Control board REF542PLUS

REF 542plus is a Switchgear Multifunction Protection and Switchgear Control Unit
and it is the further development of the former REF 542 multifunctional unit. Like
its predecessor, it features the following functions:
* Protection
* Measurement
* Control
* Monitoring and self diagnosis
* Communication
All above-mentioned and also power quality functions are integrated into a
programmable environment. The exceptional flexibility and scalability of this new
generation device lead to a smart solution where the traditional approach would be
ineffective and expensive.
REF 542plus is composed of two parts: a base unit and a separate human machine
interface (HMI). The base unit contains the power supply, the processor board, the
analog input board and binary input and output (I/O) modules, as well as optional
modules for supplementary functions. The base unit and a HMI are connected with a
serial cable.
The HMI is a stand-alone unit with its own power supply. It can be installed on the
low voltage (LV) compartment door or in a dedicated compartment close to the
central unit. The HMI can be used to set the protection parameters to locally operate
the switching devices in the switchgear and to visualize events and measurements. A
shielded, isolated twisted pair according to the RS-485 standard interface connects
the HMI to the base unit.