Deif MIB 8000 - Reactive Energy (Eq) Measurement; Apparent Energy (Es) Measurement; Maximum Demand Calculation

where Rx = register value.
6.2.8 Reactive energy (Eq)
The reactive energy is the time integral of reactive power, and the unit is kVArh. Import of reactive energy is equal to inductive
reactive energy, and is positive. Export of reactive energy is equal to capacitive reactive energy and is negative.
You can see the reactive energy counters on the display. You can also view the values remotely using RS485 communication and
MIBLink, the MIB utility software.
If you use Modbus to collect the reactive energy data, you need to use this equation to calculate the values:
where Rx = register value.
6.2.9 Apparent energy (Es)
The apparent energy is the time integral of apparent power, and the unit is kVAh. You can see the apparent energy counter on the
display. You can also view the values remotely using RS485 communication and MIBLink, the MIB utility software.
If you use Modbus to collect the apparent energy data, you need to use this equation to calculate the apparent energy values:
where Rx = register value.
6.2.10 Maximum demand
You can view the demand values of power, reactive power, and apparent power on the MIB. The MIB uses the method of sliding
window statistics to calculate the demand values. In this method, a window of specified length, moves over the data, sample by
sample, and the statistic is computed for the data in the window. You can set the length of the window sliding time to be between 1
to 30 minutes. The window slides one minute each time. The MIB always calculates the average demand every minute. If the time is
set to 3 minutes, then the MIB uses the remaining 3 minutes to calculate the average demand.
You can see the demand values on the display. You can also view the values remotely using RS485 or MIBLink, the MIB utility
software.
If you use Modbus to collect the demand data, you need to use these equations to calculate the demand values:
Power (P)
where Rx = register value, CT1 and CT2 = current transformer data, and PT1 and PT2 = voltage transformer data.
Reactive power (Q)
DESIGNER'S HANDBOOK 4189320063D EN Page 19 of 23