Power and Energy¶

Power and Energy is a tab for setting the power and energy monitored by energy meters with pulse output or measuring current and voltage from sensors connected to the analog inputs INPA1 - INPA6.

Page elements¶

Section with readings and configuration of power and energy measurement. Since version HW 3.5+ SW 1.49d there are 6, previously there were 4.

Includes:
- name setting
- power and energy readings
- changing the unit of measurement (added in HW 3.5+ SW 1.22c)
  Impact of the unit of measurement option on power and energy values
  
  Selecting this option can affect the displayed power value and energy accumulation. The impact varies depending on the selected measurement inputs (I and U):
  I = INPAX and U = INPAX or constant voltage
  
  Select W or kW - the power value is converted (e.g., 0.8 kW or 800 W).
  The selection does not affect energy accumulation.
  
  I = INPDX and U inactive
  
  Select from W, l/min, and m3/h - the power value remains the same in each case but is valid only for W.
  The selection does not affect energy accumulation.
  
  I = mX and U inactive
  Select from W, kW, kW -> W, and W -> kW.
  
  kW - the value from variable mX is treated as power in kW.
  
  W - the value from variable mX is treated as power in W.
  
  kW -> W - the value from variable mX is treated as power in kW but displayed as power in W (numerical value multiplied by 1000).
  
  W -> kW - the value from variable mX is treated as power in W but displayed as power in kW (numerical value divided by 1000).
  
  Energy is calculated based on how the mX variable is treated (W or kW); depending on the selection, the accumulation rate differs by a factor of 1,000 (the energy unit is always kWh).
- selecting measurement inputs
  
  Input selection and energy measurement
  
  Energy is calculated in three ways depending on the selected inputs:
  
  I = INPAX and U = INPAX or constant voltage
  
  Calculated based on I and U components, then accumulated over time.
  
  I = INPDX and U inactive
  
  Pulse counting and conversion to energy based on a specific factor. Changing the factor alters the accumulated energy value, as the system stores a pulse count that is scaled by that factor.
  
  I = mX and U inactive
  
  The value is treated as power and then accumulated over time — just like the result based on I and U components in the first case.
  
  The pulse count is stored in a variable separate from the accumulated energy value; consequently, changing the input setting from INPDX to another (or vice versa) may result in a change to the energy value.
- setting the pulse-to-unit conversion factor
- field for entering a new state of energy measurement
- enabling energy counting (added in HW 3.5+ SW 1.49d)
Function of storing readings - when selected, LK periodically saves energy values and restores them after a restart.

Setting the energy value

The energy reading in the field will only change when the Count energy option is turned on. Therefore, before setting a new state of energy, it is worth activating this option beforehand. Otherwise, the set value will appear in the readout field only after activating Count energy.

Measurement with counter with pulse output¶

To the logic input INPD1 - INPD4 connect + (plus) the pulse output of the meter, to GND - (minus) from the counter. Then in the drop-down menu select the input INPD1 - INPD4 to which the counter is connected, and in the field below enter the number of pulses for 1 kWh.

Measurement with analogue current and voltage sensors¶

From the left menu, select the INPA input to which the current sensor is connected, and in the right menu select the voltage input (sensor). In the case of measuring AC current with the SCT transconductors can be used to select the approximate voltage value in the electrical network.