Contact Input And Output Default Assignment; Contact Input Configuration - GE D90 Plus Instruction Manual

PROTECTION INPUTS AND OUTPUTS

Contact input and output default assignment

Contact input configuration

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When a new settings file is created, the available contacts are automatically assigned to
the protection or automation functions according to the following convention.
First I/O module → protection.
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All subsequent I/O modules → automation.
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For example, if a D90 is configured with contact input/output cards in slots E, F, and G,
then the inputs and outputs associated with slot E are assigned to protection and the
inputs and outputs associated with slots F and G are assigned to automation.
These default assignments may be changed to match the requirements of the application.
This is done by right-clicking on the setting filename and choosing the menu Manage
Settings File > I/O Assignments menu item. The following window is displayed.
Figure 275: Contact input and output assignments
All available contact inputs and output can be reassigned using the >> and << buttons.
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The D90 can monitor the status of up to 115 field contacts. Each input can be wetted
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from the D90 48 volt auxiliary supply or from an external power supply. Each contact
input has a dedicated delay timer for filtering of contact bouncing. The D90
detect an oscillating input via the chatter feature. Each contact input active impedance
circuitry to provide security against false turn-on of an input due to excessive stray
capacitance of field wiring.
A raw status is scanned synchronously for all contact inputs at the rate of 0.25 ms as
shown below. A new contact input state must be maintained for a user-programmable
debounce time for the D90
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to validate the new contact state. The debounce time is set
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D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
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can also