Cable Cross-Sections And Cable End Sleeves; Switching Of Inductive Loads - ProMinent DULCOMARIN 3 Compact Assembly And Operating Instructions Manual

6.3.5 Cable Cross-Sections and Cable End Sleeves

Without cable end sleeve 0.25 mm
Cable end sleeve without
insulation
Cable end sleeve with
insulation

6.3.6 Switching of inductive loads

Minimum cross-section
2
0.20 mm 2
0.20 mm 2
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 primarily used to protect switching con‐
tacts.
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 protective circuit is
highly suitable for AC voltage supplies.
The magnitude of the resistance R of the RC member is deter‐
mined according to the following equation:
R=U/I
L
(Where U= Voltage across the load and I
load)
The magnitude of the capacitor is determined using the following
equation:
C=k * I
L
k=0,1...2 (dependent on the application).
Only use capacitors of class X2.
Units: R = Ohm; U = Volt; I
Maximum cross-section
1.5 mm 2
1.0 mm 2
1.0 mm 2
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 protec‐
tive circuit. If in doubt, consult an electrical techni‐
cian for advice.
= Ampere; C = µF
L
If consumers are connected which have a high
starting current (e.g. plug-in, switched mains power
supplies), then a means of limiting the starting cur‐
rent must be provided.
Assembly and installation
Stripped insulation length
8 - 9 mm
10 - 11 mm
= current through the
L
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