Accumula-
ted energy
calculator
POSCLOSE
IACCRST
BLOCK
BLK_ALM
Alarm limit
check
IACCLOAL
IACCALM
I3P
I_A
I_B
I_C
GUID-DAC3746F-DFBF-4186-A99D-1D972578D32A-ANSI V1 EN
Figure 236: Functional module diagram for calculating accumulative energy and
alarm
Accumulated energy calculator
This module calculates the accumulated energy I
y
t [(kA)
y
s]. The factor y is set with the
CurrExp setting.
The calculation is initiated with the POSCLOSE input open events. It ends when the RMS
current becomes lower than the AccDisLevel setting value.
GUID-75502A39-4835-4F43-A7ED-A80DC7C1DFA2 V1 EN
Figure 237: Significance of theDiffTimeCorr setting
The DiffTimeCorr setting is used instead of the auxiliary contact to accumulate the energy
from the time the main contact opens. If the setting is positive, the calculation of energy
starts after the auxiliary contact has opened and when the delay is equal to the value set
with the DiffTimeCorr setting. When the setting is negative, the calculation starts in
advance by the correction time before the auxiliary contact opens.
The accumulated energy outputs IACC_A (_B, _C) are available through the
Monitored data view on the LHMI or through tools via communications. The values can
Section 12 1MRK 511 287-UUS A
Monitoring
534
Technical manual
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