C-10, C-12 and C-15 On-highway Engines Caterpillar

"PTO Configuration"

The "PTO Configuration" determines the features that are available for Dedicated PTO applications and the input signals that are used for Dedicated PTO applications. When the "PTO Configuration" is turned off, the application does not use the PTO. The remaining PTO programmable options require a "PTO On/Off" circuit that is connected to ECM Input 1. A PTO Switch On Lamp can also be connected to Output 1 (ECM J1/P1:30).

If the ECM is programmed to the Cab Switches, the ECM will use the signals from the following two switches for PTO Control and Cruise Control:

• Cab Set switch (J1/P1:35)

• Resume switch (J1/P1:44)

If the ECM is programmed to "Remote Switches", the ECM will monitor programmed signals such as the remote set switch and the remote resume switch. Signals from the cab controls will be ignored when the "PTO On/Off" circuit is on. The following components are cab controls:

• Brake Switch

• Clutch Switch

• Accelerator

• Cruise Control Switches

If the ECM is programmed to "Remote Throttle", the ECM will monitor J1/P1:68 for the remote accelerator pedal. The ECM will monitor programmed signals and the ECM will ignore all cab controls when the "PTO On/Off" circuit is ON.

"PTO Top Engine Limit"

The "PTO Top Engine Limit" is the top engine limit that is available by using a "PTO On/Off" circuit that is connected to Input 1 of ECM Connector J1/P1.

Note: The "PTO Configuration" must be programmed to Cab Switches, Remote Switches, or Remote Throttle before this parameter can be programmed.

"PTO Engine RPM Set Speed (0 = Off)"

This parameter allows automatic ramping to the preset rpm when the PTO is engaged. "PTO to Set Speed" must be programmed to "Yes" for this parameter to function. When the PTO is engaged the rpm will change according to the programmed "PTO Ramp Rate". This parameter is only available when the "PTO Configuration" is programmed to "Cab Switches", "Remote Switches", or "Remote Throttle".

"PTO Engine RPM Set Speed Input A"

The ECM controls this engine rpm. This control occurs when the "PTO ON/OFF" circuit is on and the "PTO Engine RPM Set speed Input A" switch is on. The RPM can be programmed to operate from Low Idle up to the PTO Top Engine Limit RPM. While the engine is operating at this set speed, all other inputs for speed control are ignored. The inputs for speed control that are ignored include the Cab Throttle switch, the Remote Throttle switch, the Set/Accel switch, and the Resume/Decel switch. This feature can also be used in conjunction with the "PTO to Set speed" feature and the "PTO Engine RPM Set Speed B" feature for multiple speed PTO operation. This feature can also override the "PTO to Set speed" feature and the "PTO Engine RPM Set Speed B" feature for multiple speed PTO operation.

The engine will only operate at this programmed speed when the "PTO ON/OFF" circuit is on and the "PTO Engine RPM Set Speed Input A" switch is on. The engine will operate at the programmed speed unless a condition that causes PTO operation kickout occurs. The conditions that will cause PTO operation kickout include the depression of the brake pedal, the depression of the clutch pedal, and the "PTO Vehicle Speed Limit" that is exceeded. The engine will return to low idle if the PTO operation is kicked out.

Note: The "PTO Configuration" parameter must be programmed to Cab Switches, Remote Switches, or Remote Throttle and the "PTO Engine RPM Set Speed Input A" parameter must be programmed to a dedicated switch input (J1/P1:6, J1/P1:46, J1/P1:58, or J1/P1:60) for this feature to function.

"PTO Engine RPM Set Speed Input B"

The ECM controls this engine rpm. This control occurs when the "PTO ON/OFF" circuit and the "PTO Engine RPM Set Speed Input B" switch is on and the "PTO Engine RPM Set Speed A" switch is off. The RPM can be programmed to operate from Low Idle up to the "PTO Top Engine Limit" RPM. While the engine is operating at this set speed, all other inputs for speed control are ignored except for the "PTO Engine RPM Set Speed A". The inputs for speed control that are ignored include the Cab Throttle switch, the Remote Throttle switch, the Set/Accel switch, and the Resume/Decel switch. This feature can also be used in conjunction with the "PTO to Set speed" feature for multiple speed PTO operation. This feature can also override the "PTO to Set speed" feature for multiple speed PTO operation.

