PTO Ramp Up/Down (Set/Resume) Circuit on Caterpillar Engines
PTO Mode
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| Figure 1.1 - Panel Instrument (266-2297) |
The PTO speed control function requires the following inputs:
- PTO switches
- The PTO Mode parameter
The PTO switches enable the PTO speed control function and the PTO switches control the desired engine speed.
The PTO Mode parameter determines the mode of operation. There are two modes of operation: Ramp Up/Ramp Down and Set/Resume. Use the CAT ET in order to change the value of the parameter.
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| Figure 1.2 - PTO Mode (Configuration Tool) |
1). Ramp Up/Ramp Down Mode
This mode uses three inputs. The inputs are provided by two switches.
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| Figure 1.3 - Schematic for PTO inputs (Ramp Up/Ramp Down) |
Placing the PTO Enable switch to the "Enable" position transfers the control of the desired engine speed 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" or "Ramp Down" position, the desired engine speed increases/decreases according to the value of the Engine Acceleration 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" or "Ramp Down" position increases/decreases the desired engine speed by 20 rpm.
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| Figure 1.4 - Engine Acceleration Rate (Configuration Tool) |
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.
2). Set/Resume Mode
This mode uses four inputs. The inputs are provided by three switches.
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| Figure 1.5 - Schematic for the PTO inputs (Set/Resume) |
Placing the PTO Enable switch to the "Enable" position transfers the control of the desired engine speed from the Throttle Position Sensor to the PTO speed control function. The PTO Interrupt Switch momentarily transfers control back to the Throttle Position Sensor. The PTO Set/Resume switch controls the desired engine speed.
The PTO Set/Resume switch is spring loaded to the normally open position. If the switch is momentarily placed in the "Set" or "Resume" position, the desired engine speed will be set to the current engine speed. If the switch is held in the "Set" or "Resume" position, the desired engine speed will increase/decrease according to the value of the Engine Acceleration Rate parameter. After the desired engine speed has been set, the desired engine speed will increase/decrease by 20 rpm when the PTO ramp up/down switch is momentarily placed in the "Set" or "Resume" position.
If the "PTO Set" and "PTO Resume" inputs are connected to the −Battery at the same time, the ECM will ignore the inputs. The desired engine speed will not change.
#Monitor the Status on CAT ET
By pressing the PTO Ramp Up/Set Switch or PTO Ramp Down/Resume Switch, monitor the value (On/Off) on CAT ET. Read More: Status Tool on Caterpillar ET Software.
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| Figure 1.6 - PTO Ramp Up/Set Switch (On) |
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| Figure 1.7 - PTO Ramp Down/Resume Switch (On) |
#Monitor the Real Time Graphing on CAT ET
Starts the engine, monitor the PTO Ramp Up/Set Switch or PTO Ramp Down/Resume Switch and output to controls the desired Engine Speed. Read More: Real Time Graphing using Caterpillar ET Software.
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| Figure 1.9 - PTO Ramp Up/Set Switch |
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| Figure 1.9 - PTO Ramp Down/Resume Switch |
#ECM Connector
(J1/P1-41) PTO Interrupt Switch
(J1/P1-56) PTO Enable Switch
(J1/P1-58) PTO Ramp Up Switch (Set)
(J1/P1-60) PTO Ramp Down Switch (Resume)
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