Chapter 4. Physical Architecture
M7IRDA2003I
7IRD-A/J/M: Distribution Protection & Control Terminal
© ZIV APLICACIONES Y TECNOLOGÍA, S.L.U. 2020
4-4
4.4
Connection Elements
4.4.1
Terminal Connectors and Connector Blocks
The terminal blocks are horizontally aligned as shown in preceding figure and arranged in rows
as follows:
-
Protection Circuit Board 1 terminal block having 10 connectors and 2 terminal block
having 24 connectors.
-
Control Circuit Board 1 terminal block having 10 connectors and 2 terminal block
having 24 connectors.
-
Enlargement Control Circuit Board 3 terminal block having 24 connectors (maximum).
-
Measurement Circuit Board 2 terminal block having 10 connectors and 1 terminal block
having 24 connectors.
The association between each connector and the internal digital signals will depend of the IED
configuration. The analog current input terminals (10 connectors terminal block) admit wires of a
cross section up to 4 mm
2
#11 AWG. The rest of the circuits admit wires of up to 2.5 mm
2
#13AWG cross-section. Pointed terminal are recommended for the connection to the terminal
connectors.
4.4.2
Removing of Printed Circuit Boards (Non Self-shorting)
While it is possible to extract some of the electronic printed circuit boards,
the current circuit
terminal connectors are not self-shorting. Consequently, current transformer
secondaries must be short-circuited before proceeding with board removal.
The electronic pc boards have screws that should be removed before proceeding with the board
removal. Before performing this operation, the protection terminal should be
Out of Service
.
