Test Pattern Cell; Contact Test Cell; Test Leds Cell; Red And Green Led Status Cells - GE MiCOM P747 Agile Technical Manual

Chapter 14 - Commissioning Instructions
3.4

TEST PATTERN CELL

The Test Pattern cell is used to select the output relay contacts to be tested when the Contact Test cell is
set to Apply Test. The cell has a binary string with one bit for each user-configurable output contact, which
can be set to '1' to operate the output and '0' to not operate it.
3.5

CONTACT TEST CELL

When the Apply Test command in this cell is issued, the contacts set for operation change state. Once the
test has been applied, the command text on the LCD will change to No Operation and the contacts will
remain in the Test state until reset by issuing the Remove Test command. The command text on the LCD
will show No Operation after the Remove Test command has been issued.
Note:
When the Test Mode cell is set to Contacts Blocked the Relay O/P Status cell does not show the current status
of the output relays and therefore cannot be used to confirm operation of the output relays. Therefore it will be
necessary to monitor the state of each contact in turn.
3.6

TEST LEDS CELL

When the Apply Test command in this cell is issued, the user-programmable LEDs illuminate for
approximately 2 seconds before switching off, and the command text on the LCD reverts to No Operation.
3.7

RED AND GREEN LED STATUS CELLS

These cells contain binary strings that indicate which of the user-programmable red and green LEDs are
illuminated when accessing from a remote location. A '1' indicates that a particular LED is illuminated.
Note:
When the status in both Red LED Status and Green LED Status cells is '1', this indicates the LEDs illumination is
yellow.
3.8

PSL VERIFICIATION

3.8.1

TEST PORT STATUS CELL

This cell displays the status of the DDB signals that have been allocated in the Monitor Bit cells. If you move
the cursor along the binary numbers, the corresponding DDB signal text string is 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 IED. This allows you to test the Programmable Scheme
Logic (PSL).
3.8.2

MONITOR BIT 1 TO 8 CELLS

The eight Monitor Bit cells allows you to select eight DDB signals that can be observed in the Test Port
Status cell or downloaded via the front port.
Each Monitor Bit cell can be assigned to a particular DDB signal. You set it by entering the required DDB
signal number from the list of available DDB signals.
The pins of the monitor/download port used for monitor bits are as follows:
Monitor Bit
346
1 2 3 4 5 6 7 8
MiCOM P747
P747-TM-EN-1
P747-TM-EN-1.1