PQube User Manual 2.1
Page 14 of 113
IMPORTANT: Your PQube must be installed only by an expert for electrical installations
. The
instrument power screw terminals must be connected to no more than 24Vac +/- 20%, or
24Vdc~48Vdc +/- 20%, supplied by a certified isolating power supply.
PQube instrument power
Your PQube can take its operating power from three different sources: its Power screw terminals
[23][31], its internal Lithium Polymer rechargeable battery, or an optional PS1 Power Supply
module.
Power screw terminals
Your PQube’s Power screw terminals [23][31] accept 24VAC nominal, or 24Vdc~48Vdc nominal.
They are most commonly connected to 24Vdc, 24VAC, or -48Vdc.
Polarity does not matter. Also, your PQube provides a minimum of 150V of transformer-based
isolation between these terminals and all other terminals, eliminating any problems with ground
loops.
Internal Li-Polymer battery
Your PQube’s internal Li-Polymer battery is automatically charged from all the other power
sources. An application-specific chip manages the charging process, paying attention to voltage,
current, and temperature. The battery itself is equipped with an internal high-temperature shut-
down circuit.
The battery operating capability depends on the options installed in your PQube, and on the
ambient temperature. In typical tests, the battery can operate your PQube for about one hour.
However, you can choose the operating duration by writing a value in your Setup.ini file. The value
can be set from 1 to 9 minutes (the default is 3 minutes). This guarantees that there will be enough
charge in the battery to record several successive power interruptions.
As the battery ages, its capacity will decline. For maximum performance, it may be necessary to
replace the battery in 5 years. Some normal swelling of the battery may result from high
temperature operation, but this does not interfere with battery performance.
Connecting the wires
Observe the wire size specifications and limitations. All conductors must be stranded copper. All
conductors and insulation systems and crimped devices must be appropriate for the application.
PSL recommends crimped ferrules on stranded wire, or crimped snap-on forked lugs. Tighten the
screw terminals to 0,8 newton-meters (7 inch-pounds) of torque. Observe all voltage ratings and
limits.
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