Logic Elements - GE 339 Instruction Manual

S4 CONTROL
V INPUT FUNCTION
Disabled = 0
Enabled = 1
"Virtual Input 1 to ON = 1"
"Virtual Input 1 to OFF = 0"
V INPUT 1 TYPE
Latched
Self-Reset

Logic elements

6–126
VIRTUAL INPUT 1
Range: Off, On
Default: Off
The state of each virtual input can be controlled under
VIRTUAL INPUTS menu. For this purpose, each of the virtual inputs selected for control need
be "Enabled" under
SETPOINTS > S5 INPUTS/OUTPUTS > VIRTUAL INPUTS
Reset" or "Latched" specified.
If Self-Reset type was selected, entering "On" command will lead to a pulse of one
protection pass. To prolong the time of the virtual input pulse, one can assign it as a
trigger source to a Logic Element with a dropout timer set to the desired pulse time. If
"Latched" type is selected, the state of the virtual input will be latched, upon entering "On"
command.
Refer to the logic diagram below for more details.
Figure 43: Virtual inputs scheme logic
SETPOI T
SETPOI T
The 339 relay has 16 Logic Elements available to build simple logic using the state of any
programmed contact, virtual, or remote input, or from the output operand of a protection,
or control element. Changing the state of any of the assigned inputs used as trigger
sources, will change the state of the Logic Element, unless a blocking input is present. The
logic provides for assigning up to three triggering inputs in an "OR" gate for Logic Element
operation, and up to three blocking inputs in an "OR" gate for defining the block signal.
Pickup and dropout timers are available for delaying Logic Element operation and drop-
out respectively. In addition, the user can define whether to use the "ON", or "OFF" state of
the programmed element by selecting ASSERTED: "On" or "Off".
Referring to the Logic Element logic diagram below, the Logic Element can be set to one of
four functions: Control, Alarm, Latched Alarm, or Trip. The Trip output relay will be
triggered when Trip is selected as a function, and the Logic element operates. Output relay
#1 (Trip) will not be triggered during Logic Element operation if Alarm, Latched Alarm, or
Control is selected.
The "PICKUP" LED will turn on upon a Logic Element pickup condition except when the
Logic Element function is selected as Control.
The "ALARM" LED will turn on upon Logic Element operation if the Logic Element function
selected is either Alarm, or Latched Alarm.
SETPOINTS > S4 CONTROL >
S
LATCH
R
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS
, and its type "Self-
ACTUAL VALUES
V INPUT 1 NAME:
(Operand)
V Input 1 Status
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