3-16 Communications Date Code 970103
SEL-251, -2, -3 Instruction Manual
STATUS
STATUS allows inspection of self-test status. The relay automatically executes the STATUS
command whenever a self-test enters a warning or failure state. If this occurs, the relay transmits
a STATUS report from the port(s) designated automatic (see SET command, AUTO setting).
The STATUS report format appears below.
=>STATUS <ENTER>STATUS <ENTER>
Example 21.6 kV distribution feeder Date: 04/01/93 Time: 01:08:44
SELF TESTS
W=Warn F=Fail
IR IA IB IC VA VB VC
OS 0 0 0 0 2 0 2
PS 5.11 15.15 -14.91
RAM ROM A/D MOF SET
OK OK OK OK OK
=>
The OS row indicates measured dc offset voltages in millivolts for the seven analog channels.
An out-of-tolerance offset is indicated by a W (warning) or F (failure) following the displayed
offset value.
The PS row indicates power supply voltages in volts for the three power supply outputs.
If a RAM or ROM test fails, the IC socket code of the defective part replaces OK.
The A/D self-test checks analog-to-digital conversion time.
The MOF test checks dc offset in the MUX-PGA-A/D circuit.
The SET self-test calculates a checksum of the settings stored in nonvolatile memory and
compares it to the checksum calculated when the settings were last changed.
Section 2: Specifications provides full definitions of the self-tests, warning and failure limits,
and warning and failure results.
TARGET n k
TARGET selects the information to be displayed on the target LEDs and to be communicated by
this command.
When relay power is first turned on, the LED display indicates the functions marked on the front
panel.
Using the TARGET command, you may select any one of the following nine sets of data to
display on the LEDs.
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