Basler Electric BE1-81O/U - Manual (Page 17)

9137300990 Rev N 11
Relay Outputs
The time delay logic output for each setpoint energizes an associated output relay that is normally open
(output type E) or normally closed (output type G). The relay output type specified is the same for each
setpoint included in the relay.
Auxiliary Relay Outputs
An auxiliary relay may be specified that is energized simultaneously with the output relay. The relay
contacts are either normally open (option 3-1) or normally closed (option 3-2). When specified, this option
is included for each setpoint and is the same contact type for all setpoints within a relay.
Power Supply
BE1-81O/U internal circuitry is powered by one of three wide-range power supplies. Power supply voltage
ratings are listed in the Specifications chapter.
Relay operating power is developed by the wide-range, isolated, low-burden, flyback-switching power
supply. Input power (source voltage) for the power supply is not polarity sensitive. The front-panel Power
Indicator lights to indicate that the power supply is functioning properly.
Power Supply Status Output
The optional power supply status output relay (option 2-S) has a set of normally closed contacts that are
energized open during normal operation. If the power supply output fails (or operating power is removed
from the relay), the power supply status output relay de-energizes and the contacts close.
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.
BE1-81O/U Functional Description