BE1-47N Human-Machine Interface (Controls and Indicators)
2-1
SECTION 2 • HUMAN-MACHINE INTERFACE
(CONTROLS AND INDICATORS)
The following table is referenced to Figure 2-1.
LOCATOR
CONTROL OR INDICATOR
FUNCTION
A
NEGATIVE SEQUENCE PICKUP
Sixteen-position thumbwheel switch which
provides adjustment of voltage pickup point
over the range of 2 to 32% of the nominal
voltage, in increments of 2%. Settings
correspond to percentage levels as indicated
on the front panel.
B
NEGATIVE SEQUENCE
Red LED turns ON when level of NEGATIVE
SEQUENCE voltage exceeds pickup setting.
C
NEGATIVE SEQUENCE TIME
DELAY
Thumbwheel switch provides adjustment of
the inverse, definite or instantaneous TIME
DELAY for the Negative Sequence Voltage
function (See Specifications for ranges and
accuracies.)
D
POWER Indicator
Red LED turns ON when operating power for
internal circuitry is provided.
E
UNDERVOLTAGE PICKUP
Sixteen-position thumbwheel switch that
provides adjustment of the
UNDERVOLTAGE PICKUP point, from 2 to
32% below nominal in increments of 2%.
Settings correspond to percentage levels as
indicated on the front panel.
F
UNDERVOLTAGE Indicator
Red LED turns ON when system voltage falls
below UNDERVOLTAGE pickup setting.
G
UNDERVOLTAGE TIME DELAY
Thumbwheel switch provides adjustment of
inverse, definite, or instantaneous TIME
DELAY for the Undervoltage function (See
Specifications for ranges and accuracies.)
H
Target Reset Lever
Provides manual reset of target indicators.
I
27/59 Target Indicator
Red target indicates when overvoltage or
undervoltage output relay has energized.
Must be manually reset.
J
PUSH-TO-ENERGIZE
Pushbuttons
Provides manual energization of the output
relays by insertion of a 1/8 inch non-
conduction rod through the access hole in the
front panel; for testing the external trip circuit.
K
47N Target Indicator
Red target indicates when negative
sequence voltage output relay has energized.
Must be manually reset.
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