PLATE-THRUST 4N6576 - Caterpillar

Engine: 3508B (S/N: 2BM123-UP; 3DM93-UP; 4GM212-UP; 7SM77-UP; 6PN285-UP; 1TW1-UP; 2HW1-UP; 3DW1-UP; 1FZ1-UP) 3512B (S/N: 7HM172-UP; 8EM258-UP; 8RM200-UP; 4TN96-UP; 6WN135-UP; 1PW1-UP; 2GW1-UP; 4AW1-UP; 1GZ1-UP) 3516B (S/N: 6HN156-UP; 7RN463-UP; 8CN144-UP; 8KN143-UP; 9AN121-UP; 1NW1-UP; 2FW1-UP; 3CW1-UP; 1HZ1-UP)Introduction
The Governor Gain Parameters are for the 3500B engines that are listed above. The procedure is for all 3500B engines with Version D electronics.The governor gain parameters are set at the factory. The factory default setting is recommended for most applications. The default settings should allow the engine to respond quickly to transient load changes. The default settings should allow the engine to remain stable during all operating conditions. If the factory default setting does not provide satisfactory performance, the governor gain parameters can be adjusted.The parameters in table 1 can be adjusted.
Table 1
Parameter     Valid Range    
Governor Gain Factor     0 - 14999    
Governor Minimum Stability Factor     0 - 14999    
Governor Maximum Stability Factor     0 - 999    Note: No engineering units are associated with the numbers in table 1.Note: The range of the programmable setting is wide for flexibility. Do not expect to use the whole range. If the programmable setting is greater than the valid range, the system will revert to the factory default value.Do not perform any procedure in the Special Instruction until you read this information and you understand this information.Gain Explanations
Governor Gain Factor
The Governor Gain Factor is multiplied by the engine speed error. This value is derived by calculating the difference between the desired speed and the actual speed.
If the Governor Gain Factor value is too large, the engine speed can overshoot the desired speed.
If the Governor Gain Factor value is too small, the engine will accelerate slowly.Governor Minimum/Maximum Stability Factor
The Governor Minimum Stability Factor functions in order to eliminate steady state speed error. The Governor Maximum Stability Factor functions in order to eliminate steady state speed error. The Governor Minimum Stability Factor is used by the ECM when the steady state speed error is less than 20 rpm. The Governor Maximum Stability Factor is used by the ECM when the steady state speed error is increasing and the engine speed error is greater than 20 rpm.
If the Governor Minimum Stability Factor or the Governor Maximum Stability Factor is set too high, the ECM will provide additional fuel. The additional fuel will cause the engine speed to overshoot. The additional fuel will also cause the engine speed to oscillate.
If the Governor Minimum Stability Factor or the Governor Maximum Stability Factor is set too low, the engine will not achieve a steady state operation quickly.Tuning Procedure
Turn the ECS to the COOLDOWN/STOP position. Connect the electronic technician. Ensure that engine overspeed protection is enabled before beginning the adjustment procedure. Adjusting Governor Gain Parameters without engine overspeed protection can result in serious engine damage. Ensure that engine overspeed protection is ON. Engine overspeed is configured on the setup screen of Service Monitoring System in electronic technician.
Personal injury or death can result from engine overspeed.If the engine