GE P642, Technical Manual

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Terminals Contact state with product energised
13 - 14 on power supply board 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 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. Pull the red tab to remove the isolation strip.
The method for setting the date and time depends on whether an IRIG-B signal is being used or not. The IRIG-B
signal will override the time, day and month settings, but not the initial year setting. For this reason, you must
ensure you set the correct year, even if the device is using IRIG-B to maintain the internal clock.
You set the Date and Time by one of the following methods:
● Using the front panel to set the Date and Time cells respectively
●
By sending a courier command to the Date/Time cell (Courier reference 0801)
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 energisation, 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
.
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.
P64x Chapter 19 - Commissioning Instructions
P64x-TM-EN-1.3 419