DUCT AS-AIR 2843518 - Caterpillar

Introduction
This chapter contains information on control calibration. It includes initial prestart-up and start-up settings and adjustments.
An improperly calibrated control could cause an engine overspeed or other damage to the engine. To prevent possible serious injury from an overspeeding engine, read this entire procedure before starting the engine.
Start-up Adjustments
1. Complete the installation checkout procedure in Chapter 3 and the prestart menu settings in Chapter 4.2. Close the Minimum Fuel (Run/Stop) contact. Open the Failed Speed Signal Override contact. Be sure the Idle/Rated contact is in idle (open). Apply power to the control. Do NOT proceed unless the green POWER AND CPU OK indicator on the front of the control is on.3. Check the speed sensor. Minimum voltage required from the speed sensor to operate the control is 1.0 Vrms, measured at cranking speed or the lowest controlling speed. For this test, measure the voltage while cranking, with the speed sensor connected to the control. Before cranking, be sure to prevent the engine from starting. At 5% of rated speed and 1.0 Vrms, the failed speed sensing circuit function is cleared. If the red Alarm #1 indicator remains on, shut down the engine.
TO PROTECT AGAINST POSSIBLE PERSONAL INJURY, LOSS OF LIFE, and/or PROPERTY DAMAGE WHEN STARTING THE ENGINE, BE PREPARED TO MAKE AN EMERGENCY SHUTDOWN to protect against runaway or overspeed should the mechanical-hydraulic governor(s), or electric control(s), the actuator(s), fuel control(s), the driving mechanism(s), the linkage(s), or the controlled device(s) fail.
4. Start the engine. If there is insufficient fuel to start the engine, increase the Idle Fuel Limit (Menu 6). (The control will reduce fuel as required when the speed setting is reached. It requires extra fuel to accelerate the engine to idle speed.) It may take a few starts to determine the final setting of the Idle Fuel Limit. If the start time is excessive, increase the Idle Fuel Limit. If the start time is too fast or flooding is occurring, decrease the Idle Fuel Limit. We recommend trying both hot and cold starts to determine a final setting.5. Adjust for stable operation. If the engine is hunting at a rapid rate, slowly decrease the Gain (Menu 1) until performance is stable. If the engine is hunting at a slow rate, increase the Stability time. If increasing the Stability time does not stabilize the engine, it also may be necessary to slowly decrease the Gain OR to slowly decrease the Gain and increase the Compensation.This completes the start-up adjustments. We recommend saving the settings at this time by pressing the "SAVE" key on the Hand Held Programmer.Dynamic Adjustments
The objective of the dynamic adjustments is to obtain the optimum, stable engine speed response from minimum speed/load to full speed and load. All adjustments apply to both standard dynamics (Circuit Breaker Aux contact open) and