BE1-51/27C Tests and Adjustments
5-13
NOTE
For relays with two-phase-and-neutral or three-phase-and-neutral sensing (sensing
input types D, T, and J), perform Steps 10 through 15. Otherwise, the time over-
current pickup point calibration ends here (unless instantaneous 1 or 2 overcurrent
calibration is to be performed later in these procedures).
NOTE
The pickup point calibration ends here.
Step 4. Adjust the test voltage to 0 Vac and current to the desired time overcurrent pickup point for the
relay.
Step 5. Set the front panel
TAP
selector to the closest setting above the desired pickup point.
Step 6. Adjust the front panel
TAP CAL
control fully CW.
Step 7. Apply current to the relay.
Step 8. Slowly adjust the front panel
TAP CAL
Control CCW until the front panel
TIMING
indicator just
illuminates which indicates the desired time overcurrent pickup point for phase sensing. For relays
with two-phase-and-neutral, three-phase, or three-phase-and-neutral sensing, this pickup point will
be the same for all the phases.
Step 9. Remove input current.
Step 10. Reconnect the test set output to the neutral sense terminals. See Figures 5-3, 5-5, or 5-6.
Step 11. Adjust the current to the desired time overcurrent pickup point for the relay.
Step 12. Set the front panel
TAP (NEUTRAL)
selector to the closest setting above the desired pickup point.
Step 13. Rotate the front panel
CAL (NEUTRAL)
control fully CW.
Step 14. Slowly adjust the front panel
CAL (NEUTRAL)
Control CCW until the front panel
TIMING
(NEUTRAL)
indicator just illuminates to establish the desired time overcurrent pickup point for
neutral sensing.
Step 15. Remove input current.
Time Overcurrent Curve Selection (Timing Type Z1, Z2, and Z3 Only)
Step 1. Remove the relay case front cover to gain access to the logic board time overcurrent characteristic
curve selector.
Step 2. Remove the phillips-head screws from both side of the unit and remove the front panel. See
Figure 2-1 for the location of the logic board and curve selector.
Step 3. Select the desired curve. See Table 2-3 for the desired curve and selector position.
Step 4. Re-install the front panel and the front cover.
Summary of Contents for BE-51/27C
Page 1: ...0 1 2 3 4 5 67869 ABC DEF G 6H II GGJ KL M DEF DEK...
Page 16: ...BE1 51 27C Controls and Indicators 2 2 Figure 2 1 Location of Controls and Indicators...
Page 20: ...BE1 51 27C Controls and Indicators 2 6...
Page 22: ...BE1 51 27C Functional Description 3 2 Figure 3 2 Functional Block Diagram...
Page 32: ...BE1 51 27C Installation 4 7 Figure 4 10 Typical Internal Diagram Sensing Input Type L...