Reassembly - Siemens SIPROTEC 7SJ62 Manual

Mounting and Commissioning
3.1 Mounting and Connections
IEC 60870–5–103 redundant
Figure 3-23 Location of the jumpers for configuration of the terminating resistors
Termination
For bus-capable interfaces a termination is necessary at the bus for each last device, i.e. termination resistors
must be connected. With 7SJ62/64, this applies to variants with an RS485 or Profibus interface.
The terminating resistors are located on the RS485 or Profibus interface module that is mounted to the proces-
sor input/output board CPU (serial no. 1 in Figures 3-3 to 3-6).
With default setting the jumpers are set such that the termination resistors are disconnected. Both jumpers of
a board must always be plugged in the same way.
The terminating resistors can also be connected externally (e.g. to the terminal block), see Figure 3-14. In this
case, the terminating resistors located on the RS485 or PROFIBUS interface module must be switched off.

3.1.2.6 Reassembly

To reassemble the device, proceed as follows:
• Carefully insert the boards into the case. The mounting locations are shown in Figures 3-3 to 3-6. For the
model of the device designed for surface mounting, use the metal lever to insert the processor circuit board
CPU board. The installation is easier with the lever.
• First plug the plug connectors of the ribbon cable into the input/output boards I/O and then onto the proces-
sor module CPU. Do not bend any connector pins ! Do not use force !
• Insert the plug connector of the ribbon cable between the processor module CPU and the front cover into
the socket of the front cover. This action does not apply to the device version with detached operator panel.
Instead the plug connector of the ribbon cable connected to a 68pole plug connector on the rear side of the
device must be plugged into the plug connector of the processor circuit board CPU. The 7pole X16 connec-
tor belonging to the ribbon cable must be plugged behind the D-subminiature female connector. The plug-
ging position is not relevant in this context as the connection is protected against polarity reversal.
• Press the latches of the plug connectors together.
• Replace the front cover and secure to the housing with the screws.
• Put the covers back on.
• Re-fasten the interfaces on the rear of the device housing. This activity is not necessary if the device is de-
signed for surface mounting.
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SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008