scheider electric MiCOM P746, Technical Manual

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Firmware Design P746/EN FD/G31
MiCOM P746 (FD) 9-
13
2.8 Auxiliary power supply
The three input voltage options are the same as for main supply. The relay board is provided
as an alone board.
2.9 IRIG-B board
The IRIG-B board is an order option that can be fitted in the P746 to provide an accurate
timing reference for the relay. This is available as a modulated or de-modulated option
depending on the requirements. The IRIG-B signal is connected to the board via a BNC
connector on the back of the relay. The timing information is used to synchronize the relay’s
internal real-time clock to an accuracy of 1ms in the case of modulated. The internal clock is
then used for the time tagging of the event, fault maintenance and disturbance records.
2.10 Second rear communications
On ordering this board within a relay, both 2
nd
rear communications will become connection
and setting options. The user may then enable either one, or both, as demanded by the
installation.
There is a hardware option of a second rear communications port, which will run the Courier
language. This can be used over one of three physical links: twisted pair K-Bus (non-polarity
sensitive), twisted pair EIA(RS)485 (connection polarity sensitive) or EIA(RS)232.
The second rear comms. board and Ethernet board are mutually exclusive since they use
the same hardware slot. For this reason two versions of second rear comms. board are
available; one with an IRIG-B input and one without. The physical layout of the second rear
comms. board is shown in Figure .
P2083ENa
Language:
Courier always
Physical links:
EIA 232
or
EIA 485 (polarity sensitive)
or
K-Bus (non polarity sensitive)
SK5
SK4
Physical links are s/w selectable
Optional IRIG-B
Courier Port
(EIA232/EIA485)
Not used (EIA232)
FIGURE 7: REAR COMMS. PORT
FD