29
5Connectingtopowersupply
MINITRAC 31 • Foundation Fieldbus
41782-EN-211203
567
8
2
3
4
1
2
+
( )
(-)
1
Fig. 18: Adjustment and connection compartment (Ex-ia) with instruments with
intrinsically safe signal output
1 Terminals for intrinsically safe signal output FF bus
2 Contact pins for the display and adjustment module or interface adapter
3 Terminals for the external display and adjustment unit
4 Ground terminal
Ifinductiveloadsorstrongercurrentsareswitchedthrough,thegold
platingontherelaycontactsurfacewillbepermanentlydamaged.
Thecontactisthennolongersuitableforswitchinglow-voltage
circuits.
Inductive loads also result from the connection to a PLC input or
outputand/orincombinationwithlongcables.Itisimperativethatyou
take measures to extinguish sparks to protect the relay contact (e.g. Z
diode)orthetransistoror8/16mAoutput.
Adjustment and connec-
tion compartment - In-
struments with intrinsi-
cally safe signal output
Connection to a PLC