Alstom MiCOM P846, Техническое руководство

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Commissioning P846/EN CM/D
MiCOM P846
(CM) 10-5
2.2 Relay O/P status
This menu cell displays the status of the digital data bus (DDB) signals that result in
energization of the output relays as a binary string, a ‘1’ indicating an operated state and ‘0’
a non-operated state. If the cursor is moved along the binary numbers the corresponding
label text will be displayed for each relay output.
The information displayed can be used during commissioning or routine testing to indicate
the status of the output relays when the relay is ‘in service’. Additionally fault finding for
output relay damage can be performed by comparing the status of the output contact under
investigation with its associated bit.
Note: When the ‘Test Mode’ cell is set to ‘Enabled’ this cell will continue to
indicate which contacts would operate if the relay was in-service, it
does not show the actual status of the output relays.
2.3 Test port status
This menu cell displays the status of the eight digital data bus (DDB) signals that have been
allocated in the ‘Monitor Bit’ cells. If the cursor is moved along the binary numbers the
corresponding DDB signal text string will be displayed for each monitor bit.
By using this cell with suitable monitor bit settings, the state of the DDB signals can be
displayed as various operating conditions or sequences are applied to the relay. Thus the
programmable scheme logic can be tested.
As an alternative to using this cell, the optional monitor/download port test box can be
plugged into the monitor/download port located behind the bottom access cover. Details of
the monitor/download port test box can be found in sub-section 2.10 of this section
(P846/EN CM).
2.4 LED status
The ‘LED Status’ cell is an eight bit binary string that indicates which of the user-
programmable LEDs on the relay are illuminated when accessing the relay from a remote
location, a ‘1’ indicating a particular LED is lit and a ‘0’ not lit.
2.5 Monitor bits 1 to 8
CM
The eight ‘Monitor Bit’ cells allow the user to select the status of which digital data bus
signals can be observed in the ‘Test Port Status’ cell or via the monitor/download port.
Each ‘Monitor Bit’ is set by entering the required digital data bus (DDB) signal number
(0 – 1022) from the list of available DDB signals in section P846/EN PL. The pins of the
monitor/download port used for monitor bits are given in the table below. The signal ground
is available on pins 18, 19, 22 and 25.
Monitor bit 1 2 3 4 5 6 7 8
Monitor/download port pin 11 12 15 13 20 21 23 24
THE MONITOR/DOWNLOAD PORT DOES NOT HAVE ELECTRICAL ISOLATED
AGAINST INDUCED VOLTAGES ON THE COMMUNICATIONS CHANNEL. IT SHOULD
THEREFORE ONLY BE USED FOR LOCAL COMMUNICATIONS.