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Appendix A
38
Encoding of Demand Calculation and History Data Save Interval
Register address 5005 is encoded as two 8-bit enumerated values, with demand calculation interval in the MSB and history data s
ave interval in
the LSB.
Max Demand sub-interval (MSB) defines the interval for calculation of maximum demand:
•
Each Max Demand data block has 3 sub-intervals in which demand is calculated.
•
Sub-intervals are 5 minutes for a 15 minute Max Demand block and 10 minutes for a 30 minute block.
For each sub-interval the total kWh consumption is divided by the number of accumulations to give average demand for the sub-in
terval.
Accumulations occur approximately every second.
0 = 5 minute sub- interval (15 minute Max Demand interval)
1 = 10 min sub-interval (30 minutes Max Demand interval)
Other values return an error
History interval (LSB) defines the interval for saving history data in EEPROM:
1 = 5 minute interval
3 = 15 minute interval
6 = 30 minute interval
12 = 60 minute interval
Other values return an error
When this register is read, the demand calculation interval appears in the MSB and history data save interval is in the LSB.
The method of writing to the register depends on the communication protocol. For Modbus R
TU, the demand calculation interval value is written to
the LSB and the history data save interval is fixed at 5 minutes and cannot be changed. For all other protocols, the demand calc
ulation interval value
is written to the MSB and the history data save interval value is written to the LSB.
WEB
VERSION
Содержание 3300 series
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