CONTROL GP-ELECTRONIC 3T3964 - Caterpillar

(2WJ)Introduction
New personality modules have been released to update and upgrade 3412 Generator Set Engine parameters. These new personality modules replace former canceled modules. Electronic Technician (ET) version 1.4 or later must be used to access these parameters.Refer to Chart A for a list of new and canceled part numbers.
Do not perform any procedure outlined in this Special Instruction or order any parts until you read and understand this information.
General Accessing And Programming
The following parameters are accessed using Electronic Technician (ET) version 1.4 or later service tool with the software for commercial engines or for truck and commercial engines.
Schematic to configure the system before starting the ET program.* Connect the 7X-1688 Adapter Cable Group between the personal computer and the 7X-1700 Electronic Tool Group.* Connect the 7X-1412 Adapter Cable Assembly between the 7X-1700 Electronic Tool Group and the Electronic Control Module (ECM) of the engine.* Start the ET program.* Select the Configuration menu. * Scroll through the available parameters listing until the specific programmable parameter is found.* To change a parameter value, highlight the current value and press the change button at the lower left portion of the screen.* Type the new value in the dialog box that appears, then select OK.Low Idle
An expanded low idle range is now programmable. The original range for the low idle was 1200 to 1350 rpm. The new range is 600 to 1800 rpm. This greatly expanded range has been added in order to support several applications using a non-Caterpillar generator. The idle should not be set below 1200 rpm when used with a Caterpillar generator due to possible generator voltage regulator shutoff if the unit operates at lower rpm for an extended period of time.High Idle
High idle is the top engine speed with 100 percent throttle (90 percent PWM duty cycle). A new high idle range is now programmable. The original high idle was fixed and not programmable. The new range is 1500 to 2010 rpm for the 50 Hz engines and 1800 to 2412 rpm for the 60 Hz engines. The default value is 1621 rpm for the 50 Hz engines and 1945 rpm for the 60 Hz engines. If the high idle is used with 4P-0319 Governor Control Assembly, the default value MUST be used for proper operation.New Throttle Control Mode (SW IP 1)
A new Throttle Control Mode selectable with AUX CKT (SW IP 1) (Pin 20) customer connector J17) is now available to allow a desired speed input from the programmed low speed to the programmed high idle speed. The default (open or not grounded Pin 20/J17) allows the duty cycle of the PWM signal to the Primary Throttle input (Pin 9/J17) to control the engine speed. The PWM duty cycle will allow the speed to be controlled from 1369 rpm (low idle) to 1945 rpm (high idle) for 60 Hz units, or from 1141 rpm (low idle) to 1621 rpm (high idle) for 50 Hz units.If Pin 20/J17 is grounded, the control will allow the PWM signal to