7.5
Date Code 20060320 Instruction Manual SEL-311C Relay
Inputs, Outputs, Timers, and Other Control Logic
Optoisolated Inputs
Optoisolated inputs IN101āIN106 receive their function by how their
corresponding Relay Word bits IN101 through IN106 are used in SEL
OGIC
control equations.
Settings Example 1
Figure 7.3 Circuit Breaker Auxiliary Contact and
Reclose Enable Switch Connected to Optoisolated Inputs IN101 and IN102
The functions for inputs IN101 and IN102 (Figure 7.3) are described in the
following discussions.
Input IN101
Relay Word bit IN101 (Figure 7.3) is used in the settings for the SELOGIC
control equation circuit breaker status setting:
52A = IN101
Connect input IN101 to a 52a circuit breaker auxiliary contact.
If a 52b circuit breaker auxiliary contact is connected to input IN101, the setting
is changed to:
52A = !IN101 [!IN101 = NOT(IN101)]
See Close Logic on page 6.2 for more information on SEL
OGIC control
equation setting 52A.
The pickup/dropout timer for input IN101 (IN101D) might be set at:
IN101D = 0.75 cycles
to provide input energization/de-energization debounce.
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 (Figure 7.3) is used in the 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:
79
Enable
52a
SEL-311C
(+)
IN102
(ā)
IN101
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