8-16 Breaker/Recloser Monitor, Battery System Monitor, Date Code 990430
Metering, and Load Profile Functions
SEL-351P Manual Técnico
SER report. See Section 12: Standard Event Reports and SER for information on the SER
report. If a serial port is active or the front panel is in use (i.e., the front-panel pushbuttons are
being pressed), the 10-minute time period is extended. If the temperature-compensated battery
voltage then falls below 70%, the SEL-351P puts itself to sleep immediately, regardless of any
other conditions.
Keep 12 Vdc on While SEL-351P is “Asleep”
If both
the following conditions are true when the SEL-351P puts itself to sleep, due to having
reached the % Battery capacity for sleep setting (e.g., 20% capacity):
• Setting Keep the 12 V power on while asleep = Y
• And the temperature-compensated battery voltage is above 80%
then the 12 Vdc power is kept on. This 12 Vdc power is available at the terminal block (see
Figure 9 in the SEL-351P Quick-Start Installation and User’s Guide). Use the 12 Vdc power
for such applications as keeping a radio on. If the temperature-compensated battery voltage falls
below 80%, the 12 Vdc power is shut off.
“Wake Up” the SEL-351P
When the SEL-351P is in the sleep mode, it wakes up when any of the following occur:
• The 120 Vac source is reenergized
• The front-panel WAKE UP pushbutton is operated
• A “wake-up” message is received via the side panel Wake-up port
If the SEL-351P went to sleep because the temperature-compensated battery voltage fell below
80%, the Wake-up port is dead and cannot receive the wake-up message to wake up the SEL-
351P.
The wake-up message is a character string matching the CHWAKE global setting (SET G
command; default is CHWAKE = ABCD). When the SEL-351P receives this character string,
the SEL-351P wakes up and resumes its protection and control functions. The wake-up message
feature is intended to be used with remote communication via a radio connected to the Wake-up
port. The SEL-351P includes a 12 Vdc output to supply a radio – see preceding subsection Keep
12 Vdc on While SEL-351P is “Asleep.” See the Introduction subsection and Table 10.1 in
Section 10: Serial Port Communications and Commands for more information on the Wake-up
port.
After the SEL-351P is awakened via the front-panel WAKE UP pushbutton, or the wake-up
message via the Wake-up port, the SEL-351P stays awake for 10 minutes after the last serial port
or front-panel port activity, unless the battery voltage falls below 70% of nominal, at which time
the SEL-351P puts itself to sleep again immediately, regardless of any other conditions.
Battery System Diagnostics
The SEL-351P monitors the 24 V battery system, including charge/discharge current, battery
voltage, and temperature. The SEL-351P calculates the capacity of the batteries based on these
measured values. The SEL-351P automatically applies a battery load test once per day and
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