GE L90 Instruction Manual

Also see for L90: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

5-130 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUALPRODUCT SETUP CHAPTER 5: SETTINGS5The activation and deactivation of user-programmable pushbuttons depends on whether latched or self-reset mode isprogrammed.• Latched mode — In latched mode, a pushbutton can be set (activated) by asserting the operand assigned to thePUSHBTN 1 SET setting, by directly pressing the associated front panel pushbutton, or with the graphical front panelinterface. The state of each pushbutton is stored in non-volatile memory and maintained through a loss of controlpower.The pushbutton is reset (deactivated) in latched mode by asserting the operand assigned to the PUSHBTN 1 RESETsetting, by directly pressing the active front panel pushbutton, or with the graphical front panel interface.It can also be programmed to reset automatically through the PUSHBTN 1 AUTORST and PUSHBTN 1 AUTORST DELAYsettings. These settings enable the autoreset timer and specify the associated time delay. The autoreset timer can beused in select-before-operate (SBO) breaker control applications, where the command type (close/open) or breakerlocation (feeder number) must be selected prior to command execution. The selection must reset automatically ifcontrol is not executed within a specified time period.• Self-reset mode — In self-reset mode, a user-programmable pushbutton can be set (activated) by asserting theoperand assigned to the PUSHBTN 1 SET setting, by pressing the front panel pushbutton, or by the graphical front panelinterface. A pushbutton remains active for the time it is pressed physically or pressed in the graphical front panelinterface, plus the dropout time specified in the PUSHBTN 1 DROP-OUT TIME setting. If the pushbutton is activated viaFlexLogic, the pulse duration is specified by the PUSHBTN 1 DROP-OUT TIME only. The time the operand assigned to thePUSHBTN 1 SET setting remains On has no effect on the pulse duration.The local and remote operation of each user-programmable pushbutton can be inhibited through the PUSHBTN 1 LOCALand PUSHBTN 1 REMOTE settings. If local inhibit is applied, the pushbutton ignores set and reset commands executedthrough the front panel pushbuttons. If remote inhibit is applied, the pushbutton ignores set and reset commandsexecuted through FlexLogic operands.The inhibit functions are not applied to the autoreset feature. The inhibit function can be used in SBO control operations toprevent user-programmable pushbutton activation and ensuring “one-at-a-time” select operation.The inhibit functions can also be used to prevent pushbutton activation from the accidental pressing of the front panelpushbuttons. The separate inhibit of the local and remote operation simplifies the implementation of local/remote controlsupervision.Pushbutton states can be logged by the event recorder. User-defined messages can also be associated with eachpushbutton and displayed on standard and enhanced front panels when the user-programmable pushbutton is activated,and when in the latched mode when the user-programmable pushbutton is deactivated. With the graphical front panelinterface, instead of messages, the status of user-programmable pushbuttons can display on a single-line diagram andcan also display in annunciator page windows and in actual values page cells.For the graphical front panel, the pushbuttons 1 to 8 are linked to the eight physical pushbuttons, and pushbuttons 9 to 16are mapped to the graphical interface pushbuttons. To set the buttons for pushbuttons 9 to 16, access Settings > ProductSetup > Graphical Panel > Single Line Diagram Editor, click the PB symbol in the toolbox, then configure pushbuttons 9 to16.PUSHBUTTON 1 FUNCTION — This setting selects the mode of the pushbutton (Self-Reset, Latched, Disabled). If set to“Disabled,” the pushbutton is not active and the corresponding FlexLogic operands (both “On” and “Off”) are de-asserted. Ifset to "Latched," the pushbutton remains on until reset.PUSHBTN 1 ID TEXT — This setting specifies the top 20-character line of the user-programmable pushbutton message and isintended to provide ID information of the pushbutton. See the User-definable Displays section in this chapter forinstructions on how to enter alphanumeric characters from the keypad. On a graphical front panel, this setting insteadcontrols the label of the user-programmable pushbutton component on single-line diagrams.The pulse duration of the remote set or local front panel pushbutton must be at least 50 ms to operate thepushbutton. This allows the user-programmable pushbuttons to properly operate during power cycling events andvarious system disturbances that can cause transient assertion of the operating signals.