Instructions For Using Positioners Which Are Exposed To Great Accelerations Or Vibrations - Siemens PROFIBUS PA SIPART PS2 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
Procedure
44
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.
Fittings under heavy mechanical stresses such as from breakaway
flaps, violently shaking or vibrating valves, or steam jets can be
exposed to strong acceleration forces far above those specified. This
can result, in extreme cases, to a shifting of the friction clutch.
For such cases the position controller equipped with a fixing device for
the slip clutch with which adjustment due to the above mentioned
influences can be prevented. The setting possibility is accessible below
the black knurled wheel and is recognizable from slots on the yellow
wheel. The zero point adjustment and the setting possibility of the slip
clutch are identified by symbols on an additional plate (see figure 3-6,
page 45).
After you have mounted the position controller and commissioned it
completely, you can set the slip clutch torque as follows:
Plug a conventional 4 mm wide screwdriver into a slot in the yellow
S
wheel.
Then turn the yellow wheel to the left with the screwdriver until it
S
snaps in audibly. This increases the torque of the slip clutch.
A fixed slip clutch is recognizable from an approx. 1 mm wide gap
S
between the yellow and black wheel.
If you have to make a zero point setting, e.g. after changing the
S
drive, please reduce the torque first by turning the yellow wheel to
the right stop. After the zero point setting, you can fix the slip clutch
as described above.
SIPART PS2 PA Manual
A5E00127926-03