10-2 Maintenance Date Code 20010518
SEL-2020 Instruction Manual
5. Remove the battery from beneath the clip and install a new one. The positive side (+) of the
battery faces up.
6. Replace the front panel and front-panel screws and tighten securely.
7. Replace any cables removed from the SEL-2020.
8. Apply power to the SEL-2020, and set the date and time again. A battery failure will be
reported the first time you power-up with a new battery because the date and time reported
by the battery-backed clock will not be valid.
ALARM CONDITIONS
The SEL-2020 will assert the ALARM contact for a variety of conditions. It will also assert the
SALARM bit for a number of conditions. In SEL-2020 Communications Processors without I/O
boards, the ALARM contact will assert whenever the SALARM bit asserts. In units with I/O
boards, you will need to assign SALARM to an output contact, using SET G, if you want to
monitor these conditions. Table 10.1 lists the various conditions that cause ALARM contact and
SALARM operations.
Table 10.1: Alarm Conditions
Command or
Condition
Asserts
ALARM
Contact
Asserts
SALARM
Bit
Comment
2ACCESS if no I/O board Yes One second pulse when entering Access
Level 2 and if password is entered
incorrectly on three successive attempts.
ACCESS if no I/O board Yes One second pulse if password is entered
incorrectly on three successive attempts.
PASSWORD if no I/O board Yes One second pulse when password is
changed.
SET if no I/O board Yes One second pulse on settings change.
COPY if no I/O board Yes One second pulse on settings change.
SWAP if no I/O board Yes One second pulse on settings change.
Self-Test Failure Yes No Latches if SEL-2020 fails a self-test
(contact the factory).
Invalid Settings Yes No CVALID setting is set to No. Clear alarm
by setting CVALID to Yes using SET C.
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