Date Code 990215 Testing and Troubleshooting 13-7
SEL-351P Manual Técnico
Self-Test
Condition
Limits
Protection
Disabled
ALARM
Output
Description
The following self-tests are performed by dedicated circuitry in the microprocessor and the
SEL-351P main board. Failures in these tests shut down the microprocessor and are not shown
in the STATUS report.
Micro-
processor
Crystal
Failure Yes Latched The SEL-351P monitors
the microprocessor
crystal. If the crystal
fails, the relay displays
“CLOCK STOPPED” on
the LCD display. The
test runs continuously.
Micro-
processor
(main circuit
board)
Failure Yes Latched The microprocessor on
the main circuit board
examines each program
instruction, memory
access, and interrupt.
The SEL-351P displays
“VECTOR nn” on the
LCD upon detection of an
invalid instruction,
memory access, or
spurious interrupt. The
test runs continuously.
Micro-
processor
(battery
charging/
power
supply
board)
Warning No Pulsed The microprocessor on
the battery
charging/power supply
circuit board reports a
MODE failure in the
status report if a
processing error occurs.
+5V PSBC Warning +4.75 V
+5.20 V
No Pulsed Measures the +5 V power
supply on the battery
charger board every 10
seconds.
Aux +12 V Warning 0 (if AUX
power is
set to
OFF)
+11.20 V
+14.00 V
No Pulsed Measures the +12 V
power supply on the
AUX port (if AUX power
is set to ON) every 10
seconds.
Battery
Voltage
Warning 18.00 V
45.00 V
No Pulsed Measures battery voltage
every 10 seconds.
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