Areva MiCOM P441, Technical Manual

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P44x/EN CM/E33 Commissioning
Page 8/54 MiCOM P441/P442 & P444
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B
C
D E
F G
H
J K L
M
N
A
IRIG-B
TX
RX
P3003ENa
FIGURE 1C - REAR TERMINAL BLOCKS ON SIZE 80TE CASE (P444)
4.1.2 Current Transformer Shorting Contacts
If required, the current transformer shorting contacts can be checked to ensure that they
close when the heavy duty terminal block (block reference C in figure 1) is disconnected
from the current input PCB.
The heavy duty terminal block is fastened to the rear panel using four crosshead screws.
These are located top and bottom between the first and second, and third and fourth,
columns of terminals.
NOTE: The use of a magnetic bladed screwdriver is recommended to
minimize the risk of the screws being left in the terminal block or lost.
Pull the terminal block away from the rear of the case and check that all the shorting
switches being used are closed with a continuity tester. table 1 shows the terminals between
which shorting contacts are fitted.
1 19 3 2
4
20
6 5
7
21
9 8
10 22 12 11
13 23 15 14
16 24 18 17
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Heavy duty terminal block Medium duty terminal block
P3004ENa
FIGURE 2 - LOCATION OF SECURING SCREWS FOR TERMINAL BLOCKS