5-250 G30 Generator Protection System GE Multilin5.8 INPUTS AND OUTPUTS 5 SETTINGS5The latching output contacts are mechanically bi-stable and controlled by two separate (open and close) coils. As such theyretain their position even if the relay is not powered up. The relay recognizes all latching output contact cards and populatesthe setting menu accordingly. On power up, the relay reads positions of the latching contacts from the hardware before exe-cuting any other functions of the relay (such as protection and control features or FlexLogic).The latching output modules, either as a part of the relay or as individual modules, are shipped from the factory with alllatching contacts opened. It is highly recommended to double-check the programming and positions of the latching con-tacts when replacing a module.Since the relay asserts the output contact and reads back its position, it is possible to incorporate self-monitoring capabili-ties for the latching outputs. If any latching outputs exhibits a discrepancy, the LATCHING OUTPUT ERROR self-test error isdeclared. The error is signaled by the LATCHING OUT ERROR FlexLogic operand, event, and target message.• OUTPUT H1a OPERATE: This setting specifies a FlexLogic operand to operate the ‘close coil’ of the contact. Therelay will seal-in this input to safely close the contact. Once the contact is closed and the RESET input is logic 0 (off),any activity of the OPERATE input, such as subsequent chattering, will not have any effect. With both the OPERATE andRESET inputs active (logic 1), the response of the latching contact is specified by the OUTPUT H1A TYPE setting.• OUTPUT H1a RESET: This setting specifies a FlexLogic operand to operate the ‘trip coil’ of the contact. The relay willseal-in this input to safely open the contact. Once the contact is opened and the OPERATE input is logic 0 (off), anyactivity of the RESET input, such as subsequent chattering, will not have any effect. With both the OPERATE and RESETinputs active (logic 1), the response of the latching contact is specified by the OUTPUT H1A TYPE setting.• OUTPUT H1a TYPE: This setting specifies the contact response under conflicting control inputs; that is, when both theOPERATE and RESET signals are applied. With both control inputs applied simultaneously, the contact will close if set to“Operate-dominant” and will open if set to “Reset-dominant”.Figure 5–120: CONTACT INPUT/OUTPUT MODULE TYPE 4L CONTACT 1 LOGICApplication Example 1:A latching output contact H1a is to be controlled from two user-programmable pushbuttons (buttons number 1 and 2). Thefollowing settings should be applied.Program the Latching Outputs by making the following changes in the SETTINGS INPUTS/OUTPUTS CONTACT OUT-PUTS CONTACT OUTPUT H1a menu (assuming an H4L module):OUTPUT H1a OPERATE: “ PUSHBUTTON 1 ON”OUTPUT H1a RESET: “ PUSHBUTTON 2 ON”Program the pushbuttons by making the following changes in the PRODUCT SETUP USER-PROGRAMMABLE PUSHBUT-TONS USER PUSHBUTTON 1 and USER PUSHBUTTON 2 menus:PUSHBUTTON 1 FUNCTION: “Self-reset” PUSHBUTTON 2 FUNCTION: “Self-reset”PUSHBTN 1 DROP-OUT TIME: “0.00 s” PUSHBTN 2 DROP-OUT TIME: “0.00 s”MESSAGE OUTPUT H1a RESET:OffRange: FlexLogic operandMESSAGE OUTPUT H1a TYPE:Operate-dominantRange: Operate-dominant, Reset-dominantMESSAGE OUTPUT H1a EVENTS:DisabledRange: Disabled, EnabledFLEXLOGIC OPERANDCont Op 1 ClosedSETTING= Operate-dominantCONTACT OUTPUT H1a TYPESETTING= OnCONTACT OUTPUT H1aOPERATEANDSETTING= OnCONTACT OUTPUT H1a RESET= Reset-dominantNon-volatile,Set-dominantLatchSRNon-volatile,Set-dominantLatchSRH1aH1bANDCloseOpenOROROn859744A1.vsd
