Alstom MiCOM P54 Series, Technical Manual, Page: 807 / 1024

Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-59
CM
9.1.3 Communications using P592 interface units
Return to the P592 units.
Ensure that all external wiring that has been removed to facilitate testing is replaced in
accordance with the relevant connection diagram or scheme diagram.
Set the ‘V.35 LOOPBACK’ switch to the ‘0’ position.
Set the ‘CLOCK SWITCH’, ‘DSR’, ‘CTS’ and ‘DATA RATE’ DIL switches on each unit to the
positions required for the specific application and ensure the ‘OPTO LOOPBACK’ switch is in
the ‘0’ position.
If applicable, replace the secondary front cover on the P592 units.
9.1.4 Communications using P593 interface units
Return to the P593 units.
Ensure that all external wiring that has been removed to facilitate testing is replaced in
accordance with the relevant connection diagram or scheme diagram.
Set the ‘X.21 LOOPBACK’ switch to the ‘OFF’ position and ensure the ‘OPTO LOOPBACK’
switch is also in the ‘OFF’ position.
If applicable, replace the secondary front cover on the P593 units.
9.2 Remote loopback removal
9.2.1 Remove loopbacks at remote terminal connected to channel 1
Repeat sections 9.1.1 to 9.1.4 as necessary at the remote end relay connected to channel 1.
9.2.2 Remove loopbacks at remote terminal connected to channel 2
Repeat sections 9.1.1 to 9.1.4 as necessary at the remote end relay connected to channel 2.
9.3 Verify communications between relays
9.3.1 Communications statistics and status – non GPS synchronised.
Reset any alarm indications and check that no further communications failure alarms are
raised. Check channel status and propagation delays in [MEASUREMENTS 4] column for
channel1 (and channel 2 where fitted). Specifically check that the first two bits in ‘Channel
Status’ (Rx and Tx) are displaying ‘1’ i.e. 11************ (where * indicates a ‘don’t care’
state). Clear the statistics and record the number of valid messages and the number of
errored messages after a minimum period of 1 hour. Check that the ratio of errored/good
messages is better than 10
-4
. Record the measured message propagation delays for channel
1, and channel 2 (if fitted).
9.3.2 Communications statistics and status – GPS synchronised with P594
Reset any alarm indications and check that no further communications failure alarms are
raised. Check channel status and propagation delays in [MEASUREMENTS 4] column for
channel1 (and channel 2 where fitted). Specifically check that the first four bits in ‘Channel
Status’ (Rx, Tx, Local GPS, and remote GPS) are displaying ‘1’ i.e. 1111********** (where *
indicates a ‘don’t care’ state). Clear the statistics and record the number of valid messages
and the number of errored messages after a minimum period of 1 hour. Check that the ratio
of errored/good messages is better than 10
-4
. Record the measured message propagation
delays for channel 1, and channel 2 (if fitted).