Samson 3730-4, Original Instructions Manual

Page: 81 / 128

EB 8384-4 EN 81
Adjusting the limit switch
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.
Adjusting the switching point:
During adjustment or testing, the switching
point must always be approached from
mid-position (50 %).
To guarantee the switching under all ambient
conditions, adjust the switching point ap-
prox. 5 % before the mechanical stop (OPEN
– CLOSED).
For CLOSED position:
1. Initialize the positioner.
2. Move the valve to 5 % in the MAN mode
(see display).
3. Adjust the tag at the yellow adjustment
screw (2) until the tag enters or leaves
the field and the switching amplifier re -
sponds.
You can measure the switching voltage
as an indicator.
Contact function:
−
Tag leaving the field > contact is closed.
− Tag entering the field > contact is
opened.
For OPEN position:
1. Initialize the positioner.
2. Move the valve to 95 % in the MAN
mode (see display).
3. Adjust the tag (1) at the yellow adjust-
ment screw (2) until the tag enters or
leaves the field of the proximity switch
(3).
You can measure the switching voltage
as an indicator.
Contact function:
− Tag leaving the field > contact is closed.
−
Tag entering the field > contact is
opened.
9.1 Retrofitting an inductive
limit switch
Required retrofit kit:
Limit switch Order no. 1400-7460
The same requirements apply to retrofitting
an inductive limit switch as to servicing the
positioner. For explosion-protected position
-
ers, the requirements in section 11 „Servic -
ing explosion-protected devices“ need to be
kept. Check the "Limit switch, inductive" box
on the nameplate after installing the limit
switch.
Note
Note