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Installation
4.5 Notes for using positioners that are exposed to strong accelerations or vibrations
Procedure for installing the plastic hose on the gland
1. Unscrew the sintered bronze attenuator from the exhaust air opening at the bottom side
of the enclosure.
2. Screw in the aforementioned gland into the exhaust air opening.
3. Install the aforementioned plastic hose into the gland and check whether it fits firmly.
4. Fasten the plastic hose with a cable tie onto the control valve such that the opening
points downwards.
5. Ensure that the plastic hose does not have any kinks and the exhaust air flows out
without any hindrance.
4.5
Notes for using positioners that are exposed to strong accelerations or
vibrations
The electropneumatic positioner has a friction clutch and a switchable gear. The positioner
can therefore be universally used on part-turn and linear actuators. As a result, you need not
follow the zero point in case of part-turn actuators and a symmetrical mounting in case of
linear actuators. The working area can be set later using the friction clutch.
The switchable gear also allows you to adjust the positioner to small or large strokes.
Strong acceleration forces act on control valves that are subjected to heavy mechanical
loads, e.g. breakaway valves, strongly shaking or vibrating valves, as well as in case of
"vapor shocks". These forces may be much higher than the specified data. This may move
the friction clutch in extreme cases.
The positioner is equipped with an arrester device for the friction clutch in order to counter
these extreme cases. The setting of the transmission ratio selector can also be arrested.
This prevents a displacement due to extreme accelerations or strong vibrations.
These setting options are marked using additional signs and symbols.
Friction clutch
50
Arrester device
Transmission ratio selector
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
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