5-378 D60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUALINPUTS/OUTPUTS CHAPTER 5: SETTINGS5Program the Latching Outputs by making the following changes in the SETTINGS INPUTS/OUTPUTS CONTACTOUTPUTS 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 PUSHBUTTONS USER PUSHBUTTON 1 and USER PUSHBUTTON 2 menus:PUSHBUTTON 1 FUNCTION: “Self-reset”PUSHBTN 1 DROP-OUT TIME: “0.00 s”PUSHBUTTON 2 FUNCTION: “Self-reset”PUSHBTN 2 DROP-OUT TIME: “0.00 s”Application example 2A relay, having two latching contacts H1a and H1c, is to be programmed. The H1a contact is to be a Type-a contact, whilethe H1c contact is to be a Type-b contact (Type-a means closed after exercising the operate input; Type-b means closedafter exercising the reset input). The relay is to be controlled from virtual outputs: VO1 to operate and VO2 to reset.Program the Latching Outputs by making the following changes in the SETTINGS INPUTS/OUTPUTS CONTACTOUTPUTS CONTACT OUTPUT H1a and CONTACT OUTPUT H1c menus (assuming an H4L module):OUTPUT H1a OPERATE: “VO1”OUTPUT H1a RESET: “VO2”OUTPUT H1c OPERATE: “VO2”OUTPUT H1c RESET: “VO1”Since the two physical contacts in this example are mechanically separated and have individual control inputs, they do notoperate at exactly the same time. A discrepancy in the range of a fraction of a maximum operating time can occur.Therefore, a pair of contacts programmed to be a multi-contact relay do not guarantee any specific sequence of operation(such as make before break). If required, the sequence of operation must be programmed explicitly by delaying some of thecontrol inputs as shown in the next application example.Application example 3A make before break functionality must be added to the preceding example. An overlap of 20 ms is required to implementthis functionality.Write the following FlexLogic equation (EnerVista example shown).Set both timers (Timer 1 and Timer 2) to 20 ms pickup and 0 ms dropout.Program the Latching Outputs by making the following changes in the SETTINGS INPUTS/OUTPUTS CONTACTOUTPUTS CONTACT OUTPUT H1a and CONTACT OUTPUT H1c menus (assuming an H4L module):OUTPUT H1a OPERATE: “VO1”OUTPUT H1a RESET: “VO4”OUTPUT H1c OPERATE: “VO2”OUTPUT H1c RESET: “VO3”
