ABB REF 542plus Technical Reference Manual page 14

REF 542plus REF 542plus
14
Multifunction Protection and Switchbay Control
Unit
Technical Reference Manual
Analog Output Board
Analog Input Module
0/4...20mA
Analog Input Board
IL1 IL1
DSP
IL2 IL2
IL3 IL3
UL1 UL1
Protection,
UL2 UL2
measurement,
UL3 UL3
Io Io
Vo
Main Board
Fig. 3.-4 REF 542plus block diagram
The HMI control unit, as shown in Fig. 3.-5, features a back-illuminated liquid
crystal display (LCD), eight push buttons, several LEDs and an electronic key
interface. The language of the display can be selected by using the related
configuration software tool, which is also used to define the protection and the
control scheme.
Fig. 3.-5 HMI control unit
The left side of the LCD display is reserved for the single line diagram. The right
side is for plain text visualization such as measurement and protection events. The
LCD backlight is switched off automatically after 20 minutes of inactivity.
The HMI is a complete system for the local management of the switchgear. The
HMI allows the operator to set the protection functions, operate the primary objects,
visualize measurements and events, reset alarms and change the unit working mode.
The HMI includes:
Communication board
0/4...20mA
Communication Processor Communication Processor
start L1
start L2
start L3
Release/Trip
Autoreclosure
CAN Eth.
Binary
inputs
Binary Input Output Board(s)
1MRS755859
RX RX TX TX
CP CP
µC
Control
Binary
outputs
A050397
A050399