ABB RELION 620 Series Technical Manual page 831

1MAC504801-IB E
Section 12
12.1
12.1.1
620 series ANSI
Technical Manual
General function block features
Definite time characteristics
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.
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.
A060764-ANSI V1 EN
Figure 420: Operation of the counter in drop-off
General function block features
Section 12
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