Installation guide

www.weidmueller.com
1. Introduction
1.1 General description
Transclinic Xi+ modules provide very detailed monitoring, at the string box, of all the main plant variables,
like string current, voltage and temperature. The current of each string is only one of the principle measures
of the health of a photovoltaic power station; So all Transclinics also allow measurement of the voltage of the
group of strings, the temperature of the equipment and the state of the surge protection, fuses and so on by
means of two analogue inputs and two binary digital inputs. The two analogue signal inputs can be used to
measure almost any variable around the plant. An alarm output is also provided in the form of a solid state
relay.
All data is available via an industry standard RS485 Modbus RTU interface for connection to PV Power plant
SCADA systems or Weidmuller’s Softclinic PV plant monitoring software.
String current measurements are made using precision shunts, which guarantee perfect linearity, greater ac-
curacy and, importantly, measurements that are stable in the long term and free of the drift problems associ-
ated with Hall-effect sensors. Designed for mounting in string combiner boxes, the design combines string
currents on-board simplifying the array wiring.
When integrated into your string boxes the system allows a more proactive maintenance by detecting irregu-
larities in electricity generation that normally go un-noticed but decrease the global yield of your investment.
These devices also speed the traditional maintenance of the installation and lower the price of ownership by
immediately alerting your service team to fused/blown surge protection fuses, disconnected cables, poorly
performing panels, and even overheating in the string boxes.
The Transclinic 4xi, 7xi, 8xi and 14xi models can take measurements from 4, 7, 8 or 14 input strings simulta-
neously, with a maximum input current of 20A or 30A (according to the model). This equipment can work in
ambient temperatures from -20ºC to 70ºC.