Assembly and Installation
FLOWSIC100 Flare · Operating Instructions · 8013344/11L2/V 2-5/2018-10 · © SICK Engineering GmbH 149
Subject to change without notice
3.8.8 Connection of external pressure and temperature transmitters
External pressure and temperature transmitters can be connected to the MCUP control
unit with loop powering by the MCUP (active transmitters) or external powering (passive
transmitters). Default setting of the MCUP is loop powering (wiring diagram (
→
pg. 264,
Fig. 193).
Connection
– Loop powering by the MCUP
Use the internal MCUP backplane PELV power supply, terminals 29 (marked "+24Vdc)"
and 30 (marked "gnd"); alternative terminals 46 (marked "+24V") and 47 (marked
"gnd"); terminals 43-44 in 19“ MCUP.
–External powering
Use an external power supply specified according to Class2/SELV or PELV; connection
according to
p. 265, Fig. 194; for installations using the MCUP for zone 1 see wiring
diagrams p. 250, Fig. 179 to p. 229, Fig. 167).
3.8.9 Connection of relay contacts
All relay contacts must be used in circuits powered by a Class2/SELV or PELV specified
power supply only. Two possibilities exist:
– Using the internal MCUP backplane PELV power supply
Connections:
Terminals 46 (marked "+24V") and 47(marked "GND") on the MCUP processor board
The additional input wattage caused by additional devices connected to the relay con-
tacts must not exceed 10W.
– Using an external power supply specified according to Class2/SELV or PELV.
NOTICE:
The analog inputs are damaged by incorrect connection (
→
pg. 142, § 3.8.7.1,
Fig. 73)
NOTICE:
● For MCUP powering the relay contact circuits are connected to earth, which
means galvanic isolation is not available.
● Use an external Class2/SELV specified power supply to fulfill isolation from
earthing.
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