The momentary use is the energy/ volume usage at this particular moment. The value can be converted to kW or m3/h, etc. The physical output "MomentaryUse" provides this value without respect of the engineering unit.
The calculation algorithm for the momentary use uses a sliding window with an interval time of MEU-01 seconds. The momentary energy use will be calculated as shown in the formula below:
MomentaryUse = (Number of pulses in interval)/ interval ∗ Multiplier * CNT-01
The minimum of the interval MEU-01 is 2 seconds * 72 = 144. For longer cycle times calculation of the momentary use is correct, only the sample interval increases.
The interval is MEU-01 in seconds if MEU-02 = 0 or MEU-01 in hours if MEU-02 = 1. The fewer pulses the meter delivers, the longer this time interval has to be made. The calculated value is the number of pulses per time unit (seconds/hours). This is the reason why the counted value is divided by the resulting time interval MEU-01 or MEU-01 * 3600.
The multiplier depends on the time unit of the currently used value:
To adjust the multiplier, you can set the value of the parameter MEU-02 as shown in the next table.
Table 1. MEU-02 Settings
Output engineering unit |
MEU-02 |
Multiplier |
Comment |
W, kW, l/sec |
0 |
1 |
All units per second |
m3/h |
1 |
3600 |
All units per hour |
In order to get the momentary consumption, the result is transmitted each minute to the output "MomentaryUse".
Table 2. Parameter List
Description |
Value Range |
Default Value |
Unit |
CNT-01: scaling factor |
1…100000 |
1 |
- |
MEU-01: time interval for momentary use calculation |
150…3600 |
300 |
sec |
MEU-02: time unit for momentary energy use; 0 = second; 1 = hour |
0 / 1 |
0 |
- |