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Power Take-Off (PTO) Operation on CUMMINS Engines

Power Take-Off (PTO) - with Signature/ ISX Engine

Figure 1.1 - Features and Parameters (PTO/Remote PTO)

PTO Set Up
CUMMINS Engines can support different types of PTO Engine Operation:
→Cab PTO Switches
→Remote Station PTO Switches
→Remote PTO Switch
→Accelerator Override in PTO
→Vehicle Speed Control in PTO
→PTO Pump Mode
→Transmission Driven PTO

Cab PTO Switches
Standard PTO Control Switches are hardwired in the Cab (or a Multiplexed device, can be used by the TEM)
A. Requires these switch inputs:
→PTO On/Off Switch (Must be "On").
→PTO Set Speed Switch (Decelerate Switch)/ (Momentary input from either of these switches).
→PTO Resume Speed Switch (Accelerate Switch).
B. Allows for variable PTO Speed operation from Min to Max operation within PTO Settings, and ramp rate change.
C. PTO is activated at one of two programmable speeds.
→Settings for PTO Set Switch Speed and PTO Resume Switch Speed.

Feature Description
Applications like cement mixers, dry bulk haulers, dump trucks, and refuse vehicles require the engine to provide constant speeds regardless of engine load. The Power Take Off (PTO) feature allows the operator to select three pre-programmed engine speeds, and to adjust engine speed with the use of cruise control switches in the cab or remotely.

This feature is active only below the speed selected by the PTO maximum vehicle speed. A separate remote-mounted switch controls remote PTO.

Adjustable Parameters
A). Open Cummins INSITE and connecting to the ECM, or connect to an ECM Image. Read More: How to Connecting CUMMINS Engines using Cummins INSITE Software.
B). Select Features and Parameters on left-side menu (as Figure 1.1 above).
Figure 1.2 - PTO/Remote PTO

PTO/Remote PTO
Select the feature name to enable or disable the Power Take Off (PTO) and Remote PTO features using the drop-down list in the ECM Value column.

Additional Switch Engine Speed
The speed setting that can be attained by activation of an additional switch while Power Take Off is active. This is a separate switch from the cruise control set/resume switch. The additional switch engine speed can be set to a different speed from the set switch engine speed and the resume switch engine speed, enabling the availability of up to 3 different power take off speeds. This speed must be set equal to or greater than Minimum Engine Speed and less than or equal to Maximum Engine Speed.

Maximum Engine Load
Limits maximum engine torque to ensure that the Power Take Off drive and connected equipment are not damaged by excessive engine torque input.

Maximum Engine Speed
The highest engine speed setting at which Power Take Off will operate. This speed must be set equal to or greater than Minimum Engine Speed.

Maximum Vehicle Speed
Enables Power Take Off operation up to the maximum vehicle speed when the vehicle speed has been detected by the ECM.

Minimum Engine Speed
The lowest engine speed setting at which Power Take Off will operate. This speed must be set equal to or less than Maximum Engine Speed.

Switch Ramp Rate
Determines how quickly engine speed changes to the selected Power Take Off speed or to a new Power Take Off speed when the Power Take Off speed is increased or decreased.

Resume Switch Engine Speed 
The speed setting that can be attained by activation of the resume switch while Power Take Off is active. The resume switch engine speed can be set to a different speed from the set switch engine speed. This provides two speeds for various Power Take Off requirements. This speed must be set equal to or greater than Minimum Engine Speed and less than or equal to Maximum Engine Speed.

Set Switch Engine Speed
The speed setting that can be attained by activation of the set switch while Power Take Off is active. This speed must be equal to or greater than Minimum Engine Speed and less than or equal to Maximum Engine Speed.

Accelerator Override
Enables the operator to increase the Power Take Off speed by using the accelerator, up to the accelerator override maximum speed.

Remote PTO
When enabled, this parameter allows the engine, while in PTO, to be controlled by a control panel or device outside of the vehicle cab.
Figure 1.3 - Remote PTO
#Note the following:
  • During Power Take Off operation the accelerator is disabled unless accelerator override is enabled.
  • Depending on the OEM, activating the trailer brakes will deactivate the Power Take Off feature if an OEM switch is present.

ECM - OEM Port/ Connector:
→Remote Throttle Assembly (Signal): pin 21.
→Accelerator Position (Signal): pin 47. 
→Remote PTO Switch (Signal): pin 34.
→Remote Throttle Enable Switch (Signal): pin 43
→Cruise Control/ PTO Resume (pin 24) /Set (pin 14) Switch (Signal).
→Cruise Control/ PTO On/Off Switch (Signal): pin 23.
→Accelerator Interlock Switch (Signal): pin 42.
Figure 1.4 - PTO Additional Switch (PTO On/Off Switch) 


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