Switching Of Inductive Loads - ProMinent DULCOMETER Assembly And Operating Instructions Manual

Assembly and installation
2. Slightly lift the top section of the housing forwards and plug the housing top section
in the park position in the housing bottom section.
3.
Large threaded connection (M 20 x 1.5)
Small threaded connection (M 12 x 1.5)
4. Guide the cable into the controller.
5. Connect the cable as indicated on the terminal diagram
6. Tighten the clamping nuts of the threaded connections so that they are properly
sealed
7. Place the upper section of the housing onto the lower section of the housing.
8. Manually tighten the housing screws
9. Check once again that the seal is properly fitted. The degree of protection IP 67
(wall/pipe-mounted) or IP 54 (control pane-mounted) can only be assured if the
mounting is correct.
6.3.5

Switching of inductive loads

If you connect an inductive load, i.e. a
consumer which uses a coil (e.g. an
alpha motorised pump), then you
must protect your controller with a
protective circuit. If in doubt, consult
an electrical technician for advice.
The RC member protective circuit is a
simple, but nevertheless very effective,
circuit. This circuit is also referred to as a
snubber or Boucherot member. It is pri‐
marily used to protect switching contacts.
44
When switching off, the connection in
series of a resistor and capacitor means
that the current can be dissipated in a
damped oscillation.
Also when switching on, the resistor acts
as a current limiter for the capacitor
charging process. The RC member pro‐
tective circuit is highly suitable for AC
voltage supplies.