CHAPTER 5: SETTINGS INPUTS/OUTPUTS
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-415
5
Figure 5-230: Input contact debouncing mechanism and time stamp sample timing
Contact inputs are isolated in groups of four to allow connection of wet contacts from different voltage sources for each
group. The
CONTACT INPUT THRESHOLDS determine the minimum voltage required to detect a closed contact input. This
value is selected according to the following criteria: 17 for 24 V sources, 33 for 48 V sources, 84 for 110 to 125 V sources
and 166 for 250 V sources.
For example, to use contact input H5a as a status input from the breaker 52b contact to seal-in the trip relay and record it
in the Event Records menu, make the following settings changes:
CONTACT INPUT H5a ID: "Breaker Closed (52b)"
CONTACT INPUT H5a EVENTS: "Enabled"
Note that the 52b contact is closed when the breaker is open and open when the breaker is closed.
5.9.2 Virtual inputs
SETTINGS INPUTS/OUTPUTS VIRTUAL INPUTS VIRTUAL INPUT 1(64)
The virtual inputs and outputs are digital signals associated with UR-series internal logic signals. Virtual inputs include
signals generated by the local user interface. The virtual outputs are outputs of FlexLogic equations used to customize the
device. Virtual outputs can also serve as virtual inputs to FlexLogic equations.
VIRTUAL INPUT 1
VIRTUAL INPUT 1
FUNCTION: Disabled
Range: Disabled, Enabled
VIRTUAL INPUT 1 ID:
Virt Ip 1
Range: up to 20 alphanumeric characters
VIRTUAL INPUT 1
TYPE: Latched
Range: Self-Reset, Latched
VIRTUAL INPUT 1
EVENTS: Disabled
Range: Disabled, Enabled
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