Basler BE-51/27C, Instruction Manual, Page: 15 / 53

2-1
!"#$%&'()
!"#$%"&'()#*(+#*+!)$"%'
GENERAL
Table 2-1 lists and briefly describes the operator controls and indicators of the BE1-51/27C Time
Overcurrent Relay with voltage control. Reference the call-out letters to Figure 2-1.
Table 2-1. Controls and Indicators
Letter Control or Indicator Function or Indicator
A
TAP NEUTRAL
Selector Provides selection of the neutral overcurrent pickup
point in conjunction with the front panel
NEUTRAL
CAL
control.
B PHASE - TAP Selector Provides the selection of the overcurrent pickup point
in conjunction with the front panel
TAP CAL control.
C CAL NEUTRAL Control (On
Relays with Phase-and-
Neutral Sensing Only)
A single turn potentiometer provides adjustment of the
neutral overcurrent pickup point between the selected
tap setting and the next lower tap setting.
Not
Shown
TAP RANGE
Plate High/Low Plate position indicates the terminal connections (high
or low) used to select the current sensing input range.
Refer to Table 2-2 for sensing input ranges.
D
TIME DIAL NEUTRAL
(If
present)
Determines the time delay between sensing of the
overcurrent condition and the closing of the output
relay. Refer to Section 1 and Table 2-3 for curve
selection information.
E TIMING NEUTRAL (If pres-
ent)
LED illuminates when the neutral pre-set overcurrent
pickup point is reached and exceeded.
F Time Current Characteristic
Curve Selector (Z1, Z2, and
Z3 Timing Options Only) Provides selection of the time current characteristic
curves. Refer to Section 1 and Table 2-3 for curve
selection information. Cutaway view shows switch
behind the front panel.
G
POWER
Indicator LED illuminates to indicate that the relay power
supply is functioning.
H Target Reset Lever Manually resets all targets (both element and function
type).
I FUNCTION Targets TIME
INST1, INST2 *
Front panel FUNCTION targets trip when the
corresponding output relay is energized by an
overcurrent condition.
J ELEMENT Targets Front panel ELEMENT targets trip when an output
relay is energized by an overcurrent condition.