Virtual Inputs - GE Multilin 850 Instruction Manual

INPUTS
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Virtual Inputs

4–90
When thresholds above 17V are selected, the internal +24V is disabled.
Path:
Setpoints > Inputs > Contact Inputs > Contact Input 1
NAME
Range: Up to 13 alphanumeric characters
Default: CI 1
An alphanumeric name may be assigned to a Contact Input for diagnostic, setting, and
event recording purposes. The CI X ON (Logic 1) FlexLogic operand corresponds to
Contact Input "X" being closed, while CI X OFF corresponds to Contact Input "X" being
open.
DEBOUNCE TIME
Range: 0.0 to 16.0 ms in steps of 0.5 ms
Default: 10.0 ms
The Debounce Time defines the time required for the contact to overcome 'contact
bouncing' conditions. As this time differs for different contact types and manufacturers,
set it as a maximum contact debounce time (per manufacturer specifications) plus some
margin to ensure proper operation.
EVENTS
Range: Enabled, Disabled
Default: Enabled
For example, to use Contact Input F1 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 1 NAME: "52b"
CONTACT INPUT 1 EVENTS: "Enabled"
The 52b contact is closed when the breaker is open and open when the breaker is closed.
The 850 relay is equipped with 64 Virtual Inputs that can be individually programmed to
respond to input signals from the keypad or from communications protocols. This has the
following advantages over Contact Inputs only:
• The number of logic inputs can be increased without introducing additional hardware.
• Logic functions can be invoked from a remote location over a single communication
channel.
• The same logic function can be invoked both locally via contact input or front panel
keypad, and/or remotely via communications.
• Panel switches can be replaced entirely by virtual switches to save cost and wiring.
All Virtual Input operands are defaulted to "Off" (logic 0) unless the appropriate input signal
is received.
Path:
Setpoints > Inputs > Virtual Inputs
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS