User Guide - Eurotherm Ltda

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nanodac RECORDER/CONTROLLER: USER GUIDEB2.6.9 EFFECT OF CONTROL ACTION, HYSTERESIS AND DEADBAND (Cont.)HYST.CSPHYST.HHeating and cooling typeboth ‘On/Off’.Setpoint = 300°CControl action = RevOP1OP2HEATINGCOOLINGHEATINGHeating hysteresis = 8 °CCooling hysteresis = 10°CHeating off atSP (300°C)Coolingon atSP+ HYST.C(310°C)Coolingoff at SP(300°C)Heatingon atSP- HYST.H(292°C)Heating offat SP(300°C)Figure B2.6.9a Deadband OFFHYST.CD.BANDSPHYST.HHeating and cooling typeboth ‘On/Off’.Setpoint = 300°CControl action = RevOP1OP2HEATINGCOOLINGHEATINGHeating hysteresis = 8 °CCooling hysteresis = 10°CPower deadbandHeating off atSP (300°C)Coolingon atSP+ HYST.C(310°C)Coolingoff atD.BAND(305°C)Heatingon atSP- HYST.H(292°C)Heating offat SP(300°C)Figure B2.6.9b Deadband ON set at 50% of Cooling.Appendix BPage 324HA030554Issue 7 Nov 12
nanodac RECORDER/CONTROLLER: USER GUIDEB2.6.10 Valve nudgeFor systems configured as Unbounded Valve Positioning (VPU) - set up in Loop Setup configuration Ch1(2)control), it is possible to move the valve in small increments towards the open position (Nudge Raise) or towardsthe closed position (Nudge Lower). The trigger for such nudging can be a digital input (e.g. contactclosure) ‘wired’ to the nudge raise or lower parameter, the up or down arrow keys or a command receivedover the serial link.The nudge command causes the valve drive output to drive the valve for either the minimum on time, or foras long as the command is ‘true’, whichever is the longer (note 2). The default minimum on time is 125ms,but this can be edited in the configuration for the relevant output relay (section 4.11.2).Default min ontime125msDefault minon timesMin on time(User value)Min on time(User value)Min on time(User value)Valve driveNudge Raise (Lower)commandDemand < defaultminimumontimeDemand > defaultminimum- on timeDemand < user enteredminimum-ontime. Motor runs forminimum on time.Demand > user-entered minimum-ontime. Motor runs until current minimumontime elapses.Figure B2.6.10 Valve nudge examplesNotes:1. If Ch1 is set to VPU, Nudge operates the channel 1 valve, no matter what Ch2 is set to. If Ch1 isnot set to VPU, and Ch2 is set to VPU then the nudge operates on channel 2 valve.2. The minimum on time is continuously retriggered. This means that if a minimum on time of (say)10 seconds has been configured, then the valve may continue to move for up to 10 secondsafter the command has been removed. That is, it continues until the current minimum on timeperiod has expired.HA030554Issue 7 Nov 12Appendix BPage 325
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User Guide - Eurotherm Ltda

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