Micom P721, Technical Manual

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P72x/EN FT/C21 User Guide
Page 8/38 MiCOM P721/P723
These LEDs are user programmable and can be set to display information about
instantaneous and time-delayed thresholds as well as the status of the logic inputs. Under
the CONFIGURATION/LED menu of the relay, the user can select the information he wishes
to associate with each LED. He can affect more than one function to one LED. The LED will
then light up when at least one of the associated information is valid (OR gate). The LED is
cleared when all the associated alarms are acknowledged.
1.1.5 Description of the two areas under the top and bottom flaps
1.1.5.1 Relay Identification
Under the upper flap, a label identifies the relay according to its model number (order
number) and its serial number. This information defines the product in a way that is unique.
In all your requests, please make reference to these two numbers.
Under the model and serial number, you will find information about the level of voltage of the
auxiliary supply and the nominal earth current value.
1.1.5.2 Lower flap
Under the lower flap, a RS232 port is available in all MiCOM relays. It can be used either to
download a new version of the application software version into the relay flash memory or to
download/retrieve settings plugging a laptop loaded with MiCOM S1 setting software.
To withdraw more easily the active part of the MiCOM relay (i-e the chassis) from its case,
open and remove the two flaps, then with a 3mm screwdriver, turn the extractor located
under the upper flap, and pull it out of its case pulling the flaps towards you.
1.1.6 The USB/RS232 cable (to power and set the relay)
The USB/RS232 cable is able to perform the following functions:
1. It is able to power the relay from its front port. This allows the user to view or modify
data on the relay even when the auxiliary power supply of the relay has failed or when
the relay is not connected to any power supply. The USB port of the PC supplies the
power necessary to energize the relay. This lasts as long as the battery of the PC can
last.
2. It provides an USB / RS 232 interface between the MiCOM relay and the PC. This
allows the user to be able to change the setting of the relay using a PC with its USB
port.
It eases the use of the relay allowing the retrieval of records and disturbance files for
example when the auxiliary supply has failed or is not available.
The associated driver (supplied with the relay) needs to be installed in the PC. For more
information, refer to MiCOM E2 User Guide.