Basler Electric BE1-51/27R - Manual (Page 16)

10 9137200999 Rev F
Table 4. Controls and Indicators
A Phase Tap Calibration Control. This single-turn potentiometer adjusts the phase overcurrent pickup
threshold between the selected phase tap setting and the next lower tap setting.
B Phase Tap Selector. Selects the phase overcurrent pickup point in conjunction with the front panel
Phase Tap Calibration Control (locator A).
C Phase Instantaneous 1 Control. This four-turn potentiometer adjusts the phase instantaneous 1
element trip setting over the range of 1 to 40 times the selected Phase Tap Selector (locator B)
setting value. Your relay may be equipped with a Phase Instantaneous 2 Control which provides
similar adjustment of the phase instantaneous 2 element trip setting.
D Phase Time Dial Selector. These two knobs set the time delay between sensing of a phase
overcurrent condition and closing of the output contacts. See the Time Overcurrent Characteristic
Curves chapter for curve selection information.
E Target Indicators. LED indicators latch on when the corresponding output relay is energized by an
overcurrent condition. Target indicators are reset by the Target Reset Switch (locator H).
F Push-to-Energize Output Pushbuttons. These recessed pushbuttons are depressed to energize the
external trip circuits for testing purposes. A thin, non-conducting rod should be used to depress the
buttons. Do not use a screwdriver.
G Tap Selector Table. This front-panel reference lists the high and low setting limits for a particular tap
selection.
H Target Reset Switch. Operating this switch resets all active targets (locator E).
I Power Indicator. This LED indicator lights when control power is applied and the relay power supply is
functioning.
J Timing Indicators. A Timing LED lights when the corresponding overcurrent pickup point is reached
and exceeded.
K Neutral Time Dial Selector. These two knobs set the time delay between sensing of a neutral
overcurrent condition and closing of the output contacts. See the Time Overcurrent Characteristic
Curves chapter for curve selection information.
L Neutral Tap Calibration Control. This single-turn potentiometer adjusts the phase overcurrent pickup
threshold between the selected neutral tap setting and the next lower tap setting.
M Neutral Tap Selector. Selects the neutral overcurrent pickup point in conjunction with the front panel
Neutral Tap Calibration Control (locator L).
N Neutral Instantaneous 1 Control. This four-turn potentiometer adjusts the neutral instantaneous 1
element trip setting over the range of 1 to 40 times the selected Neutral Tap Selector (locator M)
setting value.
The time overcurrent characteristic curve selector (not shown) is located on the left-side interior. This
circuit board mounted switch selects the characteristic curve to be used.
Prior to August 2010, this switch was located behind the front panel.
The normal/test slide switch (not shown) is located on the left-side interior. This switch is only used for
factory testing and must be in the normal position (towards front of relay) for proper operation.
Prior to August 2010, this switch was located on the right-side interior.
The tap range plate (not shown) indicates the terminal connections (high or low) used to select the current
sensing input range. The sensing input ranges are listed in Table 5.
Controls and Indicators BE1-51/27R