Siemens SIPART PS2 6DR52xx - Manual (Page 44)

Preparing for Operation
44
SIPART PS2 Manual
A5E00074631--06
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NOTE
The positioner will be equipped at the factory and delivered complete
with the necessary options at the customer’s request. Options modules
may only be retrofitted by our service technicians.
The positioner must be assembled – especially in a moist environment
– in such a way as to rule out freezing of the positioner axle at low
ambient temperature.
The operating keys must be covered to prevent liquid getting in.
!
WARNING
In the combination of components it must be ensured that only
positioners and options modules are combined which are approved
for the respective area of application. This applies especially for safe
operation of the positioner in areas in which the atmosphere is poten-
tially explosive (zone 1 and 2). The instrument categories (2 and 3) of
the instrument itself and those of its options must be observed.
In addition, you must always make sure that no water gets into an open
housing or screw-type gland. This may be the case for example when
the positioner cannot be finally assembled and connected immediately.
It generally applies that the positioner may only be operated with dry
compressed air. Therefore use the normal water traps. An additional
drying unit may even be necessary in extreme cases. This is particu-
larly important when operating the positioner at low ambient tempera-
tures. Please set the purge air switch (on the valve block above the
pneumatic terminals) additionally to the “OUT” position.
Use a sufficiently rugged console (e.g. plate thickness > 4 mm with
reinforcements) for part-turn actuators and the mounting kit “linear
actuator” or integrated connection for linear actuators.
3.3.1 Instructions for using positioners in a wet environment
This information gives you important instructions for the assembly and
operation of the positioner in a wet environment (frequent, heavy rain
and/or prolonged tropical condensation) in which the IP66 degree of
protection is no longer sufficient and especially when there is a danger
that water may freeze.
To prevent water getting into the instrument in normal operation (e.g.
through the exhaust air openings) or the display being poorly legible,
please avoid the unfavorable installation positions illustrated in
figure 3-5.