Schweitzer Engineering Laboratories SEL-587Z - Example; Example 4.10 Close Logic SELOGIC Control Equation Settings

4.19
Date Code 20020903 SEL-587Z Instruction Manual
Control Logic
Close Logic (CL, ULCL, 52A, CFD)
EXAMPLE 4.10 Close Logic SELOGIC Control Equation Settings
See the SEL-587Z Settings Sheets in Section 5: Setting the Relay for
setting ranges.
SEL
OGIC control equation setting CL is set with local bit LB4. Local bit
LB4 closes directly (operates as a manual close switch via the front
panel). See Local Control Switches (NLBn, SLBn, CLBn, PLBn) on
page 4.5 and Section 8: Front-Panel Interface for more information
on local control.
CL = LB4 Close Condtions
SEL
OGIC control equation setting ULCL is set with the TRIP1 Relay
Word bit. This prevents the CLOSE Relay Word bit from being
asserted any time the TRIP Relay Word bit is asserted (TRIP takes
priority). See Trip Logic (TRn, ULTRn, TDURD) on page 4.16.
ULCL = TRIP1 Unlatch Close Conditions
SEL
OGIC control equation setting 52A is set with optoisolated input
IN1. Input IN1 is connected to a 52a circuit breaker auxiliary contact.
Setting 52A operates on 52a circuit breaker auxiliary contact logic.
When a closed circuit breaker condition is detected, the CLOSE Relay
Word bit is deasserted to logical 0. Setting 52A can handle a 52a or
52b circuit breaker auxiliary contact connected to an optoisolated
input (see Optoisolated Inputs on page 4.2 for more 52A setting
examples).
52A = IN1 Circuit Breaker Status
With setting CFD = 60.000 cycles, once the CLOSE Relay Word bit is
asserted, it can remain asserted at logical 1 for a maximum of
60 cycles.
If SEL
OGIC control equation setting 52A is set with numeral 0
(52A = 0), then the close logic is inoperable.
Route the result of the close logic in Figure 4.8 on page 4.18 to output
contact OUT2 with the following SEL
OGIC control equation:
OUT2 = CLOSE Output Contact OUT2