4–82 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUALSYSTEM CHAPTER 4: SETPOINTSSwitching DeviceThe 869 supports two types of motor switching devices: breakers and contactors. Abreaker operation is controlled by two coils labeled “Trip” and “Close”. Each of them has tobe separately energized with a short pulse in order to change the state of the breaker. Acontactor operation is controlled by a single coil. When the coil is energized, the maincontacts are closed and when the coil is de-energized, the main contacts are open.The user has to select either “Breaker” or “Contactor” and the selection has to match theactual device type used. The selection is made in Setpoints > System > Motor > SwitchingDevice Type.Breakers The breaker connection/disconnection to/from the power system (racked-out by thebreaker racking mechanism, or isolated by the associated disconnect switches on a fixedcircuit breaker) is provided by monitoring the contact input “BKR CONNECTED”. If thecontact input selected under the “BKR CONNECTED” setpoint is asserted, the breaker isconsidered connected to the primary system. When the breaker is determineddisconnected, the breaker state is shown to be neither open, nor closed.Path: Setpoints > System > Breakers > Breaker XNAMERange: Up to 13 alphanumeric charactersDefault: BKR1CONTACT INPUT 52aRange: Off, Any FlexLogic operandDefault: OffSelects the Contact Input connected to the breaker auxiliary contact 52a.CONTACT INPUT 52bRange: Off, Any FlexLogic operandDefault: OffSelects the Contact Input connected to the breaker auxiliary contact 52b.CONNECTEDRange: Off, Any FlexLogic operandDefault: OffSelect a contact input to show whether the breaker is connected (Racked-in, ordisconnect switches switched-on), or disconnected (racked-out, or disconnect switchesswitched-off) from the system.CLOSE RELAY SELECTRange: Off, Relay 2Default: Relay 2Selection of "Relay 2" assigns the START command to Output Relay 2 (CLOSE/AUX). If "Off"is selected, Auxiliary Relay 2 is available for selection in all elements with auxiliary relayselection in the 869 and it is not activated by START command.FASTPATH:If “Relay 2” is selected, Auxiliary Relay 2 is not available for selection in any element.Table 4-19: Breaker status depending on availability of contacts 52a and 52b52a Contact Configured 52b Contact Configured Breaker StatusOpen ClosedYes Yes 52a contact open52b contact closed52a contact closed52b contact open
