The ATLAS Demand Control Logger receives consumption pulse signals from the site electricity meters. Each pulse represents 10 kVAh consumed.
The ATLAS logger records the consumption information into 30 minute integration periods and using the rate of pulses being received and consumption so far in each period, calculates an ongoing prediction of the Period Demand (KVA).
If the predicted period demand rises above the preset limit of 8500 kVA, the ATLAS logger begins to activate the 8 load shedding relays according to preset load shedding parameters.
The load shedding relays are connected to the PLC which monitors their status and adjusts its 4-20mA output signals as follows;