Siemens siprotec SJ62 User Manual page 375

3 Mounting and Commissioning
Work on the Plug
Connectors
373
• Remove the four or six caps on the front cover and loosen the screws that become
accessible.
• Carefully take off the front cover. With device versions with a detached operator
panel it is possible to remove the front cover of the device right after having un-
screwed all screws.
Caution!
Mind electrostatic discharges
Non–observance can result in minor personal injury or material damage.
When handling with plug connectors, electrostatic discharges may emerge by previ-
ously touching an earthed metal surface must be avoided.
Do not plug or withdraw interface connections under power!
Here, the following must be observed:
• Disconnect the ribbon cable between the front cover and the CPU board (No. 1 in
Figures 3-3 and 3-8) at 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. This action does not apply to the device version with detached opera-
tor panel. However, on the central processor unit CPU (No. 1) the 7-pole plug con-
nector X16 behind the D-subminiture connector and the plug connector of the
ribbon cable (connected to the 68-pole plug connector on the rear side) must be re-
moved.
• Disconnect the ribbon cables between the CPU unit (No. 1) and the input/output
printed circuit boards I/O (No. 2), (No. 3) and (No. 4).
• 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 a certain amount of force is required in order to remove the CPU
board due to the existing plug connector.
• Check the jumpers according to figures 3-9 to 3-20 and the following information.
Change or remove the jumpers if necessary.
The arrangement of modules for device types and housing sizes are shown in Figures
3-3 to 3-8.
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015