Input Board; Figure 19: Input Board - GE P4A Technical Manual

Chapter 3 - Hardware Design
6.5.3

INPUT BOARD

Figure 19: Input board

The input board is used to convert the analogue signals delivered by the current and voltage transformers into
digital quantities used by the IED. This input board also has on-board opto-input circuitry, providing eight optically-
isolated digital inputs and associated noise filtering and buffering. These opto-inputs are presented to the user by
means of a MD terminal block, which sits adjacent to the analogue inputs HD terminal block.
The input board is connected physically and electrically to the transformer board to form a complete input module.
The terminal numbers of the opto-inputs are as follows:
Terminal Number
Terminal 1
Terminal 2
Terminal 3
Terminal 4
Terminal 5
Terminal 6
Terminal 7
Terminal 8
Terminal 9
Terminal 10
Terminal 11
Terminal 12
Terminal 13
Terminal 14
Terminal 15
Terminal 16
50
Opto 1 -ve
Opto 1 +ve
Opto 2 -ve
Opto 2 +ve
Opto 3 -ve
Opto 3 +ve
Opto 4 -ve
Opto 4 +ve
Opto 5 -ve
Opto 5 +ve
Opto 6 -ve
Opto 6 +ve
Opto 7 –ve
Opto 7 +ve
Opto 8 –ve
Opto 8 +ve
Opto-input
P54A/B/C/E
P54xMED-TM-EN-1