Positioners Subjected To Fast Acceleration Or Strong Vibration - Siemens 6DR50 Series Operating Instructions Manual

Procedure
1. Install the casing such that rain water or condensate running along the pipes can be
drained before the terminal strip of the positioner.
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 if required.
4. Install the positioner such that the sintered bronze attenuator at the bottom side of the
enclosure points downwards in the vertical mounting position. If this is not possible,
replace the attenuator with a suitable gland with a plastic hose.
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

Positioners subjected to fast acceleration or strong vibration

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. Using the accessory
"NCS sensor for non contact position detection", it is possible to mount the controller unit a
certain distance away, e.g. on a mounting pipe or similar.
The locking procedure is illustrated and described below.
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12
4.5 Positioners subjected to fast acceleration or strong vibration
Installing/mounting
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