GE Multilin g60, Instruction Manual

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GE Multilin G60 Generator Protection System 5-149
5 SETTINGS 5.5 FLEXLOGIC
5
Therefore, the required logic can be implemented with two FlexLogic equations with outputs of virtual output 3 and vir-
tual output 4 as shown below.
Figure 5–55: LOGIC EXAMPLE WITH VIRTUAL OUTPUTS
2. Prepare a logic diagram for the equation to produce virtual output 3, as this output will be used as an operand in the
virtual output 4 equation (create the equation for every output that will be used as an operand first, so that when these
operands are required they will already have been evaluated and assigned to a specific virtual output). The logic for
virtual output 3 is shown below with the final output assigned.
Figure 5–56: LOGIC FOR VIRTUAL OUTPUT 3
3. Prepare a logic diagram for virtual output 4, replacing the logic ahead of virtual output 3 with a symbol identified as vir-
tual output 3, as shown below.
Figure 5–57: LOGIC FOR VIRTUAL OUTPUT 4
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 out-
put 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 output will be 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, as shown below.
LATCH
CONTACT INPUT H1c
State=Closed
XOR
AND
Reset
Set
VIRTUAL OUTPUT 2
State=ON
VIRTUAL INPUT 1
State=ON
DIGITAL ELEMENT 1
State=Pickup
DIGITAL ELEMENT 2
State=Operated
OR #2 VIRTUAL OUTPUT 4
OR #1
(800 ms)
Timer 1
Time Delay
on Pickup
(200 ms)
Timer 2
Time Delay
on Dropout
VIRTUAL OUTPUT 1
State=ON
827026A2.VSD
VIRTUAL OUTPUT 3
CONTACT INPUT H1c
State=Closed
AND(2)
DIGITAL ELEMENT 2
State=Operated
VIRTUAL OUTPUT 3
827027A2.VSD
LATCH
CONTACT INPUT H1c
State=Closed
XOR
Reset
Set
VIRTUAL OUTPUT 2
State=ON
VIRTUAL INPUT 1
State=ON
DIGITAL ELEMENT 1
State=Pickup
OR #2
VIRTUAL
OUTPUT 4
OR #1
(800 ms)
Timer 1
Time Delay
on Pickup
(200 ms)
Timer 2
Time Delay
on Dropout
VIRTUAL OUTPUT 3
State=ON
VIRTUAL OUTPUT 1
State=ON
827028A2.VSD