Basler Electric BE1-51/27C - Manual (Page 54)

48 9137200998 Rev E
Step 9. On the appropriate time overcurrent curve chart (in the Time Overcurrent Characteristic Curves
chapter), locate the line representing 5 times the tap value (from Step 5) where it intersects the
particular curve representing the front panel TIME DIAL setting of 20 (from Step 4). The
resulting time delay value in seconds should be within
±5% of the timer reading [from Step
7(2)].
Step 10. Adjust the front panel TIME DIAL to 40, 60, and 99, each time repeating Steps 6 through 9.
Note
For relays having two-phase-and-neutral, three-phase, or three-phase-
and-neutral sensing (Sensing Input Types A, D, P, T, or J) it is not
necessary to repeat this test for the remaining phases.
For relays having two-phase-and-neutral, or three-phase-and-neutral
sensing (Sensing Input Types D, T, or J) perform Steps 11 through 20.
For relays having single-phase or three-phase sensing (Sensing Input
Types A or P) with instantaneous overcurrent option 1-1 or 1-2,
proceed to the instantaneous overcurrent test.
Step 11. Remove the power and reconnect the test output to the neutral current sensing input of the
relay as shown in Figures 32 and 34 (terminals 17 and 18).
Step 12. Set the front panel TAP (NEUTRAL) selector to B.
Step 13. Rotate the front panel CAL (NEUTRAL) control fully CW.
Step 14. Rotate the front panel TIME DIAL (NEUTRAL) to 20.
Step 15. Ensure that all relay targets have been reset.
Step 16. Adjust the test set for an overcurrent threshold of precisely 5 times the front panel TAP
(NEUTRAL) selector B setting as measured by the ammeter.
Step 17. Apply input current to the relay and initiate the test setup timer.
RESULTS: Observe that the appropriate front panel TIMING (NEUTRAL) indicator illuminates.
Step 18. When the time delay ends, the timed output relay is energized.
RESULTS: (1) The front panel TIMING (NEUTRAL) indicator extinguishes.
(2) The test setup timer stops. (Record count for use in Step 20.)
(3) If target Type A or B is present:
(a) Front panel FUNCTION-TIME target (if present) trips.
(b) Appropriate front panel ELEMENT target A, B, or C (if present) trips.
Step 19. Remove input current and (if present) reset the relay front panel targets.
Step 20. On the appropriate time overcurrent curve chart (in the Time Overcurrent Characteristic Curves
chapter), locate the line representing 5 times the tap value (from Step 5) where it intersects the
particular curve representing the front panel TIME DIAL (NEUTRAL) setting of 20 (from Step
14). The resulting time delay value in seconds should be within
±5% of the timer reading [from
step 18(2)].
Tests and Adjustments BE1-51/27C