Virtual Inputs - GE 339 Instruction Manual

S5 INPUTS/OUTPUTS

Virtual inputs

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NOTE
NOTE:
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6–168
There are 32 virtual inputs that can be individually programmed to respond to input
commands entered via the relay keypad, or by using communication protocols.
Virtual input programming begins with enabling the Virtual Input Function, and selecting
the Virtual Input Type Self-Reset or Latched under
. Next, the user can assign a command On/Off to the enabled Virtual Input
VIRTUAL INPUTS
under
SETPOINTS > S4 CONTROLS > VIRTUAL INPUTS
diagram below, a Virtual Input type can be selected to be either Self-Reset, or Latched.
When Self-Reset is selected and the "On" command is executed, the virtual input is
evaluated as a pulse at a rate 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. Selecting the Latched type, will latch the virtual input state, when
the "On" command is executed.
The "On" state of the Virtual Input will be retained in the case of cycling of the relay control
power supply.
PATH: SETPOINTS > S5 INPUTS/OUTPUTS > VIRTUAL INPUTS
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
VI x NAME
Range: 14 characters
Default: Virtual IN x
This setting defines a programmable name for the Virtual Input.
VI x FUNCTION
Range: Disabled/Enabled
Default: Disabled
The Virtual Input is enabled and ready to be triggered when set to Enabled. All virtual
inputs will appear under the
VI x TYPE
Range: Self-Reset, Latched
Default: Self-reset
When the Self-Reset type is selected, the Virtual Input will be evaluated for one
protection pass only, upon "On" initiation and it will reset. When the Latched type is
selected, the virtual input will keep the state "On" until reset command "Off" is initiated.
See also the Virtual Inputs section under S4 CONTROLS, on how to trigger a virtual input
signal state.
Figure 6-79: Virtual inputs scheme logic
SETPOINTS > S5 INPUTS/OUTPUTS >
. Referring to the Virtual Inputs logic
S4 CONTROLS > SETPOINTS > VIRTUAL INPUTS
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS
menu.