CHAPTER 12: LOCAL INTERFACE USER-PROGRAMMABLE PUSHBUTTONS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 603
User-programmable pushbutton settings
Select the Settings > Local HMI > User-Programmable Pushbuttons menu to open the
user-programmable pushbuttons settings window.
Figure 538: User-programmable pushbutton configuration settings
The following settings are available for each user-programmable pushbutton.
Function
Range: Disabled, Latched, Self-Reset
Default: Disabled
This setting selects the pushbutton operating characteristic. If set to “Disabled,” the
pushbutton is not active and the corresponding operands (both on-state and off-state
operands) are de-asserted. If set to “Self-Reset,” the control logic is activated by the
pulse (longer than 100 ms) issued when the pushbutton is initiated physically via the
front panel interface or initiated virtually via logic.
When in “Self-Reset” mode and activated locally, the pushbutton control logic asserts
the corresponding on-state operand as long as the pushbutton remains physically
initiated. After the pushbutton is released, the de-assertion of the operand is delayed by
the drop out timer. The off-state operand is asserted when the pushbutton element is
deactivated. If the pushbutton is activated remotely, the pushbutton control logic
asserts the corresponding on-state operand only for the time specified by the
Dropout
Time
setting.
If set to “Latched,” the pushbutton control logic alternates the state of the corresponding
operand between the on-state and off-state on each button press or by virtually
activating the pushbutton (assigning set and reset operands). In latched mode, the
operand states are stored in non-volatile memory. If the power supply goes off, the
correct state of the pushbutton is retained upon subsequent power-up.
Set
Range: any FlexLogic operand or shared operand
Default: OFF
When the operand assigned to this setting is asserted, the pushbutton operates and the
PUSHBUTTON 1 ON operand asserts. The duration of the incoming set signal must be at
least 100 ms.
Reset
Range: any FlexLogic operand or shared operand
Default: OFF
When the operand assigned to this setting is asserted, the pushbutton resets and the
PUSHBUTTON 1 OFF operand asserts. This setting applies when the pushbutton is in
latched mode. The duration of the incoming set signal must be at least 100 ms.
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