Samson 3761, Mounting And Operating Instructions

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5 Adjusting the limit switch
Versions equipped with a limit switch can is-
sue signals to indicate the travel end posi-
tions.
The rotary motion of the closure member is
transmitted to the limit switch over the actua-
tor, positioner shaft and cam disc (1).
The limit switch can be adjusted to issue a
signal when the valve has reached either of
its end positions, i.e. OPEN or CLOSED po-
sition.
Adjusting the switching point:
Adjust the starting point and upper range
value before adjusting the limit switch.
1. Adjust the reference variable so that the
valve moves to the desired end position
where the switching function is to be ac-
tivated.
2. Loosen screw (3) and turn plate (2) so
that the roll (4) of the limit switch (5) trig-
gers the switching contact at the respec-
tive cam (1.1) of the cam disc.
3. Tighten screw (3) and check switching
point again.
20
EB 8386 EN
Adjusting the limit switch
1
1.1
2
3
4
5
41
41
42
43
42
43
A
I
N
Fig. 9 · Limit switch activation using the cam disc
1 Cam disc
1.1 Switching cams
2
Plate
3 Screw
4 Roll
5 Limit switch
Switching contact