Switching Elements On The Printed Circuit Boards - Siemens SIPROTEC 7VU681 User Manual

Mounting And Commissioning
3.1 Mounting And Connections
The following must be observed:
• Disconnect the ribbon cable between the front cover and the C-CPU-2 board (in Figures Figure 3-2) at the
front cover side. To disconnect the cable, push up the top latch of the plug connector and push down the
bottom latch of the plug connector. Carefully set aside the front cover.
• Disconnect the ribbon cables between the C-CPU-2 board (1) and the I/O boards (2) to (4), depending on
the variant ordered).
• 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 C-CPU-2 module due to the existing plug connectors.
• Check the jumpers in accordance with Figures 3-2 to 3-9 and the following information, and as the case may
be change or remove them.
Figure 3-2

3.1.2.3 Switching Elements on the Printed Circuit Boards

Processor Module C-CPU-2
The PCB layout of the processor board C-CPU-2 is illustrated in the following Figure. The set nominal voltage
of the integrated power supply is checked according to Table 3-1, the quiescent state of the life contact
according to Table 3-2, the selected operating voltages of binary inputs BI1 to BI5 according to Table 3-3 and
the integrated interface RS232 / RS485 according to Tables 3-4 to 3-2. The location and ratings of the
miniature fuse (F1) and of the buffer battery (G1) are shown in the following Figure.
64
Front view of a 7VU681 (housing size 1/1) after removal of the front cover (simplified and scaled
down)
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012