Event LEDs (113/213 Series)
Simple Level Signal
A typical Open ADR Signal has 2 parts:
- Event Notification
- Active Event
When the Utility decides to schedule a DR Event it usually scheduled sometime in advance. This could be as long as 24 hours or as short as 10 minutes depending on the contract.
As part of that contract, the Utility agrees to give Notice at a pre-agreed time. That Notice period could include an email, telephone call or other form of human to human communication.
The signal from the Utility Server (Virtual Top Node) also sends a Notice to the GRIDlink which is a time prior to the Active Event. It could be several hours or minutes. This is called a “Pending Notice” and is represented by DO1 illuminating.
DO1 represents a digital output to terminal 7 which can optionally energize a relay. This relay can be used to rotate a beacon or other alarm device or be used to pre-cool an area or some other strategy.
When the Event is Active, it can be a Moderate (DO2 – terminal 37) or High (DO3 – terminal 8) signal which controls the load to be shed.
The Moderate signal is not used by all Utilities but allows a lower level of load shed depending on how the relays are wired. It has also been used by some Utilities as a load “consume” logic as well.
DO4 indicates there is a connection to the Utility VTN.