Replacing The Processing Unit - Siemens SIPROCESS GA700 Operating Instructions Manual

11.6

Replacing the processing unit

Procedure
1. Isolate the device from power.
2. Remove the housing cover. To do so, unscrew the two nuts on the rear panel of the device and
push the housing cover to the back.
Figure 11-1
3. Loosen the two screws and remove the printed circuit board holder
4. Disconnect the following cables depending on the installation situation:
– Power cable
– 26-pin ribbon cable to display
– Ethernet cable
– 12-pin ribbon cable to analyzer modules (AM) and option module OM 2.2
– 50-pin ribbon cable to option module 1.1
5. Loosen the screws (outer, rear) and remove the processing unit (PU)
6. Install the new PU in the reverse order.
Tighten the screws on the rear panel with a torque of 1.3 Nm.
Tighten the screws of the FBG holder on the power supply, and the cap nuts on the housing
cover with a torque of 2.5 Nm.
Rack-mounted device
Operating Instructions, A5E31874006-12
①
Power cable
②
Ethernet cable
③
12-pin ribbon cable (CAN bus)
④
PU and screws
Connection cables for processing unit
①
②
11.6 Replacing the processing unit
⑤
26-pin ribbon cable (display)
⑥
Printed circuit board holder and screws
⑦
50-pin ribbon cable
⑤
⑦
Maintenance and service
⑥
.
③
④
.
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