Siemens 7SA511 manual Real-Time Clock, Date, Set Time, Difference Time

7SA511 Line Protection RelayChapter 5

5.7.2 Real-Time Clock (8100)

The parameters in address block 8100 control the relay’s internal real-time clock and allow you to change the date and time. Also, you can optionally enter a difference time that is used to adjust the clock forward or backward or to synchronize the clock with another reference.

For the real-time clock and calendar to maintain the correct date and time in the event of a pow supply failure, the backup battery must be installed in the relay. See Chapter 4 section 4.3, “Installing the Relay’s Backup Battery,” for installation instructions.

When the relay is initially installed and energized, the date and time must be set. With address

block 8100 (shown below) displayed, press the key to display the date and time under address

8101.* Continue to press the key to go to address 8102 to change the date, address 8103 to change the time, etc. Enter the relay password (see section 5.3.2) to change the date or time. The “T.CLOCK ADJUSTED” message will display after a date or time change.

The message “ENTRY ERROR” will appear if you incorrectly enter the date or time. Press Enter to clear this message8100SETREALTIMECLOCKand returnTINGto programming mode.

(Address10/1/19946:49:288 01)	The date format options at address 7003 (see
	section 5.7.1) are MM/DD/YYYY or DD.MM.YYYY.

The time is displayed in 24 hour format, which cannot be changed.

Date

A date can be entered at address 8102. When entering the date, the period (.) key is used as the separator between days, months, and years. Also, the entry must be made using two digits for the month, two digits for the day, and four digits for the year (i.e., MM.DD.YYYY or DD.MM.YYYY).

Set Time

The clock can be set by entering a time at address 8103. Enter the time in 24 hour format using two digits each for hours, minutes, and seconds (i.e., HH.MM.SS). The period (.) key is used as the separator between hours, minutes, and s conds.

Difference Time

The clock can be adjusted by specifying a difference time at address 8104. In this case, the clock is adjusted forward or backward by the amount of time entered. To adjust the clock forward, enter the difference time, then press the Enterkey. To adjust the clock backward, enter the

*Direct access to address 8101 will also display the date and time setting.

July 27, 1995 5-17