Siemens SIPROTEC 4 7SJ61 Manual page 238

Mounting and Commissioning
3.1 Mounting and Connections
Work on the Plug Connectors
!
CAUTION
Mind electrostatic discharges
Non–observance can result in minor personal injury or material damage.
When working on plug connectors, electrostatic discharges must be avoided by previously touching a
²
grounded metal part.
Do not plug or withdraw interface connections under power!
²
Here, the following must be observed:
•
Disconnect the ribbon cable between the front cover and the A–CPU board (No. 1 in the following figure)
on the front cover side. Press the top latch of the plug connector up and the bottom latch down so that
the plug connector of the ribbon cable is pressed out.
•
Disconnect the ribbon cables between the A-CPU unit (No. 1) and the input/output printed circuit board
AI/ O (No. 2).
•
Remove the boards and set them on the grounded mat to protect them from ESD damage. In the case of
the device variant for panel surface mounting, please be aware of the fact that a certain amount of force
is required to remove the A-CPU board due to the existing plug connector.
•
Check the jumpers according to
may be change or remove them.
Board Arrangement
The arrangement of the printed circuit boards (PCBs) can be seen in the following figure.
[front-geh-eindrittrl-o-frontkap-7sj61-20121112, 1, en_US]
Figure 3-3
238
Figure 3-5
Front view of housing size 1
to Figure 3-7 and the following information, and as the case
/ after removal of the front cover (simplified and scaled down)
3
SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016