GE P24DM - Watchdog Contacts; Test LCD; Date and Time; Test Leds

The following group of tests verifies that the IED hardware and software is functioning correctly and should be
carried out with the supply applied to the IED
.
5.2.1 WATCHDOG CONTACTS
Using a continuity tester, check that the Watchdog contacts are in the following states:
Terminals Energised contact
3 - 5 Open
4 - 6 Closed
5.2.2 TEST LCD
The Liquid Crystal Display (LCD) is designed to operate in a wide range of substation ambient temperatures. For
this purpose, the IEDs hav
e an LCD Contrast setting. The contrast is factory pre-set, but it may be necessary to
adjust the contrast to give the best in-service display.
To change the contrast, you can increment or decrement the LCD Contrast cell in the CONFIGURATION column.
Caution:
Befor
e applying a contrast setting, make sure that it will not make the display so
light or dark such that menu text becomes unreadable. It is possible to restore the
visibility of a display by downloading a setting file, with the LCD Contrast set within
the typical range of 7 - 11.
5.2.3 DATE AND TIME
The date and time is stored in non-volatile memory. If the values are not already correct, set them to the correct
v
alues. The method of setting will depend on whether accuracy is being maintained by the IRIG-B port or by the
IED's internal clock.
When using IRIG-B to maintain the clock, the IED must first be connected to the satellite clock equipment (usually a
P594/RT430), which should be energised and functioning.
1. Set the IRIG-B Sync cell in the DATE AND TIME column to Enabled.
2. Ensure the IED is receiving the IRIG-B signal by checking that cell IRIG-B Status reads Active.
3. Once the IRIG-B signal is active, adjust the time offset of the universal co coordinated time (satellite clock
time) on the satellite clock equipment so that local time is displayed.
4. Check that the time, date and month are correct in the Date/Time cell. The IRIG-B signal does not contain
the current year so it will need to be set manually in this cell.
5. Reconnect the IRIG-B signal.
If the time and date is not being maintained by an IRIG-B signal, ensure that the IRIG-B Sync cell in the DATE AND
TIME column is set to Disabled.
1. Set the date and time to the correct local time and date using Date/Time cell or using the serial protocol.
5.2.4 TEST LEDS
On power-up, all LEDs should first flash yellow. Following this, the green "Healthy" LED should illuminate indicating
that the device is healthy.
The IED'
s non-volatile memory stores the states of the alarm, the trip, and the user-programmable LED indicators
(if configured to latch). These indicators may also illuminate when the auxiliary supply is applied.
Chapter 19 - Commissioning Instructions P24xM
406 P24xM-TM-EN-2.1