WRENCH-TRACK 3B2861 - Caterpillar

Discrete Inputs
Discrete inputs are the switch input commands to the 701 control. In low voltage systems, or other systems where nominal 24 Vdc is available, the discrete inputs should be powered by this external voltage.If you are using the control-supplied aux voltage, which is recommended only for high voltage systems where 24 Vdc is not available, jumper terminal 7 to terminal 8. This connects the control's common to the discrete input common. Terminal 5 then supplies power (approximately +21 Vdc) to the discrete inputs. Since the aux voltage is not isolated from other control circuits, use only isolated contacts (dry or signal voltage rated) for the discrete circuits. DO NOT POWER ANY OTHER DEVICES WITH THE AUX VOLTAGE SOURCE.If you are supplying the discrete input voltage (24 Vdc), connect the voltage source negative (-) to terminal 8. Then run the voltage source positive (+) to the appropriate switch or relay contact and then to the corresponding discrete input.Minimum Fuel Contact
The minimum-fuel contact is the preferred means for a normal shutdown of the engine. It connects to terminal 9, Discrete Input A, of the control. The control will not operate without voltage applied to terminal 9. When the contact is closed, the voltage applied to terminal 9 allows the control to move the actuator to any position required for operating conditions.
The minimum-fuel contact is not intended for use in any emergency stop sequence. To prevent possible serious injury from an overspeeding engine, do NOT use the minimum-fuel contact as part of any emergency stop sequence.
Idle/Rated Contact
The Idle/Rated contact (open for Idle, closed for Rated) connects to terminal 10, Discrete Input B. This contact also determines which fuel limiter is in effect. In Idle, the control uses the Start Fuel Limit set point. In Rated, the control uses the Maximum Fuel Limit set point or Torque Limit schedule. When the Idle/Rated contact is closed, the control immediately switches the fuel limit to the maximum limit and ramps engine speed to the rated speed set point (or the speed specified by the Remote Input when the Remote Speed Setting input is enabled). When the Idle/Rated contact is opened, the control immediately switches on the Start Fuel Limit and ramps engine speed to the idle speed setting.The idle set point cannot be set above the rated set point. The fuel limiters (start or maximum) remain effective regardless of the Local/Remote input.Lower Speed Contact
The Lower Speed contact connects to terminal 11, Discrete Input C. When the Lower Speed contact is closed, the control lowers speed at a rate determined by the Lower Rate set point. When the contact is open, speed remains at its current value. Actuating the Lower Speed contact will cancel the ramps started by the Idle/Rated contact.The Lower Speed contact input is disabled when the Remote Speed Setting mode is selected by closing both the Lower Speed and Raise Speed contacts.Raise Speed Contact
The Raise Speed contact connects to terminal 12, Discrete Input D. When the Raise Speed contact is closed,