Basler Electric BE1-47N - Manual (Page 23)

9170400990 Rev J BE1-47N Functional Description 3-7
Power Supply Status Output
The power supply status relay has a set of normally closed contacts and energizes when operating power
is applied to the BE1-47N. If relay operating power is lost or either side of the power supply output (+12
Vdc or –12 Vdc) fails, the power supply status relay de-energizes and opens the power supply status
output contacts.
Indicators
LEDs indicate power supply status and protection function pickup.
The power LED lights when operating power is applied to the relay and the relay power supply is
operating normally.
One LED is provided for each protection function. An LED lights when the function’s setpoint is exceeded
and the protection function is timing toward a trip.
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.
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.
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.
Internally Operated Targets
A current operated target is triggered by closure of the corresponding output contact
Current Operated Targets
and the presence of
at least 200 milliamperes of current flowing in the trip circuit.
NOTE
Prior to September 2007, BE1-47N 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been replaced by the electronically latched LED targets in use today.