PQube User Manual 2.1
Page 19 of 113
Ethernet network using a standard Ethernet cable. For information on configuring your ETH1
module see Setting up Your Optional ETH1 Ethernet Module (page 32).
Installing Your PS1 or PS2 Power Supply Module
The optional PS1 or PS2 Power Supply Module connects to the right side of
your PQube; just snap it in. It accepts any 50/60 Hz single-phase input
between 100Vac and 240Vac nominal. Verify that you are connecting the
line and neutral wires to the correct terminals on the module. The PS1 and
PS2 Power Supply modules contain an internal fuse.
Installing Current Modules
If you want to measure current with your PQube you can install an optional module. Simply plug
the module into the side of your PQube.
PQube current modules provide transformer-based electrical isolation, except for the XCT5-0.333V,
XCT5-01V, XCT5-05V, and XCT5-10V, which take low-voltage inputs.
Note that your PQube makes current measurements with a Crest Factor of 3.5. This means that
your PQube can measure instantaneous currents up to 350% of the nominal rated current (for
example, if you have selected a 300-amp current transformer with a 5-amp secondary, your PQube
will accurately measure up to ±1050 amps instantaneous). This is a very useful feature when
dealing with inrush currents, and currents with high harmonic contents.
When connecting a Current Module, it is important to match the phases to the voltage inputs and
current input (connect the L1 voltage input and the L1 current sensor to the same conductor). This
is important for correct power and energy calculations.
There are three main types of current module, the XCT4 with current inputs, the XCT5 with voltage
inputs, and the CT4. You only need one current module to measure current, power, and energy.
Pick the version that works best for you.
XCT4 Current Module – Current inputs
You can connect external current transformers to your PQube. There
are two versions of the XCT4 module: each will work with a different
type of CT. Make sure you carefully read all safety information
provided by the manufacturer before installing CTs.
If you are using a CT with a current secondary, you can use the XCT4-
1A-00 or the XCT4-5A-00 which have 1 and 5 Amp inputs, respectively.
Your PQube places almost zero burden on the current transformer
(less than 0.1 VA), so you can select almost any current transformer.
XCT5 Current Module – Voltage inputs
If you are using a current sensor that has a voltage output, you can choose between the XCT5-
0.333V-00, XCT5-01V-00, XCT5-05V-00, and XCT5-10V-00 which have 0.333, 1, 5, and 10 Volt
inputs, respectively.
You can use either standard current transformers, or split-core current transformers. Standard
current transformers are generally less expensive, and are often more accurate. Split-core
transformers are much easier to install.
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