Micom P721, Technical Manual

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Commissioning and Maintenance P72x/EN CM/C21
MiCOM P721/P723 Page 7/28
3.8 Logic outputs
This test checks that all outputs are functioning correctly. The P723 has 8 outputs whereas
the P721 has 4 outputs.
The Watchdog normally-closed contact is in terminals 35-36 and the Watchdog normally-
open contact is in terminals 35-37.
RL1 and RL2 are change-over relays (2-4-6, 8-10-12).
RL3 to RL4 are normally open relays (14-16, 18-20).
RL5 to RL8 are normally open relays (1-3, 5-7, 11-9, 15-13).
Each output contact may have its own independent power supply (refer to wiring schemes).
To view the status of the outputs, use the menu OP. PARAMETERS > Relay Status .
1 indicates a closed output relay and 0 indicates an open output relay. When each output
relay is closed, one of the corresponding characters on the bottom line of the menu display
changes to the value shown in the following table to indicate the new state of the output.
OUTPUT MiCOM P72x models
OP. PARAMETERS >
RelayStatus
cell value
RL 1
2-4-6 Terminals
P721, P723 00000001
RL 2
8-10-12 Terminals
P721, P723 00000010
RL 3
14-16 Terminals
P721, P723 00000100
RL 4
18-20 Terminals
P721, P723 00001000
RL 5
1-3 Terminals
P723 00010000
RL 6
5-7 Terminals
P723 00100000
RL 7
11-9 Terminals
P723 01000000
RL 8
15-13 Terminals
P723 10000000
3.9 RS 485 rear communication
This test should only be performed where the relay is to be accessed from a remote location
and will vary depending on the communication protocol being used (refer to the label under
the upper flap).
The test is not intended to verify the operation of the complete system from the relay to the
remote location, just the relay's rear communication port and any protocol converter
necessary.
Connect a laptop PC to the RS485 rear port (for instance via an ACKSYS for Courier
communication) and check the communication.