701 Motor Protection Relay Date Code 20010719
SEL
OGIC
®
Control Equations & Relay Logic
SEL
OGIC Control Equations
B.12
SELOGIC Control Equation Limitations
Each single SELOGIC control equation setting is limited to 25 Relay Word bits
that you can combine together with the SEL
OGIC control equation operators listed in
Table B.3 on page B.9. If you need to exceed this limit, use a nondedicated SELOGIC
control equation variable (SEL
OGIC control equation settings SV1 through SV4) to
combine terms and shorten the final equation.
The sum of SELOGIC control equation settings is limited to approximately 80
Relay Word bits that can be combined together using the operators listed in Ta bl e B .3.
SEL
OGIC control equation settings that are set directly to 1 (logical 1) or 0 (logical 0)
must be included in this sum of 80 Relay Word bits with each such setting counted as
one Relay Word bit.
As the relay saves its settings, it calculates the percentage of SEL
OGIC control
equation capability used. The relay reports this percentage as LEUSE = xx.x when the
settings are saved and when you execute the SHOW command. The LEUSE value
provides a measure of the relay SEL
OGIC control equation capability. The remainder
(100% – LEUSE) is available for future expansion.
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