Current Transformer connection (6): inputs for the current transformers
connection. A different transformer will be required per electrical line being
monitored. The two wires of each transformer will be inserted into the two
connection points of the particular input channel to be used. For instance, if
three electrical lines are going to be monitored, one transformer will need to
be connected to the slots CT1 +/- (referred to as “Phase 1” in the Single-
Phase application program), another one to the slots CT12 +/- (“Phase 2”),
and a third one to the slots CT3 +/- (“Phase 3”). In the case of the Three-
Phase version, each transformer will be destined to monitor one of the three
phase lines in the electrical system.
To get detailed information about the technical features of the device, as well as on the
installation and security procedures, please refer to the corresponding Datasheet,
bundled with the original package of the device and also available at www.zennio.com.
1.2.1 CURRENT TRANSFORMER
The set-up process of the ZN1AC-CST60 and ZN1AC-CST120 transformers is
described below.
Open the top clamp of the transformer.
Put the wire of the phase to be measured inside it respecting the orientation.
Important: only one phase line should be inserted into the transformer, not
the entire power cable with the neutral and other phases.
Close back the top clamp of the transformer.
Connect the two wires of the transformer into the two connection slots of the
KES Plus terminal block (6).
Please remember that KES Plus only performs measurements of the power consumed
by alternating current (AC) lines.
Note: it is very important to keep in mind that neither ordinary power supplies (230 V)
nor other external supplies should be connected to the KNX bus, nor directly to the
input terminal probes of KES Plus.
