P12y/EN FT/D22 Technical Guide
User Guide
Page 10/108 MiCOM P125/P126/P127
The MiCOM relays are powered either from a DC (3 voltage ranges) or an AC
auxiliary power supply.
Any short time voltage interruption (<50ms) is filtered and regulated through the
auxiliary power supply.
The front panel enables the user to navigate through the menu to access data,
change settings, read measurements etc.
Eight LEDs on the front panel allow a clear and simple presentation of events. The
various detected alarms are stored and can be displayed on the back-lit LCD.
No Password is required to read and acknowledge (clear) these alarm messages.
On their rear terminals the MiCOM P125, P126 & P127 relays have a standard
RS485 port available. The user can choose, by ordering, the communication protocol
ModBus RTU, IEC 60870-5-103, Courier (when available), or DNP3 (when
available).
Using the communication channel RS485, all stored information (measurements,
alarms, and parameters) can be read and the settings can be modified if this
functionality is allowed by the chosen protocol.
Evaluation and modification of this data can be carried out on site with a normal PC
and the appropriate ALSTOM software.
RS485 based communication allows MiCOM P125, P126 & P127 relays to be directly
linked to a digital control system (e.g. MiCOM S10).
All the available data is then placed at the disposal of the supervisor and can be
processed either local or remotely.
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