Schweitzer Engineering Laboratories SEL-351 - Page 513

Date Code 20001006 Testing and Troubleshooting 13-7
SEL-351 Instruction Manual
Self-Test Condition Limits
Protection
Disabled
ALARM
Output Description
+5 V REG Warning +4.75 V
+5.20,
-5.25 V
No Pulsed Measures the regulated
5 V power supply every
10 seconds.
Failure +4.50 V
+5.40,
-5.50 V
Yes Latched
+12 V PS Warning +11.50 V
+12.50 V
No Pulsed Measures the 12 V power
supply every 10 seconds.
Failure +11.20 V
+14.00 V
Yes Latched
+15 V PS Warning +14.40 V
+15.60 V
No Pulsed Measures the 15 V power
supply every 10 seconds.
Failure +14.00 V
+16.00 V
Yes Latched
TEMP Warning -40° C
+85° C
No Measures the temperature
at the A/D voltage
reference every 10
seconds.
Failure -50° C
+100° C
Yes Latched
RAM Failure Yes Latched Performs a read/write test
on system RAM every 60
seconds.
ROM Failure checksum Yes Latched Performs a checksum test
on the relay program
memory every 10
seconds.
A/D Failure Yes Latched Validates proper number
of conversions each 1/4
cycle.
CR_RAM Failure checksum Yes Latched Performs a checksum test
on the active copy of the
relay settings every 10
seconds.
EEPROM Failure checksum Yes Latched Performs a checksum test
on the nonvolatile copy
of the relay settings every
10 seconds.
Courtesy of NationalSwitchgear.com