Areva MiCOM P225, Technical Manual

Page: 107 / 288

User Guide P225/EN FT/B11
MiCOM P225 Page 51/52
5. AUXILIARY FUNCTIONS
5.1 Event records
The MiCOM P225 relay records 75 state changes in non-volatile memory and dates with a
1ms accuracy. For each state change (event) the relay gives the date, time and label.
This applies to any change of state of the logic inputs/outputs, the alteration of one or
several setting parameters, alarm or triggering data. Please refer to Chapter CT-
Communications for more information.
The recordings of the consignment of states can be downloaded:
•
either using the remote communication network (RS485 rear port)
•
or using the MiCOM S1 support software (RS232 front port)
N.B.: – The data are recorded in non volatile memory and are available for
one year without auxiliary power, thanks to a back-up battery
housed in the front face.
– These consignments are not erasable. They are managed in a
circular list: when this is full, the change of state of the oldest is
erased.
5.2 Recording of the form of the starting current and voltage
The MiCOM P225 relay records the form of current and voltage of the latest start. In order to
do this, it records every 5 cycles (every 100 ms if the frequency is at 50 Hz) the maximum
value of one of the three line currents, and the value of the line-line voltage V
A-C
. The values
recorded are expressed in True RMS values.
The recording is initiated following detection by the relay of an motor start up, it stops at the
end of the tl
start
time delay allocated to the start up.
The file containing the recording of the form of the starting current can be repatriated on a
PC:
•
either using the remote communication network (RS485 rear port)
•
or using the MiCOM S1 support software (RS232 front port). The data will be stored in
COMTRADE format.
N.B.: – The data are recorded in non volatile memory and are available for
one year without auxiliary power, thanks to a back-up battery
housed in the front face.
– The maximum duration of a recording is limited to 200 seconds.
5.3 Standard remote control via the RS485 communications port
In the AUX OUTPUT RLY sub-menu, it is possible to assign the ORDER1 information to one
or several output relays.
A communications command (via the RS485 port) issues the ORDER1 information, which is
latched during a fixed 200ms period.
5.4 Block start via the RS485 communications port
In the AUX OUTPUT RLY sub-menu, it is possible to assign the ORDER2 information to one
or several output relays.
A communication command (via the RS485 port) issues the ORDER2 information which is
latched until another communication command (via the RS485 port) makes the first one drop
off.
Inserting an output relay, to which the ORDER2 information has been assigned, into the start
coil circuit allows a supervisor to remotely block/authorise a motor re-start.