> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/cg1018-relay-box-installation-manual/installation/hardware-configuration/ps-and-nps-modes.md).

# PS and NPS modes

In PS and NPS modes the CG1018 operates as a B3 controlled 3 channel power supply. 

PS and NPS modes have the same output polarity. The only difference between them is the logic state which represents alarm not active (0) or active (1) that enables the output voltage.

For PS mode the output voltage is present when the controlling logic state is 1 (alarm active).

For NPS the output voltage is present when the controlling logic state is 0 (alarm not active).

More details about the NPS can be found in [Invert channels/outputs](/cg1018-relay-box-installation-manual/installation/config-file/practical_examples/invert_channelsoutputs.md).

{% hint style="info" %}
The power supply voltage provided by CG1018 in PS and NPS modes with the standard power supply is equal to about +24V despite the fact it is marked as +12V in the schematics and on the PCB.

When a non-standard power supply is used, the voltage is roughly equal to the voltage delivered by this non-standard power supply as described in [PS and NPS modes parameters](/cg1018-relay-box-installation-manual/installation/hardware-configuration/ps-and-nps-modes/ps-and-nps-modes-parameters.md#parameters-with-non-standard-power-supply).
{% endhint %}

The following chapters describe the PS and NPS settings and parameters in details.


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