BELLCRANK 3V0647 - Caterpillar

Illustration 1 g02102909
Schematic for the PTO inputs for the "Ramp Up/Ramp Down" mode of operationPlacing the PTO enable switch to the Enable position transfers the control of the desired engine speed. The control is transferred from the throttle position sensor to the PTO speed control function. The PTO ramp up/down switch controls the desired engine speed.The PTO ramp up/down switch is spring loaded to the normally open position. When the switch is held in the Ramp Up position, the desired engine speed increases according to the value of the "Engine Accel Rate" parameter. When the switch is released, the desired engine speed maintains the set speed. After the desired engine speed has been set, momentarily placing the switch in the Ramp Up position increases the desired engine speed by 20 RPM.When the PTO ramp up/down switch is held in the Ramp Down position, the desired engine speed decreases according to the value of the "Engine Accel Rate" parameter. When the switch is released, the desired engine speed maintains the set speed. After the desired engine speed has been set, momentarily placing the switch in the Ramp Down position decreases the desired engine speed by 20 RPM.If the "PTO Ramp Up" and "PTO Ramp Down" inputs are connected to the -Battery at the same time, the ECM will ignore the inputs. The desired engine speed will not change."Set/Resume" ModeThis mode uses four inputs. The inputs are provided by three switches. Refer to Illustration 2.
Illustration 2 g02102912
Schematic for the PTO inputs for the "Set/Resume" mode of operationPlacing the PTO enable switch to the Enable position transfers the control of the desired engine speed. The control is transferred from the throttle position sensor to the PTO speed control function. The