Samson 4763, Инструкция по монтажу и эксплуатации

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5-10 EB 8359-2 EN
Installation
Zul. Supply Alim.
5
[%]
Xp
4
3
2
1
0
0 90° 180° 270° 360°
1,4 bar 3 bar 6 bar
90°
180°
270°
0°
Fig. 5-10: Setting the Xp restriction
If the pointer has been removed by mistake,
a basic calibration can be performed as fol-
lows:
1. Close the restriction until slight resistance
can be felt.
2. From this position, open the restriction
one ¼ turn.
3. Push on the plastic ring with pointer
pointing to the 0° position.
4. Set the restriction in the range between
90° and 180°.
5. Set Xp as described above.
5.6.2 Zero and span
a) Actuator with "stem extends"
fail-safe action
To ensure that the total closing force of the
actuator acts on the valve, proceed as fol-
lows while adjusting the set point:
Î
With operating direction increasing/in -
creasing <<: adjust starting point to
4.5 mA (slightly raised).
Î
With operating direction increasing/de -
creasing <>: adjust starting point to
19.5 mA (slightly lowered).
Starting point (zero) e.g. 4.5 mA
1. Turn the zero adjustment screw (4) until
the plug stem just starts to move out of its
resting position (observe travel indica-
tor).
2. Reduce the input signal to 0 mA and
slowly increase it again. Check whether
the plug stem starts to move at exactly
4.5 mA and correct, if necessary.
Upper range value (span) e.g. 20 mA
3. Once the starting point has been set, in-
crease the input signal. At exactly
20 mA, the plug stem must stand still,
having moved through 100 % travel
(watch the travel indicator at the valve).
If the upper range value is incorrect,
move the pin (2 in
Fig. 5-6 or 2 in
Fig. 5-7 ) as follows to correct it:
4. Move towards
Lever end

To increase the travel
Fulcrum

To reduce the travel
After correcting the input signal, re-ad-
just zero. Then check the upper range
value again.
Repeat the correction procedure until both
values are correct.