Instructions For Using Positioners Which Are Exposed To Great Accelerations Or Vibrations - Siemens 6DR55 Series Manual

Preparing for operation
Assembly of the screw--type gland with plastic hose
3.3.2 Instructions for using positioners which are exposed to great
accelerations or vibrations
50
Unscrew the sinter bronze silencer from the exhaust air opening on
S
the underside of the housing.
Screw the screw--type gland mentioned above into the exhaust air
S
opening.
Mount the above mentioned plastic hose on the screw--type gland
S
and check the good fit.
Fix the plastic hose with a cable strap to the fitting so that the
S
opening faces downwards.
Make sure that the hose has no kinks and the exhaust air can flow
S
out unhindered.
NOTICE
for explosion proof versions:
Only adjust the outer friction clutch (8, Fig.17, page 36). The internal
friction clutch (8, Fig.16 page 33 ) is fixed and, for the explosion proof
version, must not be adjusted.
The electro--pneumatic positioner features a friction clutch and a swit-
chable drive and is, therefore, universally applicable for part--turn and
linear actuators. That's why it is not necessary to take a zero--point into
consideration when implementing part--turn actuators. Similarly, there is
no need to ensure that the extension is symmetrically attached when
implementing linear actuators. In both cases, the work space can be
adjusted afterwards via the friction clutch.
The switchable drive can be used to adjust the positioner for short or
long strokes.
Large accelerating forces can occur on fittings subject to heavy mecha-
nical wear and tear, such as openings which could break off, valves
subject to heavy vibrations as well as beating blast pipes. In some ca-
ses, these forces can far exceed the specifications. In extreme cases,
these forces could even cause the friction clutch to shift.
For these cases, the positioner is equipped with a position--securing
device for holding the friction clutch in place. Furthermore, it is also
possible to lock the transmission ratio selector into position, thus pre-
venting it from shifting due to the influences stated above.
Both setting options are designated accordingly by icons on additional
signs (see Fig. 25 page 51).
SIPART PS2 PA Manual
A5E00127926--05