Hardware Design - ABB REC 561 User Manual

ABB Network Partner AB
Version 1.0-00
October 1996
Function:

1 Hardware design

Construction and hardware
characteristics - REC 561
Basic
The terminal is supplied in a closed case that is a standard 19" wide rack
and 6U high.
This terminal is made with a technology that fulfils all modern electro-
magnetic interference requirements. Tests, such as fast transient test and
radio frequency sensitivity test, are new requirements. These requirements
are fulfilled by having a closed and welded steel case. The terminal has
very good separation between the internal, sensitive signals, and the exter-
nal, polluted process signals. This is done by keeping all process signals
in the back of the case, (for convenient wiring) and a mother-board
(behind the front cover made in one piece), where all sensitive bus com-
munication runs (both analogue parallel and binary serial communica-
tion).
All external serial buses for Substation Automation (SA), Station Moni-
toring System (SMS), and the front-connected PC are isolated with fibre
optical links to avoid disturbances. This, in combination with a good
design of transformers, power supply and binary inputs provide a terminal
that can withstand the electromagnetic interference tests with a margin.
The product is based on harmonized standards. Refer to the industry
standards EN 50 081-2 (emission) and EN 50 082-2 (immunity) concern-
ing the EMC directive. EN 50 081-2 refers to basic standard EN 55 011.
The product is a class A product according to EN 55 011. In residential,
commercial and light-industry environments, this product may cause
radio interference; so users might need to take adequate measures.
1MRK 580 148-XEN
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