4-28 L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUALFRONT PANEL INTERFACE CHAPTER 4: INTERFACES4buttons.4.2.9 Breaker controlThe L30 can interface with associated circuit breakers. In many cases the application monitors the state of the breaker,that can be presented on faceplate LEDs, along with a breaker trouble indication. Breaker operations can be manuallyinitiated from the faceplate keypad or automatically initiated from a FlexLogic operand. A setting is provided to assignnames to each breaker; this user-assigned name is for the display of related flash messages. These features are providedfor two breakers; the user can use only those portions of the design relevant to a single breaker, which must be breaker 1.It is assumed in the following discussion that the SETTINGS SYSTEM SETUP BREAKERS BREAKER 1(2) BREAKERFUNCTION setting is "Enabled" for each breaker.4.2.9.1 Control mode selection and monitoringInstallations can require that a breaker be operated in the three-pole only mode (3-pole), or in the one and three-pole (1-pole) mode, selected by setting. If the mode is selected as three-pole, a single input tracks the breaker open or closedposition. If the mode is selected as one-pole, all three breaker pole states must be input to the relay. These inputs must bein agreement to indicate the position of the breaker.For the following discussion it is assumed that the SETTINGS SYSTEM SETUP BREAKERS BREAKER 1(2) BREAKER1(2) PUSH BUTTON CONTROL setting is “Enabled” for each breaker.4.2.9.2 Faceplate (user key) controlAfter the 30 minute interval during which command functions are permitted after a correct command password, the usercannot open or close a breaker via the keypad. The following discussions begin from the not-permitted state.4.2.9.3 Control of two breakersFor the following setup example, the (Name) field represents the user-programmed variable name.For this example, the relay is connected and programmed for both breaker 1 and breaker 2. The USER 1 key performs theselection of which breaker is to be operated by the USER 2 and USER 3 keys. The USER 2 key manually closes the breaker, andthe USER 3 key manually opens the breaker.
