ABB REG650 Technical Manual page 575

1MRK 502 048-UEN A
Technical manual
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Figure 270: Functional module diagram for calculating accumulative energy and
alarm
Accumulated energy calculator
This module calculates the accumulated energy I
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.
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Figure 271: 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 IACCL1 (L2, L3) are available through the
Monitored data view on the LHMI or through tools via communications. The values
can be reset by setting the Clear accum. breaking curr setting to on in the clear menu
from LHMI.
Section 14
Monitoring
y y
t [(kA) s]. The factor y is set with
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