PA7300 Instruction Manual - TECO-Westinghouse Motor Company

Reducing Long-cycle OscillationIf oscillation occurs with a longer cycle than the integral time I (Bn-15) settingit means that integral operation is strong. The oscillation will be reduced asthe integral time I is lengthened.ResponseBefore adjustmentAfter adjustmentTimeReducing Short-cycle OscillationIt the oscillation cycle is short and oscillation occurs with a cycleapproximately the same as the derivative time D (Bn-16) setting, it meansthat the derivative operation is strong. The oscillation will be reduced as thederivative time (D) is shortened.If oscillation cannot be reduced even by setting the derivative time (D) to"0.00" (no derivative control), then either lower the proportional gain P (Bn-14)or raise the PID's primary delay time constant (Cn-44).ResponseBefore adjustmentAfter adjustmentTime125