Cashco Siemens PS2 I/P - Manual (Page 28)

Design and Functional Principle
28
SIPART PS2 Manual
A5E00074631-01
2.5.2 Options modules in explosion proof version
The options modules are protected and mechanically fixed by a module
cover ((1), see figure 2-11, page 29).
.
NOTE
The housing must be opened to install the options modules. The
degree of protection IP65/NEMA4x is not guaranteed as long as the
positioner is open.
!
WARNING
The explosion proof positioner may only be supplied with electrical
power in areas in which the atmosphere may be potentially explosive
when the housing is closed.
The feed--though openings for the electronic connections must be
sealed with EEX-d certified cable glands or EEx-d certified plugs or an
ignition lock must be mounted at a maximum distance of 46 cm
(18 inches) when using the “conduit”--system.
Disconnect or isolate the power supply cables first.
To open the positioner, the safety catch (12) must be opened and the
screw--on cover unscrewed.
After loosening the four fixing screws (13.1) the complete rack (13) can
be removed. The actuator may have to be turned so that the clutch can
be easily disengaged.
Remove the module cover (1). To do this, the two screws (1.1) must be
removed with a screwdriver.
.
NOTE
To prevent premature wearing of the fixture by the self--tapping screw
(1.1) next to the display, the following method of mounting the module
cover (1) has proven effective.
1. Turn the screws counterclockwise until you feel them snap into the
thread.
2. Tighten both screws carefully in clockwise direction.
Open the positio-
ner