GE 745 Instruction Manual page 125

CHAPTER 5: SETPOINTS
5.3.4 Resetting
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RESETTING
5.3.5 Clock
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CLOCK [
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
PATH: SETPOINTS S1 745 SETUP
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MESSAGE
The reset function performs the following actions: all latched relays are set to the non-
operated state and latched target messages are cleared, if the initiating conditions are no
longer present. Resetting can be performed in any of the following ways: via RESET on the
front panel while the 745 is in local mode (i.e. the Local LED indicator is on); via a logic input;
via any of the communication ports.
• LOCAL RESET BLOCK: The 745 is defaulted to the local mode. As a result, the front
panel (local) RESET key is normally operational. Select any logic input, virtual input,
output relay, or virtual output which, when asserted or operated, will block local mode,
and hence the operation of the front panel RESET.
• REMOTE RESET SIGNAL: Select any logic input which, when asserted, will (remotely)
cause a reset command.
PATH: SETPOINTS S1 745 SETUP
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MESSAGE
MESSAGE
A supercap-backed internal clock runs even when control power is lost. With control
power off, the clock continues to run for 45 days. The clock is accurate to within 1 minute
per month. An IRIG-B signal may be connected to the 745 to synchronize the clock to a
known time base and to other relays. The clock performs time and date stamping for
various relay features, such as event and last trip data recording. Without an IRIG-B signal,
the current time and date must be entered in a new relay for any time and date displayed.
If not entered, all message references to time or date will display "Unavailable". With an
IRIG-B signal, only the current year needs to be entered.
• DATE: Enter the current date, using two digits for the month, two digits for the day,
and four digits for the year. For example, April 30, 1996 would be entered as "04 30
1996". If entered from the front panel, the new date will take effect at the moment of
pressing the ENTER key.
• TIME: Enter the current time by using two digits for the hour in 24 hour time, two digits
for the minutes, and two digits for the seconds. The new time takes effect at the
moment of pressing the ENTER key. For example, 3:05 PM is entered as "15 05 00", with
the ENTER key pressed at exactly 3:05 PM.
• IRIG-B SIGNAL TYPE: Select the type of IRIG-B signal being used for clock
synchronization. Select "None" if no IRIG-B signal is to be used.
RESETTING
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LOCAL RESET
BLOCK: Disabled
REMOTE RESET
SIGNAL: Disabled
CLOCK
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DATE (MM/DD/YYYY):
01/01/1996
TIME (HH:MM:SS):
00:00:00
IRIG-B SIGNAL TYPE:
None
S1 745 SETUP
Range: Enabled, Disabled
Range: Enabled, Disabled
Range: 1 to 12 / 1 to 31 / 1990 to 2089
~
Range: 0 to 23 : 0 to 59 : 0 to 59
Range: None, DC Shift, Amplitude
Modulated
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