Watchdog Contacts; Test Lcd; Date And Time - GE MiCOM P747 Agile Technical Manual

Chapter 14 - Commissioning Instructions
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
11 - 12 on power supply board
13 - 14 on power supply board
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 have 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:
Before 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 memory, which is backed up by an auxiliary battery situated at the front of the
device behind the lower access cover. When delivered, this battery is isolated to prevent battery drain during
transportation and storage.
Before setting the date and time, ensure that the isolation strip has been removed. With the lower access
cover open, the battery isolation strip can be identified by a red tab protruding from the positive side of the
battery compartment. Press on the battery lightly, to prevent it from falling out of the battery compartment,
then pull the red tab to remove the isolation strip.
The date and time should now be set to the correct values. The method of setting will depend on whether
accuracy is being maintained by the IRIG-B port at the rear, or by the IED's internal clock.
Note:
If the auxiliary supply fails, the time and date will be maintained by the auxiliary battery. Therefore, when the auxiliary
supply is restored, you should not have to set the time and date again. To test this, remove the IRIG-B signal, and
then remove the auxiliary supply. Leave the device de-energised for approximately 30 seconds. On re energization,
the time should be correct.
When using IRIG-B to maintain the clock, the IED must first be connected to the satellite clock equipment
(usually a P594), 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.
352
De-energised contact
Open
Closed
MiCOM P747
P747-TM-EN-1
P747-TM-EN-1.1