User Guide - Eurotherm Ltda

nanodac RECORDER/CONTROLLER: USER GUIDE4.7.3 Advanced Loop Tune Menu (Cont.)BandTimeoutOPDelWSPModeManOPMasterTuneTuneSlaveTune StatusMod_PVMod_OPArg_PVArg_OPGainPhasePeriodA1A2Alpha_pOPssAlphaDebugCycleNoHA030554Issue 7 Nov 12This defines the band between which the setpoint of the slave controller will beswitched during the master autotune oscillation. It is set as a % of the master PV (HighRange - Low Range) in engineering units being +/- Band/2 about the tuning setpoint.The actual values applied to the slave may actually be constrained inside this band bythe wind-up control mechanismDefines the maximum time permitted for each stage of the master tuning.This is an internal setting of the order of 0.5 during tuning.This is the actual setpoint around which the autotuning oscillation of the master takesplace. It is used for the calculations associated with the Hysteresis and Band parameters.This parameter is used by the master autotune algorithm to communicate with the masterloop. Puts master controller into ‘Not-Auto’ modeThis signal is generated within the master loop during the autotune oscillation. It is usedonly as an input to the calculations which generate the slave loop setpoint. It is not theoverall loop output to the load which at all times is under the control of the slave PIDcalculations.Master tune in progressThe autotune process is requesting a slave tune.This indicates the internal stage of tuning.0 = Not tuning 1 = Tuning the slave2 = Tuning the master 3 = Tuning completed-1 = Tuning has aborted or timed-outThis is the amplitude of the fundamental component of the master PV during the lastcycle of the tuning oscillation.This is the amplitude of the fundamental component of the master OP during the lastcycle of the tuning oscillation.This is the argument (phase) of the fundamental component of the master PV during thelast cycle of the tuning oscillation. Value in radians.This is the argument (phase) of the fundamental component of the master OP duringthe last cycle of the tuning oscillation. Value in radians.This is the gain between the master OP and the master PV over the path via the slaveloop and the load, measured at the fundamental frequency of the autotuning oscillation.The phase shift in radians between the master OP and the master PV over the path viathe slave loop and the load, measured at the fundamental frequency of the autotuningoscillationThis is the period of the last cycle of the autotune oscillation, in seconds.This is the number of samples actually taken in order to determine the fundamentalcomponents of the master PV and OP. The target number is around 100 samples butthe actual number taken may differ slightly from this depending on the load's behaviour.The A2 parameter is a used for diagnostic purposes. Its value indicates the designmethod chosen by the algorithm which depends on the characteristics of the mastertuning oscillation and the measured values of frequency, gain, and phase shift aroundthe master loop. This influences the choices of the P, I and D values set into the masterloop.R2GPD tuning diagnostic parameter: Heat time / cool time.R2GPD tuning diagnostic parameter: Steady state output at the end of the settling period.R2GPD tuning diagnostic parameter: 1/R2G.R2GPD tuning diagnostic parameter: 0-PID, 1-PI, 2-PD, 3-P.R2GPD tuning diagnostic parameter: Number of cycles in auto tune sequence.Page 111