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Intermediate Speed Control on Cummins INSITE Software (CUMMINS Engines)

Intermediate Speed Control (ISC)

Figure 1.1 - Control Panel for QSB3.3 CM2150

#Feature Description
Up to 3 Intermediate Speed Control set speeds (1,2,3) can be selected, depending on OEM availability. A multi-position switch or three toggle switches must be installed by the OEM to support this feature. Additionally, up to 5 Variable Intermediate Speed Control set speeds (1,2,3,4,5) can be selected and the operator can select these speeds using an OEM installed accelerator lever.

The three preset Intermediate Speed Control set speeds may be adjusted with an increment / decrement switch or with INSITE, and may not exceed the low or high idle governor engine speed limits. The 5 Intermediate Speed Control Variable Speed Control set speeds are not adjustable with the increment/ decrement switch, but are adjustable with INSITE. Only one droop setting is available for all Intermediate Speed Control speeds.

One of the switch inputs may be used as a validation input. In this case, the ECM calibration uses the ECM pin for Intermediate Speed Control 3 as the input and only two Intermediate Speed Control set speeds will be available. The five variable Intermediate Speed Control inputs will NOT be available. If more than one Intermediate Speed Control switch is turned ON, the lowest speed switch has priority.

#Adjustable Parameters
Figure 1.2 - Intermediate Speed Control

Intermediate Speed Control
Select the feature name to enable or disable the feature using the drop down list in the ECM Value column.

Droop
Sets the percentage of droop if the maximum speed is reached while using any ISC (1, 2, or 3). Use the spin box to adjust the percentage up or down. A smaller value results in a governor droop with a steeper slope.

Maximum Speed
This is the maximum allowable engine speed while Intermediate Speed Control is active.

Minimum Speed
This is the minimum allowable engine speed while Intermediate Speed Control is active.

Switch 1-3 Mode
These parameters controls the operating mode for the ISX (1, 2, and 3) switch and can be configured as:
  • Low Speed Governor — (Mode A) The Intermediate Speed Control set speed acts as a low speed governor, and the set speed becomes the Minimum Engine Speed. The operator can use the accelerator pedal to increase the engine speed above the set speed.
  • Accelerator Override — (Mode C) The Intermediate Speed Control set speed runs as constant speed, and accelerator pedal input is ignored.
  • High Speed Governor — (Mode B) The Intermediate Speed Control set speed acts as high speed governor, and the set speed becomes the Maximum Engine Speed. The operator can use the accelerator pedal to control the engine speed up to the set speed.

Switched Set Speed 1-3
These parameters sets the engine speed activated by the ISC 1, 2, or 3 switch.

Idle Validation Switch
When enabled, the ISC 3 switch is used as a validation input instead of a third speed switch. This allows the Variable Speed and Set Points 1-5 to be used by the operator. When disabled and the ISC 3 is selected, the engine speed will use the Switch 3 Mode setting.

Increment / Decrement Switch
When enabled, the ramp rates and step size can be configured.
Figure 1.3 - Increment/ Decrement Switch

Acceleration Ramp Rate  - This parameter determines the rate of increase for engine speed when the increment switch is engaged for more than a calibrated amount of time.

Deceleration Ramp Rate - This parameter determines the rate of increase for engine speed when the increment switch is engaged for more than a calibrated amount of time.

Intermediate Speed Control Speed Step Size - This parameter determines how much the engine speed changes when the Increment or Decrement speed is engaged for less than a calibrated amount of time.

Save Set Speeds on Power Down
When enabled, the current Intermediate Speed Control settings are saved when the key switch is turned off. This engine speed will be resumed when the engine is restarted and Intermediate Speed Control is engaged.

Variable Speed
This is set by the calibration and may not be adjustable. When enabled and the ISC 3 switch is selected, the five set points can be used by the operator.

Interaction with other Features and Parameters
When an ISC switch is activated, the operator can also use the Idle Adjustment Switch to increment or decrement the engine speed.
  • Intermediate Speed Control and Cruise Control can not be active at the same time.
  • Variable Speed and Remote Throttle can not be active at the same time.


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