Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-5
SEL-351 Instruction Manual
Connect input IN1 to a 52a circuit breaker auxiliary contact.
If a 52b circuit breaker auxiliary contact is connected to input IN1, the setting is changed to:
52A = !IN1 [!IN1 = NOT(IN1)]
See Close Logic in Section 6: Close and Reclose Logic for more information on SELOGIC
Control Equation setting 52A.
The pickup/dropout timer for input IN1 (IN1D) is set at:
IN1D = 0.75 cycles
to provide input energization/deenergization debounce.
Input IN1 is indirectly used in other factory settings as 52A [i.e., SELOGIC Control Equation
settings BSYNCH (see Section 3: Overcurrent, Voltage, Synchronism Check, Frequency, and
Power Elements), 79RIS (see Section 6: Close and Reclose Logic), and DP2 (see Rotating
Default Displays at the end of this section)]. Using Relay Word bit IN1 for the circuit breaker
status setting 52A does not prevent using Relay Word bit IN1 in other SELOGIC Control Equation
settings.
Input IN2
Relay Word bit IN2 is used in the factory settings for the SELOGIC Control Equation drive-to-
lockout setting:
79DTL = !IN2 + ... [=NOT(IN2) + ...]
Connect input IN2 to a reclose enable switch.
When the reclose enable switch is open, input IN2 is deenergized and the reclosing relay is driven
to lockout:
79DTL = !IN2 + ... = NOT(IN2) + ... = NOT(logical 0) +... = logical 1
When the reclose enable switch is closed, input IN2 is energized and the reclosing relay is enabled,
if no other setting condition is driving the reclosing relay to lockout:
79DTL = !IN2 + ... = NOT(IN2) + ... = NOT(logical 1) +... = logical 0 + ...
See Section 6: Close and Reclose Logic for more information on SELOGIC Control Equation
setting 79DTL.
Input IN2 is also used in the factory setting DP1 (see Rotating Default Displays at the end of this
section).
The pickup/dropout timer for input IN2 (IN2D) is set at:
IN2D = 1.00 cycle
to provide input energization/deenergization debounce.
Courtesy of NationalSwitchgear.com
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