Samson TROVIS 3730-3, Mounting And Operating Instructions

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112 EB 8384-3 EN
Operating the positioner
7.8 Adjusting inductive limit switch
The positioner version with an inductive limit switch has an adjustable tag (1) mounted on the
axis of rotation, which operates the proximity switch (3).
For operation of the inductive limit switch, the corresponding switching amplifier (see sec -
tion 5.16.2) must be connected to the output circuit.
When the tag (1) is located in the inductive field of the switch, the switch assumes a high re
-
sistance. 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, however, can also be adjusted to indicate intermediate
valve positions.
The required switching function, i.e. whether the output relay is to be picked up or released
when the tag enters the field, must be selected at the switching amplifier, if required.
The inductive limit switch replaces the software limit switch A1 with terminal assignment
+41/–42.
Each switching position can optionally be set to indicate when the tag has entered the field
or when it has left the field.
The second software limit switch remains effective, the function of the software limit switch A1
is disabled.
Software adaptation
− Code 38 (inductive alarm is set to YES).
−
The inductive limit switch is connected to the ter41/–42 (see section 5.16).
− The device is set up accordingly in the delivered state.
Adjusting the switching point
During adjustment or testing, the switching point must always be approached from mid-posi-
tion (50 %).
To guarantee the switching under all ambient conditions, adjust the switching point approx.
5 % before the mechanical stop (OPEN – CLOSED).
Note
Note