7-20 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006
SEL-351 Instruction Manual
Another variation to the example application in Figure 7.15 and Figure 7.16 that adds more
security is a timer with pickup/dropout times set the same (see Figure 7.18 and Figure 7.19).
Suppose that SV6PU and SV6DO are both set to 300 cycles. Then the SV6T timer keeps the state
of latch bit LT1 from being able to be changed at a rate faster than once every 300 cycles
(5 seconds).
Figure 7.18: Latch Control Switch (With Time Delay Feedback) Controlled by a Single
Input to Enable/Disable Reclosing
Figure 7.19: Latch Control Switch (With Time Delay Feedback) Operation Time Line
Courtesy of NationalSwitchgear.com
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