Samson FOUNDATION 3730-5, Mounting And Operating Instructions

Page: 80 / 132

80 EB 8384-5 EN
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:
Note:
During adjustment or testing, the
switching point must always be ap
-
proached 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
Note:
The same requirements apply to ret -
rofitting an inductive limit switch as to
servicing the positioner. For explo-
sion-protected positioners, the re-
quirements in section 11(Servicing
explosion-protected devices) need to
be kept. Check the "Limit switch, in -
ductive" box on the nameplate after
installing the limit switch.
1. Take off the rotary pushbutton (3) and cap
(1), unthread the five fastening screws (2)
and lift off the plastic cover (9) together
with the display,
taking care not to dam -

