ABB REL300 Instruction Manual page 102

through the REL300 values available for the particular function. (Each value that appears, as
each different function appears in the function field, is considered to be the "current value" used
for that particular function.)
In order to change the "current value" of a particular settings function, "RAISE" or "LOWER" the
FUNCTION field until the desired function appears (e.g., "RP"). Then "RAISE" or "LOWER" the
values in the VALUE field until the desired value appears. If the "ENTER" pushbutton (recessed
for security purposes) is depressed, the value which appears in the VALUE field will replace
the "current value" in memory; but only if the "VALUE ACCEPTED" LED flashes once to indi-
cate that the value has been successfully entered into the system.
For reasons of security, a plastic screw is used to cover the ENTER pushbutton. A wire can be
used to lock the plastic screw and to prevent any unauthorized personnel from changing the
settings.
4.5.2 Metering (Volts/Amps/Angle) Mode
When the Volts/Amps/Angle LED is selected by the "Display Select" pushbutton, the phase A,
B, C voltages, currents and phase angles are available for on-line display during normal oper-
ation. All measured values can be shown by scrolling the "Raise" or "Lower" pushbutton in the
FUNCTION field. The values on the display are dependent on the settings of RP (read primary);
RP= YES for the primary side values and RP = NO for the secondary values. Conditions such
as loss-of-potential, loss-of-current and out-of-step blocking can also be monitored. The func-
tion names and values are shown in Table 4-2, page 4-19.
NOTE: All displayed Phase Angles use V
The phase rotation of ABC or ACB is also displayed on the metering mode depends on
the setting of JMP3 position on processor module.
4.5.3 Target (Last and Previous Fault) Mode
The REL300 system saves the latest 16 faults records. The "LAST FAULT" information is of the
most recent fault, the "PREVIOUS FAULT" information is of the fault prior to the "LAST FAULT".
These displays contain the target information along with the "frozen" data at the time of trip.
The "LAST FAULT" register shows one or two records stored by flashing the LED once or twice
per second, respectively. These records can be deleted by External Reset voltage TB/5 (+) and
TB5/6 (-) or through a remote communication interface. The front panel (RESET) pushbutton
allows the user to reset the flashing LED to Metering position only. It will not erase the fault in
formation.
Different types of faults with related descriptions are shown in Table 4-3, page 4-20. As soon
as a fault event is detected, the most recent two sets of target data are available for display. If
the FDAT is set at "TRIP", the "Last Fault" is the data associated with the most recent trip event.
The "Previous Fault" contains the data from the prior trip event. If a single fault occurs, the "Last
Fault" LED flashes. If a reclosing is applied and the system trips, the original "LAST FAULT"
information will be transferred to the "Previous Fault" memory. The latest trip information will
be stored in the "Last Fault" memory, and its LED flashes twice per second. If FDAT is set at
Z2TR, two events (Zone 2 pickup or trip) will be stored. If FDAT is set at Z2/Z3, the two events
will be either Zone 2 pickup or Zone 3 pickup or any type of trip. The same description applies
to a remote communication which can store up to 16 events.
as reference.
A
I.L. 40-385.7
4-5