6-2 BE1-951 Reporting and Alarm Functions 9328900990 Rev L
CLOCK
The BE1-951 provides a real-time clock with capacitor backup that is capable of operating the clock for up
to eight hours after power is removed from the relay. The clock is used by the demand reporting function,
the fault reporting function, the oscillograph recording function, and the sequence of events recorder
function to time-stamp events. The clock function records the year in two-digit format.
Optionally, a battery backup may be installed. The battery will maintain the clock for up to five years. See
Section 13, Testing and Maintenance, for maintenance of battery.
IRIG Port
IRIG time code signal connections are located on the rear panel. When a valid time code signal is
detected at the port, it is used to synchronize the clock function. Note that the IRIG time code signal does
not contain year information. For this reason, it is necessary to enter the date even when using an IRIG
signal. Year information is stored in nonvolatile memory so that when operating power is restored after an
outage and the clock is re-synchronized the current year is restored. When the clock rolls over to a new
year, the year is automatically incremented in nonvolatile memory. An alarm bit is included in the
programmable alarm function for loss of IRIG signal. The alarm point monitors for IRIG signal loss once a
valid signal is detected at the IRIG port.
The IRIG input is fully isolated and accepts a demodulated (dc level-shifted) signal. The input signal must
be 3.5 volts or higher to be recognized as a valid signal. Maximum input signal level is +10 to -10 volts
(20 volt range). Input resistance is nonlinear and rated at 4 kΩ at 3.5 volts.
Setting the Clock Function
Time and date format settings are made using BESTCOMS.
Figure 6-2 illustrates the BESTCOMS screen
used to select time and date format settings. To open the screen, select Reporting and Alarms from the
S
creens pull-down menu. Then select the Clock Display Mode tab. Alternately; settings may be made
using the SG-CLK ASCII command. Refer to
Table 6-2, SG-CLK Command Settings.
Figure 6-2. Reporting and Alarms Screen, Clock Display Mode Tab
Time and date reporting can be displayed in 12 or 24-hour format. When operating in the 12-hour format,
the A.M./P.M. parameter is placed between the minutes and seconds parameters (10:24P23.004
indicates 10:24 in the evening). The default time format is 24 hours. Date reporting format can display the
date in mm/dd/yy or dd/mm/yy format. The default date format is mm/dd/yy. The relay clock can also
accommodate daylight saving time changes. Automatic daylight saving time adjustments are optional and
are disabled by default.
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