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c. TARGET MODE (LAST-FAULT and PREVIOUS-FAULT)
NOTE:
d. TEST MODE
The test display mode provides diagnostic and testing capabilities for REL 301/
302. Relay status display, and relay output testing are among the functions pro-
vided.
Test Mode is selected by the SELECT push-button.
• Relay Self-Check Status
The REL 301/302 continuously performs self-checking. The results of the self-
check are represented by a hex value in the VALUE FIELD of the Status Function:
The results of the system self-check routines are accessible using the following pro-
cedure:
a. Depress the SELECT push-button until the TEST mode is displayed. Then, de-
b. The VALUE FIELD will display the status of the relay in hexadecimal Format.
(10/94)
To scroll through the metered data press the LOWER or RAISE push-buttons.
REL 301/302 saves the 16 latest fault records. See Table 4-3, page 4-19, for
complete listing. The L-FLT is the most recent fault, the P-FLT is the one prior
to the L-FLT. These two records can only be viewed from the front panel. All
other targets must be viewed through one of the remote communications in-
terfaces. They contain target information along with the frozen data at the time
of trip.
Zone 1 f
Trip on 1f AG
Inst f
They can be deleted by External Reset or through a remote communication in-
terface. The front panel RESET push-button resets the LEDs and sends the
display back to the metering mode.
As soon as a fault event is detected, the most recent two sets of target data are
available for display. If the setting Flt Data is set to Trip, the L-Flt is the data
associated with the most recent trip event. If a single fault occurs, the fault re-
lated LEDs blink. If reclosing is applied and the system trips again, the original
L-Flt information is transferred to the P-Flt memory. The latest trip informa-
tion is stored in the L-Flt memory and the L-Flt related LEDs double blink. If
Flt Data is set to Zone2, two events (Zone2 pickup and trip) will be stored. If
Flt Data is set to Zone2, Zone3, the two events will be either Zone2 pickup or
Zone3 pickup, and any type of trip.
All displayed Phase Angles use V
press the RAISE or LOWER key until the word status appears in the
FUNCTION FIELD.
L-FLT
P-FLT
Trip
as reference.
AG
I.L. 40-386.3
4-5
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