” terminal or an external supply. When using an external 24V source, connect the
external source (-) to the CM terminal. CM is the common ground terminal for all digital inputs.
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