Burkert Type 8025 User Manual
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Installation and wiring
Type 8025 UNIVERSAL
Insert▶the▶supplied▶stopper▶gaskets▶into▶the▶unused▶cable▶
glands▶of▶a▶wall-mounted▶version▶to▶ensure▶the▶tightness▶of▶
the▶device.
Only▶move▶the▶selectors▶when▶the▶power▶supply▶is▶off.
•▶ Use▶a▶filtered▶and▶regulated▶12-36▶V▶DC▶power▶supply.
•▶ Make▶sure▶the▶installation▶is▶equipotential.▶See▶chap.▶
•▶ Use▶shielded▶cables▶with▶a▶temperature▶limit▶of▶80▶°C▶
minimum.
•▶ Do▶not▶install▶the▶cables▶near▶high▶voltage▶or▶high▶fre-
quency▶cables;▶If▶this▶cannot▶be▶avoided,▶observe▶a▶min.▶
distance▶of▶30▶cm.
•▶ Protect▶the▶device▶power▶supply▶by▶means▶of▶a▶300▶mA▶
fuse▶and▶a▶switch.
•▶ Protect▶the▶power▶supply▶of▶each▶transistor▶output▶by▶
means▶of▶a▶125▶mA▶fuse.
•▶ Protect▶the▶relays▶by▶means▶of▶a▶max.▶3▶A▶fuse▶and▶a▶
circuit▶breaker▶(depending▶on▶the▶process).
•▶ Do▶not▶apply▶both▶a▶dangerous▶voltage▶and▶a▶safety▶extra-
low▶voltage▶to▶the▶relays.
7.4.1 Equipotentiality of the installation
To▶ensure▶the▶equipotentiality▶of▶the▶installation▶(power▶supply▶-▶
device▶-▶fluid):
▶
→
Connect▶together▶the▶various▶earth▶spots▶in▶the▶installation▶to▶
eliminate▶the▶potential▶differences▶that▶may▶occur▶between▶dif-
ferent▶earthes.
▶
→
Observe▶faultless▶earthing▶of▶the▶shield▶of▶the▶power▶supply▶
cable,▶at▶both▶ends.
▶
→
Connect▶the▶negative▶power▶supply▶terminal▶to▶the▶earth▶to▶sup-
press▶the▶effects▶of▶common▶mode▶currents.▶If▶this▶connection▶
cannot▶be▶made▶directly,▶a▶100▶nF/50▶V▶capacitor▶can▶be▶fitted▶
between▶the▶negative▶power▶supply▶terminal▶and▶the▶earth.▶
▶
→
Special▶attention▶has▶to▶be▶paid▶if▶the▶device▶is▶installed▶on▶
plastic▶pipes▶because▶there▶is▶no▶direct▶earthing▶possible.▶
Proper▶earthing▶is▶performed▶by▶earthing▶together▶the▶metallic▶
instruments▶such▶as▶pumps▶or▶valves,▶that▶are▶as▶close▶as▶pos-
sible▶to▶the▶device.▶If▶no▶such▶instrument▶is▶near▶the▶device,▶
insert▶metallic▶earth▶rings▶inside▶the▶plastic▶pipes▶upstream▶and▶
downstream▶the▶device▶and▶connect▶these▶parts▶to▶the▶same▶
earth.▶The▶earthing▶rings▶must▶be▶in▶contact▶with▶the▶fluid.
English