Baker Hughes Masoneilan SVi 1000 Instruction Manual

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Baker Hughes Masoneilan SVi 1000 Instruction Manual Manual pdf 56 page image

© 2017 Baker Hughes, a GE company, LLC. All rights reserved.56 | BHGETroubleshooting AutotuneAutotune, whether using ValVue, pushbuttons (presets), a DD or a handheld, is the best way totune the valve. If it does not work:Step OneAutotune again using recommended tuning parameters for the valve is use. The SVi1000 DTMhelp offers you instructions in how to enter these parameters in the Autotune procedure.Alternately, Try starting tuning from the 50% position. Table 6 outlines some effects ofparameter changes.Step TwoRun autotune again after ensuring the:Other Issues That Affect AutotuneValve oscillating fast: P term too high: reduce P by ½ and try again Booster too hot (aggressive) open by-pass on booster and try againValve oscillation slow - friction: Increase I term by 20-25% Add Dead Zone – try 0.25%Table 6 Rough Guide to Effect s of Changing PID ValuesParameter Rise Time Overshoot Settling TimeIncrease Value Decrease Value Increase Value Decrease Value Increase Value Decrease ValueP Decrease Increase Increase Decrease Small Effect Small EffectI Small Effect Small Effect Decrease Increase Decrease IncreaseD Small Effect Small Effect Decrease Increase Decrease Increase Air supply is sufficient and there are no air leaks. Valve does not have excessive friction.Add some Dead Zone (0.25). Linkage is not loose or in an improper position. Mounting is installed correctly. Alarms are cleared. Magnet is not out of position. Boosters are not too aggressive. Solenoid in supply line should have a Cv that is.25 or higher.