Changing The Operating Direction - Samson 3767 Mounting And Operating Instructions

2. Turn the zero adjuster (6.2) until the
valve just starts to move from its initial
position.
3. Increase the input signal and slowly re-
duce it again to 20 mA. Check whether
the valve starts to move at exactly
20 mA.
4. Correct any deviation at the zero adjust-
er (6.2). Turning the adjuster counter-
clockwise causes the valve to move from
its end position earlier; turning clockwise
causes the valve to move from its end po-
sition later.
Upper range value (span) e.g. 4 mA
1. Once the starting point has been set, in-
crease the input signal to 4 mA at the
ammeter. At exactly 4 mA, the plug stem
must stand still, having moved through
100 % travel (watch the travel indicator
at the valve).
2. If the upper range value is incorrect, turn
the span adjuster (travel). Four turns cor-
respond to a travel change of 10 % in
standard operation. In split-range opera-
tion, this value is reduced by half.
Turn the adjuster clockwise to reduce the
travel and counterclockwise to increase
it.
3. After the correction has been completed,
set the input signal to 20 mA again.
4. Turn the zero adjuster (6.2) again until
the pressure gauge indicates the re-
quired signal pressure (see section
4.1.2).
EB 8355-2 EN
NOTICE
After mounting and tuning the posi-
tioner, make sure that the vent plug of
the housing cover faces downward
when the valve is installed.
5.2 Changing the operating di-
rection
If the operating direction of directly attached
positioners (Fig. 3) is to be changed after
they have been installed, turn the turnboard
(7) and change the position of the connec-
tion block, positioner and clamp (1.2).
For attachment according to IEC 60534-6
(NAMUR), turn the turnboard (7) and the
positioner on the adapter housing (Fig. 6).
In positioners for rotary actuators, reassign
the cam disk as shown in Fig. 9 and Fig. 10.
For details on changing the turnboard (7) re-
fer to section 3.
Operation
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