Virtual Input Control; Trip Bus - GE 889 Instruction Manual

CHAPTER 4: SETPOINTS

Virtual Input Control

Trip Bus

889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Path:
Setpoints > Control > Virtual Input Control
FORCE VIRTUAL INPUT 1 (64)
Range: Off, On
Default: Off
The states of up to 64 Virtual Inputs are changed here. The current or selected status of
the Virtual Input is also shown here. The status is a state OFF (logic 0) or ON (logic 1). If the
corresponding Virtual Input selected under Setpoints/Inputs/Virtual Inputs is set to
"Latched," the "On" command initiated from this menu stays "On" and the status of this
Virtual Input is also "On" until the "Off" command is received. If the Virtual Input type is
"Self-Reset," the command and status of this Virtual Input reverts to "Off" after one
evaluation of the FlexLogic™ equations.
The 889 relay provides six identical Trip Bus elements. The Trip Bus element allows
aggregating outputs of protection, control elements, inputs without using FlexLogic and
assigning them in a simple and effective manner. Each Trip Bus can be assigned to trip,
alarm or the other logic actions. Simple trip conditioning such as latch, delay, and seal-in
delay are available.
Path:
Setpoints > Control > Trip Bus 1
FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
INPUT 1 to 16
Range: Off, Any FlexLogic operand
Default: Off
These settings select a FlexLogic operand to be assigned as an input to the Trip Bus.
LATCHING
Range: Enabled, Disabled
Default: Disabled
The setting enables or disables latching of the Trip Bus output. This is typically used
when lockout is required or user acknowledgement of the relay response is required.
RESET
Range: Off, Any FlexLogic operand
Default: Off
The trip bus output is reset when the operand assigned to this setting is asserted.
PICKUP DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 0.000 s
DROPOUT DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 0.000 s
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
CONTROL
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