9190600990 Rev F
BE1-50BF Functional Description
3-3
Current Pickup Output
Each current pickup detector provides an input to the current pickup output. The current pickup output
provides an output to the logic if enabled by timer 1.
Pickup Settings
A front panel, multi-turn potentiometer sets the phase currents pickup thresholds. A second potentiometer
is provided to establish the neutral current pickup threshold.
Power Supply
Operating power for the relay circuitry is supplied by a wide range, electrically isolated, low-burden power
supply. Power supply operating power is not polarity sensitive. The front panel power LED and power
supply status output indicate when the power supply is operating. Power supply specifications are listed
in Table 1-1.
Power Supply Status Contacts
Power supply output contacts are monitored at the mother board. Normal supply voltage causes the
status relay to be continually energized. However, if at any time the voltage falls below requirements, the
relay drops out, and closes the normally closed contacts.
Target Indicators
Target indicators are optional components selected when a relay is ordered. The electronically latched
and reset targets consist of red LED indicators located on the relay front panel. A latched target is reset
by operating the target reset switch on the front panel. If relay operating power is lost, any illuminated
(latched) targets are extinguished. When relay operating power is restored, the previously latched targets
are restored to their latched state.
A relay can be equipped with either internally operated targets or current operated targets.
Internally Operated Targets
The relay trip outputs are directly applied to drive the appropriate target indicator. Each indicator is
illuminated regardless of the current level in the trip circuit.
Current Operated Targets
A current operated target is triggered by closure of the corresponding output contact and the presence of
at least 200 milliamperes of current flowing in the trip circuit.
NOTE
Prior to September 2007, BE1-50BF target indicators consisted of magnetically
latched, disc indicators. These mechanically latched target indicators have been
replaced by the electronically latched LED targets in use today.
Summary of Contents for BE1-50BF
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