Basler Electric BE1-50/51B-240 - Manual (Page 17)

9252000790 Rev B 9
Figure 5. Circuit Board Controls
Table 3. 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
(50) target indicators. Jumper J1 sets the minimum current range for the 50 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. When the jumper is installed across
pins 1 & 2, the targets must operate
≥ 2.25 A and must not operate < 900 mA. When the
jumper is installed across pins 2 & 3, the targets must operate ≥ 200 mA and must not
operate < 80 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 (50) element.
The ON position provides an additional delay of 100 milliseconds.
SW3-3 selects either GE IAC or Westinghouse CO type characteristic curves. The ON
position selects the GE IAC type curves (listed in Table 4) and the OFF position selects the
Westinghouse CO type curves (listed in Table 5).
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.
BE1-50/51B-240 Controls and Indicators