> 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/ps-and-nps-modes-parameters.md).

# PS and NPS modes parameters

## Parameters with standard power supply

The parameters with a standard 24V, 1.5A power supply are as follows:

<table><thead><tr><th width="252">Parameter</th><th width="92">Value</th><th>Comment</th></tr></thead><tbody><tr><td>Output voltage</td><td>24V-Vd</td><td>The voltage on the output will be about 0.5V lower than the power supply output voltage. The voltage drop Vd depends on the current and is caused by the voltage drop on power supply input protecting elements F20 and D21, shown on the schematic below.</td></tr><tr><td>Max output current per channel</td><td>1A </td><td>Relay limit.</td></tr><tr><td>Max total output current for all 3 channels</td><td>1.25A</td><td>The unit itself may need up to 250mA.</td></tr><tr><td>Isolation</td><td></td><td>If the output channels are set as power output, then they are NOT isolated and are all electrically connected to the power supply.</td></tr><tr><td>Protection</td><td></td><td>The power supply input is equipped with PolySwitch® Resettable PPTC with 2A hold current and 3.5A trip current, 44V overvoltage protection and opposite polarity protection.</td></tr></tbody></table>

## Parameters with non standard power supply

CG1018 can be supplied with **10 to 36V DC** power supply.&#x20;

If the power supply delivers Vout volts and maximum Imax amps then the parameters with such a non standard power supply are as follows:

<table><thead><tr><th width="239">Parameter</th><th width="96">Value</th><th>Comment</th></tr></thead><tbody><tr><td>Output voltage</td><td>Vout-Vd</td><td>The voltage on the output will be about 0.5V lower than the power supply output voltage. The voltage drop Vd depends on the current and is caused by the voltage drop on power supply input protecting elements F20 and D21, shown on the schematic below.</td></tr><tr><td>Max output current per channel</td><td>1A </td><td>Relay limit.</td></tr><tr><td>Max total output current for all 3 channels</td><td>2A</td><td>Under the condition the max current per channel is no more than 1A. The limit is defined by F20 polyswitch.</td></tr><tr><td>Imax</td><td></td><td>250mA for the unit itself plus the sum of currents for all three channels.</td></tr><tr><td>Isolation</td><td></td><td>If the output channels are set as power output, then they are NOT isolated and are all electrically connected to the power supply.</td></tr><tr><td>Protection</td><td></td><td>The power supply input is equipped with PolySwitch® Resettable PPTC with 2A hold current and 3.5A trip current, 44V overvoltage protection and opposite polarity protection.</td></tr></tbody></table>

<figure><img src="https://1683511357-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FV2iO5pWD0jTdNo3roKtG%2Fuploads%2FIz7bPoykfti5wI0Mhd16%2Fimage.png?alt=media&amp;token=320e3ea9-333b-4ef0-a889-2cfad4c05011" alt=""><figcaption><p>Power supply input protection</p></figcaption></figure>


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