SERVICE MANUAL R5888B
QUADRAMHO Chapter 7
Page 1 of 2
Section 1. MODULES
Modules are identified by a 12 character coding. This is known as a 3 alpha
coding and is split up as follows:
XYZ 00 000 000 A
The first three characters are letters, which with the next five numbers, specify all
variations which will affect the circuit diagram of the module. The last three
numbers affect parameters such as ratings, time ranges etc. which do not affect the
circuit diagram but affect component values. The last letter is a design suffix.
The circuit diagram of a module is referenced L1 XYZ 00 000.
The external connection diagram of a module is referenced L10 XYZ 00.
The variations covered by the first group of three letters are all dealt with on the
one drawing. If the function of a module is not explicit, then it will be referred to on
the diagrams.
Section 2. CASES
The complete identification of a case or subrack (a subrack is a single tier housing)
is a nineteen character coding. The first four characters are letters and the next
three are numbers. These seven characters, together with the eighth indicate only
the type of mounting. The rest of the coding is either a sequential number with
design issue suffix, or a coding which relates to module parameters only and does
not affect case circuit diagrams.
The case terminals and their functions are shown on the external connection or
application diagrams. As with the module diagrams, these are specified by a
drawing number of the form L10 WXYZ 000, where 10 means external connection
diagram and WXYZ 000 is the coding of the equipment concerned.
For small equipment, the system or scheme diagram which indicates how the relay
is connected to other equipment, may carry a coding L12 WXYZ 000 or L14
WXYZ 000. Here again WXYZ 000 is the equipment identification.
The connections between modules and case terminals are shown on drawing S1
WXYZ 000. This cross refers the equipment connection diagram and module
circuit diagram.
Section 3. SCHEMES
Where an auxiliary subrack forms part of a more complex scheme, that is, in
conjunction with other ALSTOM T&D Protection & Control equipment, a coding
comprising five letters and six numbers is used. The related scheme or system
diagrams are coded L12 VWXYZ 000 000 or L41 VWXYZ 000 000 where the
numbers 12 or 14 indicate ‘tender’ or ‘contract’, respectively. The numbers
following the coding are required for complete identification.
To Next Page
Loading...