4.14
SEL-587Z Instruction Manual
Date Code 20020903
Control Logic
SEL
OGIC
Control Equation Variables/Timers
SEL
OGIC
Control Equation Variables/Timers
SEL
OGIC
control equations allow the user to create customized logic in the
relay. The variables are labeled SVn (SEL
OGIC
control equation variable).
Fourteen SEL
OGIC
control equation variables (SV1 through SV14) are
available, 10 of which have timer outputs (SV5T through SV14T) (see
). Combine the Relay Word bits to form the required logic for the
specific application.
EXAMPLE 4.7
Close Feed Pumps for Long Busbar Fault
For example, in an installation, feed pumps must be closed if a bus
fault lasts longer than 15 cycles. Select SEL
OGIC
control equation
variable SV8 to monitor the differential elements and to start the
SV8T timer when any differential element asserts. Set timer pickup
SV8PU to 15 cycles; and timer dropout SV8DO to 0. When SV8T
asserts, close output OUT4, which is connected to the pumps. Enter
the following:
SV8 =
87A1 + 87B1 + 87C1
SEL
OGIC
Variable SV8
OUT4 =
SV8T
Output Contact OUT4
Figure 4.5
SEL
OGIC
Control Equation Variables/Timers.
SV1
SV2
SV2
SV3
SV3
SV4
SV4
SV1
SEL
OGIC
Control
Equation Variable/
Timer Input Settings
Relay
Word
Bits
SEL
OGIC
Control
Equation Variable/
Timer Input Settings
SV5T
SV5
SV5
SV6
SV6T
SV6
SV7
SV7T
SV7
SV5D0
SV5PU
SV6DO
SV6PU
SV7DO
SV7PU
SV8
SV8T
SV8
SV8DO
SV8PU
SV9
SV10
SV9DO
SV9PU
SV10DO
SV10PU
SV11
SV11DO
SV11PU
SV12
SV12DO
SV12PU
SV13
SV13DO
SV13PU
SV14
Relay
Word
Bits
SV9T
SV9
SV10T
SV10
SV11T
SV11
SV12T
SV12
SV13T
SV13
SV14T
SV14
SV14DO
SV14PU
Summary of Contents for SEL-587Z
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