Siemens PROFIBUS PA SIPART PS2 Manual page 33

Opening the
instrument
.
J -module
y
Alarm module
SIA-module
SIPART PS2 PA Manual
A5E00127926-03
To open the positioner, the four screws of the housing cover must be
loosened with a Phillips screwdriver.
Disconnect or isolate the power supply cables.
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 screws
(1.1), 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
Insert the J -module (3) in bottom pcb rails of the container, establish
y
the electrical connection with the enclosed ribbon cable (6).
Insert the alarm module (4) in the top pcb rails of the container,
establish the electrical connection with the enclosed ribbon cable (5).
(Slot Initiator Alarm module) Proceed as follows for installation:
1. Remove all the electrical connections from the basic electronics
(2).
2. Loosen the two fixing screws (2.1) of the basic electronics.
3. Snap out the basic electronic board by carefully bending the four
holders.
4. Insert the SIA-module (7) from above up to the top pcb rail of the
container.
5. Push the SIA module in the pcb rail of the container about 3 mm to
the right.
6. Screw the special screw (7.1) through the SIA module into the axle
of the positioner (Torque: 2 Nm):
CAUTION
The pin pressed into the actuating disc bearing (11) must be adjusted
to just before touching with the special screw. The actuating disc bea-
ring and the special screw must then be turned simultaneously so that
the pins slot into the special screw.
Design and Functional Principle
31