7.4
SEL-351A Relay Instruction Manual Date Code 20080213
Inputs, Outputs, Timers, and Other Control Logic
Optoisolated Inputs
Input IN101 is indirectly used via the 52A Relay Word bit for other factory
settings [i.e., SEL
OGIC control equation settings BSYNCH (see Section 3:
Overcurrent, Voltage, Synchronism Check, and Frequency Elements), 79RIS
(see Section 6: Close and Reclose Logic), and DP2 (see Rotating Default
Display (Only on Models With LCD) on page 7.34)]. Using Relay Word bit
IN101 for the circuit breaker status setting 52A does not prevent using Relay
Word bit IN101 in other SEL
OGIC control equation settings.
Input IN102
Relay Word bit IN102 is used in the factory settings for the SELOGIC control
equation drive-to-lockout setting:
79DTL = !IN102 + ... [=NOT(IN102) + ...]
Connect input IN102 to a reclose enable switch.
When the reclose enable switch is open, input IN102 is de-energized and the
reclosing relay is driven to lockout:
79DTL = !IN102 + ... = NOT(IN102) + ... = NOT(logical 0) +... = logical 1
When the reclose enable switch is closed, input IN102 is energized and the
reclosing relay is enabled, if no other setting condition is driving the reclosing
relay to lockout:
79DTL = !IN102 + ... = NOT(IN102) + ... = NOT(logical 1) +...
= logical 0 + ...
See Section 6: Close and Reclose Logic for more information on SEL
OGIC
control equation setting 79DTL.
The pickup/dropout timer for input IN102 (IN102D) is set at:
IN102D = 0.50 cycles
to provide input energization/de-energization debounce.
Courtesy of NationalSwitchgear.com
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