BOLT-SOCKET HEAD 4588848 - Caterpillar

Raise Speed/Load Contact (Input D; Terminal 28)
The Raise Speed/Load contact connects to terminal 28 (discrete input D). When the 721 is in Speed Control Mode (terminal 32 open) and the Raise Speed/Load contact is closed, the control raises speed at a rate determined by the Raise Speed Rate set point. When the contact is open, speed remains at its current value. Closing the Raise Speed/Load contact with the 721 in Speed Control Mode will cancel the ramps started by the Idle/Rated contact.When the 721 is in Load Control Mode (terminal 32 closed) and the Raise Speed/Load contact is closed, the control raises the load at a rate determined by the Raise Load Rate set point. When the contact is open, load remains at its current value. Closing the Raise Speed/Load contact with the 721 in Load Control Mode will cancel the ramps started by the Unload/Reset to Rated and Base Load contacts.The Raise Speed/Load contact input is disabled when the remote speed setting mode is selected by closing both the Lower Speed/Load and Raise Speed/Load contacts.Failed Speed Signal Override (Input E; Terminal 29)
The Failed Speed Signal Override is connected to terminal 29 (discrete input E). When the contact is open, the control operates normally, reducing control output to minimum fuel in the event of a loss of speed signal.Closing the contact overrides the failed speed signal function, which may be required for start-up. Prior to engine start-up, the speed signal is nonexistent. On engines requiring fuel during cranking, the Failed Speed Signal Override allows the actuator to open and provide fuel for starting.Unload/Reset to Rated Contact (Input F; Terminal 30)
The Unload/Reset to Rated contact connects to terminal 30 (discrete input F). When the 721 control is in Load Control Mode (terminal 32 closed) and the Unload/Reset to Rated contact is opened, the load ramps to the Unload Trip Level at the rate determined by the Unload Ramp Time. When the Unload Trip Level is achieved, the Breaker Open relay (Relay Output #3) will open until the Circuit Breaker Aux contact opens.When the 721 is in Speed Control Mode (terminal 32 open) and the Unload/Reset to Rated contact is opened momentarily, the speed will ramp to the rated speed set point at the rate determined by the Raise Speed Rate set point or the Lower Speed Rate set point.Base Load Contact (Input G; Terminal 31)
The Base Load contact connects to terminal 31 (discrete input G). When the Base Load contact is closed (and the Circuit Breaker Aux and Unload/Reset to Rated contacts are also closed), the control ramps the load at the load ramp rate (or unload ramp rate) to the Base Load Reference set point, and holds it there.Circuit Breaker Aux Contact (Input H; Terminal 32)
The Circuit Breaker Aux contact connects to terminal 32 (discrete input H). This contact changes the control state between speed control and load control.When the contact is open, the control uses the standard dynamics from Menu 1, runs in droop (but note that