2-4
BE1-50/51B-235/-236 Controls and Indicators
9252000898 Rev —
Table 2-2. Circuit Board Controls
Locator Description
A
Target Operating Current Jumpers.
Two user-adjustable jumpers control the range of trip
circuit current required to operate the time overcurrent (51) and instantaneous overcurrent
A (50-A) target indicators. Jumper J1 sets the minimum current range for the 50-A target
indicator and J2 sets the minimum current range for the 51 target indicator. Two jumper
positions are possible: across pins 1 and 2 or across pins 2 and 3. Installing a jumper
across pins 1 and 2 gives a minimum operating current of 0.9 to 2.25 A. Installing a jumper
across pins 2 and 3 gives a minimum operating current of 80 to 200 mA.
B
Four Position Slide Switch.
This switch assembly, designated SW3, has four independent
slide switches designated SW3-1, SW3-2, SW3-3, and SW3-4. Each switch functions as
follows:
SW3-1 selects the nominal system frequency. The OFF position selects 60 Hz operation
and the ON position selects 50 Hz operation.
SW3-2 provides an additional time delay for the instantaneous overcurrent A (50-A)
element. The ON position provides an additional delay of 100 milliseconds.
SW3-3 selects either GE IAC or ABB type characteristic curves. The ON position selects
the GE IAC type curves (listed in Table A-1) and the OFF position selects the ABB type
curves (listed in Table A-2).
SW3-4 selects either an instantaneous or integrating time reset characteristic. The ON
position selects an integrating reset characteristic and the OFF position selects an
instantaneous reset characteristic.
C
Instantaneous Overcurrent B Pickup Selector Switches.
These two screwdriver-adjusted,
rotary switches select the instantaneous overcurrent B (50-B) pickup current setting in
amperes.
The 50-B pickup switches are accessed on the top side of the draw-out assembly by
removing the draw-out assembly from the case.
BE1-50/51B-235
The left-hand switch (SW9) is a 16-position switch that sets the units portion (#.#) of the 50-
B pickup setting in amperes. SW9 setting positions consist of 0 through 9 which correspond
to values of 0 to 9 amperes and A through F which correspond to values of 10 to 15
amperes. The right-hand switch (SW10) is a 10-position switch that sets the tenths portion
(#.#) of the 50-B pickup setting in amperes. SW10 setting positions consist of 0 through 9
which correspond to values of 0.0 to 0.9 amperes.
The minimum allowable 50-B pickup setting is 1.0 Aac and the maximum allowable 50-B
pickup setting is 15.9 Aac. Adjusting the 50-B pickup selector switches while the relay is in
service may cause the relay to trip.
Example: SW9 position 2 and SW10 position 5 is a setting of 2.5 Aac.
BE1-50/51B-236
The total pickup setting is the sum of two settings. The first setting, SW9 has a range of 0.2
to 3.0 corresponding to switch position 1 through F. The second setting, SW10 has a range
of 0.02 to 0.18 corresponding to switch position 1 through 9.
The minimum allowable 50-B pickup setting is 0.2 Aac and the maximum allowable 50-B
pickup setting is 3.18 Aac. Adjusting the 50-B pickup selector switches while the relay is in
service may cause the relay to trip.
Example: SW9 position 2 and SW10 position 5 is a setting of 0.5 Aac.
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