PTO Installation and Application Manual, SEHS9857 is available to further explain these features and how to install them.
Torque Limit
Torque limit of the engine applies when the PTO On/Off circuit is ON (Multi-Function Input #1), and the vehicle speed is less than the programmed Idle/PTO vehicle speed limit. The Torque Limit also applies if ECM Connector J1/P1, pin-32 is connected to Sensor Common with the PTO On/Off circuit OFF regardless of the vehicle speed.
Figure 6 – Torque Limit Operation
The maximum value is the Rated Torque of the engine. Programmable to lb ft (N·m) of torque, programming a value higher than the Rated Torque is limited by the ECM to Rated Torque. The torque limit is indicated by the dashed line in figure 6. PTO Configuration must be programmed to Cab Switches, Remote Switches, or Remote Throttle for the Torque Limit to function.
PTO Configuration
Determines the use of the ECM Multi-Function inputs, if any, for PTO applications. OFF (default) indicates the application does not use PTO. The remaining PTO programmable options require a PTO On/Off circuit connected to ECM Connector J1/P1, pin-8. If programmed to Cab Switches the ECM will use the Cab Set (J1/P1, pin-25) and Resume (J1/P1, pin-15) switch inputs for PTO control as well as Cruise Control.
If programmed to Remote Switches the ECM will monitor J1/P1, pin-32 for PTO Set and J1/P1, pin-31 for PTO Resume, ignoring the Cab Switches when the PTO On/Off circuit is ON.
If programmed to Remote Throttle, the ECM will monitor J1/P1, pin-32 for PTO Set and J1/P1, pin-31 for PTO Resume, ignoring the Cab Switches when the PTO On/Off circuit is ON. The second, remote throttle must be connected to the Throttle Position Input (J1/P1, pin-37), and switched in or out of the circuit with a relay at the same time as the PTO On/Off Switch is ON or OFF.
PTO Top Engine Limit
The top engine limit available using a PTO On/Off circuit connected to pin-8 of ECM Connector J1/P1. This parameter is programmable to 3000 rpm maximum, and is limited by the programmed Top Engine Limit (TEL) parameter.
NOTE: PTO Configuration must be programmed to Cab Switches, Remote Switches, or Remote Throttle before this parameter can be programmed.
PTO to Set Speed
This parameter causes the ECM to proceed to the programmed PTO Engine RPM Set Speed when the PTO On/Off circuit is ON. PTO Configuration must be programmed to Cab Switches or Remote Switches before this parameter can be programmed.
NOTE: This parameter is not available for Remote Throttle.
PTO Engine RPM Set Speed
The engine rpm the ECM will allow the engine to proceed to when the PTO On/Off circuit is ON and then the Cruise Control Set Switch is toggled.
If the PTO to Set Speed parameter is programmed to YES, the engine will proceed to this speed whenever the PTO On/Off circuit is ON.
NOTE: PTO Configuration must be programmed to Cab Switches or Remote Switches for this parameter to function.
This parameter must be programmed higher than the programmed Low Idle. If programmed to a higher value than the PTO Top Engine Limit, the Set Speed will be limited by the lower PTO Top Engine Limit.
For one rpm set speed operation above low idle, (low idle and PTO Engine RPM Set Speed) the PTO Top Engine Limit should be programmed to the same rpm as the PTO Engine RPM Set Speed.
For two rpm set speeds above low idle, program this parameter to some intermediate value between the low idle and the PTO Top Engine Limit.
Place the PTO On/Off circuit switch to the ON position. Toggle the Set switch once to cause rpm to advance to the PTO Engine RPM Set Speed. Toggle the Set Switch again, and the engine advances to the PTO Top Engine Limit. Toggling the Resume Switch decreases the engine rpm to the previous set speed.
PTO Cab Throttle RPM Limit
Determines the engine rpm limit of the Cab Throttle Position Sensor when PTO Configuration is programmed to Cab Switches and the PTO On/Off circuit is ON.
* If programmed to Low Idle, the Cab Throttle Position Sensor is ignored.
* If programmed to TEL, the engine will operate to the programmed Top Engine Limit.
* If programmed to PTO TEL, the engine will operate to the programmed PTO Top Engine Limit.
This parameter is intended to prevent engine overspeed while using dedicated PTO.
NOTE: PTO Configuration must be programmed to Cab Switches for this parameter to take effect.
If PTO Configuration is programmed to Remote Switches or Remote Throttle, the ECM will always ignore the Cab Throttle Position Sensor when the PTO On/Off circuit is ON.
PTO Vehicle Speed Limit (AUG96 and later Personality Modules)
For AUG96 and later Personality Modules this parameter determines the maximum vehicle speed for setting or maintaining a set engine rpm in PTO mode. PTO mode is entered if the PTO On/Off switch is ON (uses Multi-Function Input #1). If the vehicle speed signal exceeds this value, the engine will no longer maintain the set engine rpm. For MAR96 and earlier Personality Modules the Idle/PTO Vehicle Speed Limit determines the maximum PTO Vehicle Speed (refer to “Idle/PTO Vehicle Speed Limit” on page 28).
