TOOL GP-HAND 8T0460 - Caterpillar

Read this entire manual and all other publications pertaining to the work to be performed before installing, operating, or servicing this equipment. Practice all plant and safety instructions and precautions. Failure to follow instructions can cause personal injury and/or property damage.The Digital Min/Max ProAct(TM) control system is equipped with an overspeed shutdown feature that operates to protect against runaway or damage to the engine. Failure to properly install and operate the control system could result in possible personal injury or loss of life.
Application Specific Operation and Features
The 8400-504 and 8400-510 Digital Min/Max ProAct(TM) (DMMP) controls are designed to operate on the Caterpillar G3306 engine in natural gas fueled vehicle applications.Basic Minimum and Maximum Operation
All DMMP controls have the same basic minimum and maximum governing functions and direct foot pedal control between the speed limits. The control provides precise idle control over a wide load range experienced during idle conditions. An idle speed curve is available to help vary the idle speed at various loads. The control also provides precise speed control at high idle. The maximum governor provides speed control at maximum rated speed for the engine during normal control operation. The maximum governor has two speed setpoints like the minimum governor. See Chapter 4 for a more detailed description of the minimum and maximum speed governor setpoints.PTO Governor
The DMMP control provides a PTO (power take-off/fast idle) governor for controlled speed operation to run a PTO device, or to run the engine at a fast idle speed. The control has a contact to select the PTO governor. When the PTO is selected, the control disables the foot pedal, preventing the engine speed from changing. The PTO may be selected only when the transmission is in neutral.Foot Pedal Operation
The foot pedal, with idle validation contact, controls the actuator position when the engine speed is not being controlled by the governor. The foot pedal is part of the drive-by-wire control system that eliminates the mechanical linkages and cables connecting the foot pedal to the throttle body. The foot pedal provides the DMMP control with a 0 to 5 volt signal. The DMMP control uses that signal to control the position of the actuator/throttle. The idle validation contact provides an additional protection feature. When the foot pedal is at the minimum stop, the contact is open and disables the foot pedal input (which activates the minimum governor). This prevents engine speed changes due to foot pedal position sensor errors, and also serves as a safety feature should any foot pedal wires break. This application comes preset from the factory with the idle validation contact disabled. The default mode uses the minimum foot pedal setting plus 5% to trigger the functions normally triggered by the contact. The foot pedal mode is set in the FOOT PEDAL header. Use of this feature is dependent on the foot pedal manufacturer and model.Actuator and Position Feedback Operation
The DMMP control uses a ProAct(TM) I actuator. The ProAct I has position feedback that makes the actuator movement