6-12 Installation Date Code 20000421
SEL-251, -2, -3 Instruction Manual
nates. When the test is complete, type TAR R <ENTER> to reset and clear the front panel
target LEDs.
5. Proceed to Access Level 2 with the 2ACCESS command and second password. Be sure the
ALARM relay contacts close and open when the relay executes the 2ACCESS command.
The ALARM pulse will not be detectable if the ALARM contacts are closed due to an alarm
condition.
6. Test the TRIP output contacts by executing the OPEN command (The OPEN/CLOSE
command enable jumper JMP104 must be in place). The TRIP output contacts remain
asserted for at least the length of the TDUR (trip duration) setting and will not deassert until
all overcurrent elements in Relay Word row R1 drop out or you press the front panel
TARGET RESET button.
7. Test the CLOSE output contact by executing the CLOSE command (the OPEN/CLOSE
command enable jumper JMP104 must be in place). CLOSE output contact operation
requires that a 52A, !52A, 52AR, or !52AR function be assigned to an input (for example,
IN6=52A). With IN6 de-energized (circuit breaker open), execute the CLOSE command.
The CLOSE contacts remain asserted for as long as the CFT (close failure time) setting
unless the TRIP output contact is asserted or IN6 is energized (circuit breaker apparently
closed). If CFT = 0, CLOSE remains asserted indefinitely unless TRIP is asserted or IN6 is
energized (circuit breaker closed).
8. Test the programmable output contacts A1, A2, A3, and A4. Using the SET command, set
these contacts to assert when input IN5 is energized. IN5 is in Relay Word row R3 and
accessible by A1, A2, A3, and A4 output contact settings:
A1(1234) = IN5
A2(1234) = IN5
A3(1346) = IN5
A4(2346) = IN5
After entering the previous settings, apply nominal control voltage to input IN5 and observe
A1, A2, A3, and A4 output contact assertion.
9. Use the STATUS command to inspect the self-test status. You may wish to save the reading
as part of an as-left record.
When local checkout is complete, check communications with the instrument via a remote
interface (if used). Make sure the automatic port is properly assigned and that desired timeout
intervals are selected for each port. Also, be sure to record password settings.
To Next Page
Loading...
