Adjusting The Limit Switch - Samson 3730-2 Mounting And Operating Instructions

Adjusting the limit switch

9 Adjusting the limit switch
The positioner version with an inductive limit
switch has an adjustable tag (1) mounted on
the axis of rotation, which operates the prox-
imity switch (3).
For operation of the inductive limit switch,
the corresponding switching amplifier (see
section 5.2.1) must be connected to the out-
put circuit.
When the tag (1) is located in the inductive
field of the switch, the switch assumes a high
resistance. When it moves outside the field,
the switch assumes a low resistance.
Normally, the limit switch is adjusted in such
a way that it will provide a signal in both
end positions of the valve. The switch, how-
Adjustment screw (2)
Fig. 24: Adjusting the limit switch
80
ever, can also be adjusted to indicate inter-
mediate valve positions.
The required switching function, i.e. whether
the output relay is to be picked up or re-
leased when the tag enters the field, must be
selected at the switching amplifier, if re-
quired.
Note:

The inductive limit switch replaces the
software limit switch A1 with terminal
assignment +41/–42.
Each switching position can option-
ally be set to indicate when the tag
has entered the field, or when it has
left the field.
The second software limit switch re-
mains effective, the function of the
software limit switch A1 is disabled.
Metal tag (1) Proximity switch (3)
EB 8384-2 EN