GE L90 Instruction Manual page 430
Line current differential system
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FLEXLOGIC
4.
Program the FlexLogic equation for virtual output 3 by translating the logic into available FlexLogic parameters. The
equation is formed one parameter at a time until the required logic is complete. It is generally easier to start at the
output end of the equation and work back towards the input, as shown in the following steps. It is also recommended
to list operator inputs from bottom to top. For demonstration, the final outputs are arbitrarily identified as parameter
99, and each preceding parameter decremented by one in turn. Until accustomed to using FlexLogic, it is suggested
that a worksheet with a series of cells marked with the arbitrary parameter numbers be prepared shown as follows.
5
5.
Following the procedure outlined, start with parameter 99, as follows:
–
99: The final output of the equation is virtual output 3, which is created by the operator "= Virt Op n". This
parameter is therefore "= Virt Op 3".
–
98: The gate preceding the output is an AND, which in this case requires two inputs. The operator for this gate is a
2-input AND so the parameter is "AND(2)". Note that FlexLogic rules require that the number of inputs to most
types of operators must be specified to identify the operands for the gate. As the 2-input AND operates on the
two operands preceding it, these inputs must be specified, starting with the lower.
–
97: This lower input to the AND gate must be passed through an inverter (the NOT operator) so the next
parameter is "NOT". The NOT operator acts upon the operand immediately preceding it, so specify the inverter
input next.
–
96: The input to the NOT gate is to be contact input H1c. The ON state of a contact input can be programmed to
be set when the contact is either open or closed. Assume for this example that the state is to be ON for a closed
contact. The operand is therefore "Cont Ip H1c On".
5-206
Figure 5-101: Logic for virtual output 4
Figure 5-102: FlexLogic worksheet
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
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