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2800 Series Remote throttle control ramp rate
This setting determines the rate of change of engine speed in rev/min/s when the raise/lower switch inputs are closed. Changing this parameter requires a customer password. Desired speed input configuration This parameter allows selection of the analogue or PWM external speed control if the remote throttle control is not installed. The Analogue or PWM speed control inputs are normally used with generating set load sharing and synchronising controllers. Changing this parameter requires a customer password. Governor Gain parameters The adjustable Governor Gain parameters are:
l Governor Gain Factor l Governor Minimum Stability Factor l Governor Maximum Stability Notes:
l No engineering units associated with these numbers. l The programmable range is wide for flexibility. The values are valid from 1- 40000. This wide programmable range may not be fully used on any system. Do not expect to use the whole range. Gain Explanations Governor Gain Factor The Governor Gain Factor is multiplied to the difference between desired speed and actual speed.
l If the Governor Gain Factor value is too large, the engine speed can overshoot the desired speed. The overshoot is caused by an overcorrection or a steady state instability.
l If the Governor Gain Factor is too small, the response necessary to accelerate the engine to the desired speed must be obtained by ramping the stability terms to a higher value. This process is time consuming so, as a result, the engine speed is slow to respond. Governor Minimum/Maximum Stability Factor The Stability Factor terms work to eliminate a steady state speed error. There are two gain terms used for stability. If the error is greater than 20 rev/min and the error is increasing, then the Maximum Stability Gain is functioning. If the error is less than 20 rev/min, then the Minimum Stability Gain is used. This function allows the use of a high gain that would otherwise cause the engine to be unstable when the engine is operating near the desired speed.
l If either the Minimum Stability Gain or the Maximum Stability Gain is set too high, the governor will provide more fuel than is necessary to bring the error to zero. The additional fuel will cause the engine speed to overshoot and ring.
l If either the Minimum Stability Gain or the Maximum Stability Gain is set too low, the engine will take too long to arrive at a steady state speed. Tuning Procedure 1 Turn the ECS to the OFF/RESET position. Connect TIPSS-EST and verify that Engine Overspeed Protection is enabled before beginning the tuning process. Engine Overspeed is configured on the Service\Monitoring System screen on TIPSS-EST. Warning! Performing engine governor tuning without engine overspeed protection could result in serious engine damage. Ensure that this parameter is ON while performing this procedure. 2 Start the engine. Observe, on the engine mounted genset control panel, that the engine has reached rated speed. This panel will serve as the speed reference point during this procedure. 3 Enter the Configuration Parameters screen on TIPSS-EST. 4 Determine the desired scenario to tune the engine. For example, is the engine having poor response during specific load assignments or specific load dumps ? Continued Diagnostic Manual, TSL4247, Preliminary
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