Date Code 20090730 Instruction Manual SEL-734 Meter
Appendix D
Setting SELOGIC Control Equations
Overview
SELOGIC
®
control equations combine meter control elements with logic
operators to create custom control schemes. This appendix shows how to set
the control elements (Meter Word bits) in the SEL
OGIC control equations.
Additional SEL
OGIC control equation setting details are available in Section 9:
Settings (see also SEL-734 Settings Sheets). See the SHO Command (Show/
View Settings) on page 10.24 for a list of the factory settings shipped with the
standard SEL-734.
Meter Word Bits
Most of the control element logic outputs shown in the various figures in
Section 4: Metering through Section 9: Settings are Meter Word bits (labeled
as such in the figures). Each Meter Word bit has a label name and can be in
either of the following states:
1 (logical 1) or 0 (logical 0)
Logical 1 represents an element being picked up, timed out, or otherwise
asserted.
Logical 0 represents an element being dropped out or otherwise deasserted.
A complete listing of Meter Word bits and their descriptions are referenced in
Table 9.4.
Meter Word bits are used in SEL
OGIC control equations, which are explained
in SEL
OGIC Control Equations on page D.1.
SELOGIC Control Equations
Many of the control element logic inputs shown in the various figures in
Section 4: Metering through Section 9: Settings are SEL
OGIC control
equations (labeled SEL
OGIC Settings in most of the figures).
SEL
OGIC control equations are set with combinations of Meter Word bits to
accomplish such functions as the following:
➤ Use of optoisolated inputs to assign functions
➤ Operation of output contacts
Traditional or advanced custom schemes can be created with SEL
OGIC control
equations.
Courtesy of NationalSwitchgear.com
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