Binary Outputs; Leds - Siemens 7SR18 Solkor Manual

7SR18 Applications Guide
1.3

Binary Outputs

Binary Outputs are mapped to output functions by means of settings. These could be used to bring out such
digital signals as trips, a general pick-up, plant control signals etc.
All Binary Outputs are Trip rated.
Each can be defined as Self or Hand Reset. Self-reset contacts are applicable to most protection applications.
Hand-reset contacts are used where the output must remain active until the user expressly clears it e.g. in a
control scheme where the output must remain active until some external feature has correctly processed it.
Notes on Self Reset Outputs: -
With a failed breaker condition the relay may remain operated until current flow in the primary system is
interrupted by an upstream device. The relay will then reset and attempt to interrupt trip coil current flowing
through an output contact. Where this level is above the break rating of the output contact an auxiliary relay with
heavy-duty contacts should be utilised.
1.4

LEDs

In the Output Configuration menu LEDs can be mapped to output functions by means of settings. These could be
used to display such digital signals as trips, a general pick-up, plant control signals etc.
Each LED can be defined as Self or Hand Reset. Hand reset LEDs are used where the user is required to
expressly acknowledge the change in status e.g. critical operations such as trips or system failures. Self-reset
LEDs are used to display features which routinely change state, such as Circuit-Breaker open or close.
The status of hand reset LEDs is retained in capacitor-backed memory in the event of supply loss.
Each LED can be assigned as red, yellow or green in colour. There are two methods for doing this: -
1) In the LED Matrix tab, to assign the LED as a red colour select a box on the red row. To assign the
LED as a green colour select a box on the green row. To assign the LED as a yellow colour, select
boxes on both the red and green rows.
NB: If there are no boxes selected the LED will not illuminate.
2) In the OUTPUT CONFIG\LED CONFIG menu in the Settings tab, to assign the required LED as a
particular colour, either red or green, type the LED number in the appropriate row. To assign the
required LED as a yellow colour, type the LED number in both red and green rows.
NB: If a LED number is not assigned that particular LED will not illuminate.
Figure 1.4-2 LED configuration via the Settings \ OUTPUT CONFIG \ LED CONFIG menu
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Figure 1.4-1 LED configuration via the LED Matrix tab
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