Figure 4-2 Various Pickup And Dropout Time Delay Counter Examples Of Operation - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

dropout time delay counter is used to delay the reset of the pickup timer if the protection variable
changes such as to cause the pickup signal to return to a false (logic zero) condition.
In the simplest case of operation, the protection variable exceeds the pickup level and remains
there. The pickup time delay counter would start counting until the value of the counter exceeds
the "pickup time delay" and a trip or alarm would be generated. The dropout time delay counter
has no involvement in this simplest type of operation. This case is shown in the top line of figure
Various Pickup and Dropout Time Delay Counter Various Examples of Operation for the cases
of latched and unlatched operation.
Figure 4-2 Various Pickup and Dropout Time Delay Counter Examples of Operation
The dropout time delay counter is used to reset the pickup time delay counter when the pickup
condition disappears. The second line of
Examples of Operation shows the case where the pickup signal goes to zero for a time greater
than the value of the dropout time delay. The dropout time delay is a programmable parameter
that is shown in figure
counter counts up once the pickup signal becomes false and resets the pickup time delay
counter.
Advanced Motor Protection for Variable Speed Operation
Manual, AA, A5E46373908A
Various Pickup and Dropout Time Delay Counter
Generalized Protection Function Block Diagram . The dropout time delay
Advanced Motor Protection Parameters
4.1 Standard Protections Block Diagram
19