The metrology module generates the following accumulated total quantities: ACC_T0,
ACC_T1, and ACC_T2.
Total accumulated quantities are specified by PCx_TYPE. They are used to save the
total accumulated energy. They are updated every full line cycle (20 ms for 50 Hz
and 16.667 ms for 60 Hz).
They are stored in the sQ33.30 format. Maximum ±8589934
KWh/KVarh/KAmp2h/KVAh can be stored in these quantities.
Before resetting the metrology firmware, the application must store present ACC_T0,
ACC_T1 and ACC_T2. After resetting the metrology firmware, the application must
restore ACC_T0, ACC_T1, and ACC_T2.
The ACC_Tx is stored in the sQ33.30 format.
Warning: Version 030400 improves the limits for
pulse accumulation. In previous versions, if the energy accumulated in a cycle
for any phase exceeded 0.5825 (Wh, VARh, Amp²-h, or VAh), the ACC_TX
accumulators and the pulse issue rate were incorrect. This limit corresponds to
125.8 kW at 60 Hz, which occurs with 1143.9A at 110V and a power factor of 1.
Version 030400 increases this limit by a factor of 1024.
