PQube 3 Installation Manual
Manual#: 851-000135
Version 3.4 – 08/11/2022 Page 41 of 47
4.2 Initial Device Setup
Your PQube 3 will work right out of the box. Once your PQube 3 has been installed, connected to the
monitoring circuit, and powered on, it will begin recording data immediately. The default settings will
work for most applications. Note: For Delta Configuration (3 phases, no neutral).
4.2.1 Set Potential Transformer (PT) Ratio
If you monitor voltages above 960 Vac Phase-to-Phase (480 Vac Phase-to-Earth), you need to
interface to the secondary of a potential transformer (which steps down the voltage to a level
compatible with your PQube 3).
You then need to define the PT ratio in the configuration so that your PQube 3 reports the actual
primary voltage.
For example, to use your PQube 3 on a 24 kV distribution system, and use a secondary voltage of
240 Vac, you need to set a 100:1 PT ratio.
In the Configurator, set the PT ratio to 24000:240 or 100:1. You will also need to set your nominal
voltage using the primary voltage of your PT. Even though your PQube 3 has 240 Vac applied to its
mains AC voltage terminals, you need to set the nominal voltage to 24,000.
For the PQube 3v, ONLY the voltage settings are set as there are no current inputs.
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