9137200997 Rev D
BE1-51 Tests and Adjustments
5-9
(d)
Sensing Input Types H or V:
Refer to Figure 5-3. Because the relay front panel
TIMING
indicator provides the needed pickup indication, do not connect the test setup to the output
terminals. The front panel
TAP
selector is ganged and the adjustment of one input phase
automatically aligns the others, thus, only one set of current sense terminals need be
connected. For adjustment of the front panel
TAP (NEUTRAL)
selector, the relay is
reconnected for neutral sensing by this procedure.
Step 2.
Remove the relay front cover.
Step 3.
Sensing Input Types G, I, K, or X.
Verify that the front panel
TAP RANGE
plate is installed and
the correct range (HIGH or LOW) is visible.
Step 4.
Adjust the test 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 or 5-4.
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 cradle front cover to gain access to the logic board time overcurrent
characteristic curve selector.
Step 2.
Remove the Phillips screws from both sides 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 A-2 for the desired curve and selector position.
Step 4.
Re-install the front panel and the front cover.
NOTE
For relays with two-phase-and-neutral or three-phase-and-neutral sensing
(Sensing Input Types I or V), perform Steps 10 through 15. Otherwise, the time
overcurrent pickup point calibration ends here (unless instantaneous 1 or 2
overcurrent calibration is to be performed later in these procedures).
NOTE
Pickup point calibration ends here.