Date Code 20010625
Inputs, Outputs, Timers, and Other Control Logic
7-13
SEL-311L Instruction Manual
Latch Control Switch Application Ideas
Latch control switches can be used for such applications as:
v
Reclosing relay enable/disable
v
Ground relay enable/disable
Latch control switches can be applied to almost any control scheme. The following is an
example of using a latch control switch to enable/disable the reclosing relay in the SEL-311L
Relay.
Reclosing Relay Enable/Disable Setting Example
Use a latch control switch to enable/disable the reclosing relay in the SEL-311L Relay. In this
example, a SCADA contact is connected to optoisolated input IN104. Each pulse of the SCADA
contact changes the state of the reclosing relay. The SCADA contact is not maintained, just
pulsed to enable/disable the reclosing relay.
Figure 7.12: SCADA Contact Pulses Input IN104 to Enable/Disable Reclosing Relay
If the reclosing relay is enabled and the SCADA contact is pulsed, the reclosing relay is then
disabled. If the SCADA contact is pulsed again, the reclosing relay is enabled again. The
control operates in a cyclic manner:
pulse to enable ... pulse to disable ... pulse to enable ... pulse to disable ...
This reclosing relay logic is implemented in the following SEL
OGIC
control equation settings
SET1 = /IN104 * !LT1
[= (rising edge of input IN104) AND NOT(LT1)]
RST1 = /IN104 * LT1
[= (rising edge of input IN104) AND LT1]
79DTL = !LT1
[= NOT(LT1); drive-to-lockout setting]
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