Repair Instruction; Maintenance - ABB REC 561 User Manual

ABB Network Partner AB
Version 1.0-00

6 Repair instruction

7 Maintenance

Installation and commissioning
When a module in any terminal needs repair, the whole terminal can be
removed and sent to ABB.
An alternative to this can be to disassemble the terminal and send only the
faulty circuit board to ABB for repair. When a printed circuit board is
transported to ABB, it must always be placed in a metallic protection bag
(closest to the card) which is ESD-proof (electrostatic discharge). You can
also purchase separate modules for replacement.
Note: Follow all power company safety rules.
Before disassembling the terminal, remember the consequences of the
ESD phenomenon. Most electronic components are sensitive to electro-
static discharge, and latent damage may occur, unless measures are taken.
To prevent this, use an ESD wrist strap. A semi-conducting cover must be
places on the workbench. The cover must be connected to earth.
Disassemble the terminal like this:
1. Switch off the dc supply.
2. Short-circuit all current inputs and disconnect all voltage connec-
tors.
3. Disconnect all signal connectors.
4. Disconnect the optical fibres.
5. Unscrew the main back plate of the terminal.
6. Unscrew the small back plate of the terminal— if the transformer
module is to be changed.
7. Pull out the module that needs repair.
8. Check that the springs on the card rail have connection to the corre-
sponding metallic area on the circuit board when the new module is
pushed in.
9. Reassemble the terminal.
If the terminal has the option Increased measuring accuracy, a file with
calibration data which is unique for the Transformer module is stored in
the Main processing module. Therefore it is not possible to change only
one of these modules with maintained accuracy.
The terminal is self-supervised. No special maintenance is required.
But you must follow the instructions of the power company and other
maintenance directives that are valid for the maintenance of the power
system.
1MRK 580 166-XEN
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