1MAC309294-MB F Section 10
General function block features
RER620 459
Technical Manual
Section 10 General function block features
10.1 Definite time characteristics
10.1.1 Definite time operation
The DT mode is enabled when the Operating curve type setting is selected either as “ANSI
Def. Time” or “IEC Def. Time”. In the DT mode, the TRIP output of the function is
activated when the time calculation exceeds the set Trip delay time.
The user can determine the reset in the DT mode with the Reset delay time setting, which
provides the delayed reset property when needed.
Figure 238: Operation of the counter in drop-off
In case 1, the reset is delayed with the Reset delay time setting and in case 2, the counter
is reset immediately, because the Reset delay time setting is set to zero.
The Type of reset curve setting has no effect on the reset method when the
DT mode is selected, but the reset is determined solely with the Reset delay
time setting.
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