3 Operation
3.1 Modular Structure
The P634 is a numerical device out of Schneider Electric's family of devices
named “Easergy MiCOM 30”. The device types included in this family are built
from identical uniform hardware modules. The figure below shows the basic
hardware structure of the P634.
Analog bus module
Voltages Currents
Signals
Commands
Signals
Commands
Signals
Commands
Measured data
Auxiliary voltage
Signals
Commands
Signals
Commands
T X Y V
B
μP
P
A A
L
Local control module
Digital bus module
Analog bus module
Analog I/O module
Processor module
Binary I/O module
Transformer module
Power supply module
PC interface
Communication
interface(s)
F1
F2
F3
F4
F5
F6
Fig. 3-1: Basic hardware structure.
External analog quantities and binary quantities – electrically isolated – are
converted to the internal processing levels by the peripheral modules T, Y, and X.
The optional binary I/O modules X are equipped with optical couplers for binary
signal input as well as output relays for the output of signals and commands or
combinations of these.
The external auxiliary voltage is applied to the power supply module V, which
supplies the auxiliary voltages that are required internally.
Analog data is transferred from the transformer module T via the analog bus
module B to the processor module P. The processor module contains all the
elements necessary for the conversion of measured analog variables, including
multiplexers and analog/digital converters. The analog data conditioned by the
analog I/O module Y is transferred to the processor module P via the digital bus
module.
The processor handles the processing of digitized analog variables and of binary
signals, generates the protective trip and signals, and transfers them to the
binary I/O modules X via the digital bus module. The processor module also
handles overall device communication.
P634
P634/EN M/R-42-A // P634‑311‑653 3-1
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