D.3
Date Code 20090730 Instruction Manual SEL-734 Meter
Setting SELOGIC Control Equations
SEL
OGIC Control Equations
When setting ER sees a logical 0 to logical 1 transition, it generates an event
report (if the meter is not already generating a report that encompasses the
new transition). The rising edge operator in the above setting example allows
setting ER to see each transition individually.
SELOGIC Control Equation Falling Edge Operator F_TRIG
The falling edge operator F_TRIG is applied to individual Meter Word bits
only, not to groups of elements within parentheses. The falling edge operator
F_TRIG operates similarly to the rising edge operator, but looks for Meter
Word bit deassertion (element going from logical 1 to logical 0). The falling
edge operator in front of a Meter Word bit sees this logical 1 to logical 0
transition as a falling edge and asserts to logical 1 for one processing interval.
Set All SELOGIC
Control Equations
All SELOGIC control equations must be set one of the following ways (they
cannot be blank):
➤ Single Meter Word bit (e.g., FLTBK := IN101)
➤ Combination of Meter Word bits (e.g., OUT102 := RB01 AND
RB03 OR NOT RB02)
➤ Directly to logical 1 (e.g., T01_LED := 1)
➤ Directly to logical 0 (e.g., SV01 := 0)
Set SELOGIC Control Equations Directly to 1 or 0
SELOGIC control equations can be set directly to the following:
1 (logical 1) or 0 (logical 0)
instead of with Meter Word bits. If a SEL
OGIC control equation setting is set
directly to 1, it is always asserted/on/enabled. If a SEL
OGIC control equation
setting is set equal to 0, it is always deasserted/off/disabled.
Under the SHO Command (Show/View Settings) on page 10.24, note that a
number of the factory SEL
OGIC control equation settings are set directly to 1
or 0.
SELOGIC Control
Equation Limitations
Any single SELOGIC control equation setting is limited to 15 Meter Word bits
that can be combined together with the SEL
OGIC control equation operators
listed in Table D.1. If this limit must be exceeded, use a SEL
OGIC control
equation variable (SEL
OGIC control equation settings SV01 through SV16) as
an intermediate setting step.
For example, assume that the fault equation (SEL
OGIC control equation fault
setting FAULT) needs more than 15 Meter Word bits in its equation setting.
Instead of placing all Meter Word bits into FAULT, program some of them
into the SEL
OGIC control equation setting SV01. Next, use the resultant
SEL
OGIC control equation variable output (Meter Word bit SV01) in the
SEL
OGIC control equation trip setting FAULT.
Tab le D. 2 SEL OGIC Control Equation Settings Limitations for the SEL-734 Meter
Model
Model
Number
SELOGIC Control Equation Settings Limitations per Setting Group
0734
Total number of elements ≤ 486
Total number of rising edge or falling edge operators ≤ 54
Courtesy of NationalSwitchgear.com
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