REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04
REF542
plus
: Installation and Commissioning
23 / 80
Figure 5:
Grounding of the REF542
plus
HMI Local Control Unit
4.2.6 Typical examples of analog and binary connections
The following pages show examples for wiring analog inputs (measuring inputs) on
the REF542
plus
with sensors or transducers, binary I/Os and analog output boards.
Typical examples of usage in practice will be shown here. The following symbols are
used in the circuit diagrams:
Table 10:
Graphical symbols for electric diagram (IEC 60617)
Symbol
Legend
Symbol
Legend
Energy flow from the bus bar
Ring core current transformer
Energy flow towards the bus
bar
Make contact
Mechanical, pneumatic or hy-
draulic connection (link)
Break contact
Earth, ground
Change-over break before
make contact
Conductors in a screened ca-
ble
Position switch, break contact
Twisted conductors
Circuit breaker
Connection of conductors
Disconnector
Plug and socket male and
female)
Operating device
