ABB 615 series Technical Manual page 892

Section 7
Condition monitoring functions
886
A071109 V2 EN
Figure 460: Functional module diagram for calculating accumulative energy and
alarm
Accumulated energy calculator
This module calculates the accumulated energy I
Current exponent setting.
The calculation is initiated with the POSCLOSE input opening events. It ends when the
RMS current becomes lower than the Acc stop current setting value.
A071110 V1 EN
Figure 461: Significance of the Difference Cor time setting
The Difference Cor time 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 Difference Cor time setting. When the setting is negative, the calculation starts
in advance by the correction time before the auxiliary contact opens.
The accumulated energy outputs IPOW_A (_B, _C) are available in the monitored
data view on the LHMI or through tools via communications. The values can be reset by
setting the parameter Initial CB Rmn life setting to true in the clear menu from WHMI or
LHMI.
1MAC059074-MB A
y y
t [(kA) s]. The factor y is set with the
615 series ANSI
Technical Manual