Eaton EDR 3000 Installation, Operation And Maintenance Manual page 378

If for any reason only one breaker contact (52a or 52b) is wired, the Single Contact Indication can be used.
Single Contact Indication
The moving time supervision works only in one direction. If the 52a signal is connected to the device, only the "CLOSE
command" can be supervised and if the 52b signal is connected to the device, only the "OPEN command" can be
supervised.
If the single contact indication is used, the »SI S
Single Contact Indication – 52a only
If only the 52a signal is used for the Status Indication of an "CLOSE command", the switch command will also start the
moving time, the position indication indicates an INTERMEDIATE position during this time interval. When the
switchgear reaches the end position indicated by the Pos CLOSE signal, the moving time will be terminated. If the
moving time elapsed before the switchgear has reached the end position, the switching operation was not successful
and the Position Indication will change to Pos DISTURB.
An OPEN command also starts the moving time. Because the device does not receive an open signal by the breaker, it
assumes that the breaker is in open position after the moving time has elapsed.
The following table shows how breaker positions are validated based on 52a only:
States of the Digital Input
CinBkr52a-I
0
0
1
1
NOTICE: In case of single contact indication, the protective device can monitor either the
52a or the 52b contact only. In case of the 52a, the device will monitor / supervise the
CLOSE command. In case of the 52b, the device will monitor / supervise the OPEN
command.
CinBkr52b-I Pos CLOSE
Not wired
Not wired
Not wired
Not wired
EDR-3000
C I « will become true.
INGLE ONTACT ND
Validated Breaker Positions
Pos OPEN
0 0
0 1
1 0
0 0
www.eaton.com
Pos Indeterm Pos Disturb
1 0
(while t-Move (while t-Move
CLOSE is CLOSE is
running) running)
0 0
0 0
0 1
(after t-Move (after t-Move
CLOSE is CLOSE is
elapsed) elapsed)
IM02602003E
Breaker
State
0
Intermediate
1
OFF
2
ON
3
Disturbed
366