H.9
Date Code 20060320 Instruction Manual SEL-311C Relay
Setting SELOGIC Control Equations
SEL
OGIC Control Equations
SELOGIC Control
Equation Limitations
Any single SELOGIC control equation setting is limited to 15 Relay Word
bits that can be combined together with the SEL
OGIC control equation
operators listed in Ta bl e H .1 . If this limit must be exceeded, use a SEL
OGIC
control equation variable (SEL
OGIC control equation settings SV1 through
SV16) as an intermediate setting step.
For example, assume that the trip equation (SEL
OGIC control equation trip
setting TR) needs more than 15 Relay Word bits in its equation setting. Instead
of placing all Relay Word bits into TR, program some of them into the
SEL
OGIC control equation setting SV1. Next use the resultant SELOGIC
control equation variable output (Relay Word bit SV1) in the SEL
OGIC control
equation trip setting TR.
Note that the SEL
OGIC control equation variables (SELOGIC control equation
settings SV1 through SV16) are processed after the trip equation (SEL
OGIC
control equation trip setting TR). Thus, any tripping via Relay Word bits SV1
through SV16 can be delayed as much as 1/4 cycle. For most applications, this
is probably of no consequence.
The SEL
OGIC control equation settings as a whole are limited to no more than
447 elements and 49 rising-edge or falling-edge operators.
SEL
OGIC control equation settings that are set directly to 1 (logical 1) or 0
(logical 0) also have to be included in these limitations—each such setting
counted as one element.
After SEL
OGIC control equation settings changes have been made and the
settings are saved, the SEL-311C responds with the following message:
xxx Elements and yy Edges remain available
indicating that xxx Relay Word bits can still be used and yy rising or falling
edge operators can still be applied in the SEL
OGIC control equations for the
particular settings group.
To Next Page
Loading...
