Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-17
SEL-351 Instruction Manual
Figure 7.16: Latch Control Switch Operation Time Line
Use a Remote Bit Instead to Enable/Disable the Reclosing Relay
Use a remote bit to enable/disable the reclosing relay, instead of an optoisolated input. For
example, substitute remote bit RB1 for optoisolated input IN4 in the settings accompanying
Figure 7.15:
SET1 = /RB1*!LT1 [= (rising edge of remote bit RB1) AND NOT(LT1)]
RST1 = /RB1*LT1 [= (rising edge of remote bit RB1) AND LT1]
79DTL = !LT1 [= NOT(LT1); drive-to-lockout setting]
Pulse remote bit RB1 to enable reclosing, pulse remote bit RB1 to disable reclosing, etc. – much
like the operation of optoisolated input IN4 in the previous example. Remote bits (Relay Word bits
RB1 through RB8) are operated through the serial port. See Figure 7.11 and Section 10: Serial
Port Communications and Commands for more information on remote bits.
These are just a few control logic examples — many variations are possible.
Courtesy of NationalSwitchgear.com
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