The engine will only operate at this programmed speed when the "PTO ON/OFF" circuit and the "PTO Engine RPM Set Speed Input B" switch is on and the "PTO Engine RPM Set Speed A" switch is off. The engine will operate at the programmed speed unless a condition that causes PTO operation kickout occurs. The conditions that will cause PTO operation kickout include the depression of the brake pedal, the depression of the clutch pedal, and the "PTO Vehicle Speed Limit" that is exceeded. The engine will return to low idle if the PTO operation is kicked out.

Note: The "PTO Configuration" parameter must be programmed to Cab Switches, Remote switches, or Remote Throttle and the "PTO Engine RPM Set Speed Input B" parameter must be programmed to a dedicated switch input (J1/P1:6, J1/P1:46, J1/P1:58, or J1/P1:60) for this feature to function.

"PTO to Set Speed"

This parameter causes the ECM to proceed to the programmed "PTO Engine RPM Set Speed" when the "PTO ON/OFF" switch 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 "PTO Configuration Remote Throttle".

"Maximum PTO Enable Speed"

This parameter specifies the maximum engine speed for the engagement of the PTO mode. The PTO mode will engage when the engine rpm is equal to the programmed limit or less than the programmed limit. This parameter is only available when the "PTO Configuration" is programmed to "Cab Switches", "Remote Switches", or "Remote Throttle".

"PTO Cab Controls RPM Limit"

This determines the engine rpm limit of the cab mounted Accelerator Pedal Position Sensor when "PTO Configuration" is programmed to "Cab Switches" and the "PTO On/Off" circuit is on. This parameter is intended to prevent engine overspeed when dedicated PTO is used.

• If the parameter is programmed to Low Idle, the Cab Controls are ignored.

• If the parameter is programmed to "Top Engine Limit" (TEL), the engine will operate to the programmed "Top Engine Limit".

• If the parameter is programmed to "PTO TEL", the engine will operate to the programmed "PTO Top Engine Limit".

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 when the "PTO On/Off" circuit is on.

"PTO Kickout Vehicle Speed Limit" (VSL)

This is 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. (This uses Input 1.) If the vehicle speed signal exceeds this value, the engine will not maintain the set engine rpm.

"Torque Limit"

Illustration 1	g00628600
Operation of Torque limit (1) Programmed torque limit

The parameter for the "Torque Limit" defines the maximum torque output of the engine during Dedicated PTO operation. This parameter provides temporary protection of equipment. The Torque limit of the engine is active when the circuit for the Torque Limit Switch is on. The maximum value is the Rated Torque of the engine. The "Torque Limit" is programmable to N·m (lb ft) 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 Illustration 1.

"PTO Shutdown Time"

The "PTO Shutdown Time" sets the amount of idle time before the PTO shuts down. The time begins when the "PTO On/Off" circuit is on and there is no vehicle speed. The PTO Shutdown Timer will not begin counting if the engine is in Cold Mode. This parameter requires the "PTO Configuration" to be programmed to Cab Switches, Remote Switches or Remote Throttle for the timer to function.

Note: This feature does not shut down the vehicle's power. The ECM and the vehicle remain powered.

"PTO Shutdown Timer Maximum RPM"

This parameter can be used to reset the PTO Shutdown Timer if engine speed goes above the programmed "PTO Shutdown Timer Maximum RPM". Programming this parameter to 2120 rpm disables this feature. If this parameter is programmed to a value below 2120 rpm and the PTO Shutdown Timer is used, the timer will be reset when the engine RPM exceeds the programmed value.

Illustration 2	g00671143
"PTO Shutdown Timer Maximum RPM" Graph

"PTO Activates Cooling Fan"

This parameter requires the use of the ECM cooling fan circuit. When this parameter is programmed to Continuous Mode, the ECM will signal the cooling fan to run continuously when the "PTO On/Off" circuit is on. The cooling fan runs continuously in order to reduce changes in the load while the engine is being used for dedicated PTO applications. When this parameter is programmed to the normal mode, the operation of the fan is based on coolant temperature, inlet air temperature or air conditioning high head pressure. The "PTO Configuration" must be programmed to "Cab Switches", "Remote Switches" or "Remote Throttle" before this parameter can be programmed. The "Fan Control Type" must be programmed to the "On/Off" setting or the "Three-Speed Fan Setting".