Position Controllers Subjected To Fast Acceleration Or Strong Vibration; Introduction Locking The Setting - Siemens SIPART PS2 Operating Instructions Manual

Procedure
1. Install the casing such that rain water or condensate running along the pipes can be drained
2. Check the seals of electrical connections for perfect fitting.
3. Check the seal in the enclosure cover for damage and contaminations. Clean and/or replace
4. Install the positioner such that the sintered bronze attenuator at the bottom side of the
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
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
5. Ensure that the plastic hose does not have any kinks and the exhaust air flows out without
4.5

Position controllers subjected to fast acceleration or strong vibration

4.5.1

Introduction locking the setting

The electropneumatic positioner has an gear latch for the friction clutch and for the
transmission ratio selector.
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 cause the friction
clutch to move in extreme cases.
The positioner is equipped with an gear latch for the friction clutch to counter these extreme
cases. The setting of the transmission ratio selector can also be locked.
The locking procedure is illustrated and described below.
Note
Use of external NCS sensor / internal NCS module
If you use the accessory part "NCS sensor for contactless position measurement" or a built-in
internal NCS module, the locking and fixing measures described in this section are not
necessary.
SIPART PS2 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00127926-AB
4.5 Position controllers subjected to fast acceleration or strong vibration
before the terminal strip of the positioner.
if required.
enclosure points downwards in the vertical mounting position. If this is not possible, replace
the attenuator with a suitable gland with a plastic hose.
the enclosure.
downwards.
any hindrance.
Installing/mounting
51