User Guide - Eurotherm Ltda

nanodac RECORDER/CONTROLLER: USER GUIDE4.6.6 Output menu itemsAppendix B section B2.6 contains details of the output functions.Output LowOutput HighCh1 OutputCh2 OutputCh2 DeadbandRateCh1 OnOff HystCh2 OnOff HystCh1 Travel TimeCh2 Travel TimeNudge RaiseNudge LowerCh1 Pot Pos*Ch1 Pot Brk*Ch2 Pot Pos*Ch2 Pot Brk*Pot Brk Mode*The minimum power, or the maximum ‘negative’ (i.e. cooling) power to be delivered bythe system. The valid input range is -100% and Output High.The maximum output power to be delivered by channels 1 and 2, where 100% is fullpower. The valid input range is Output Low to 100.0%. Reducing this value reducesthe rate of change of the process, but it also reduces the controller’s ability to react toperturbations.Displays the positive power values used by the heat output. Values range from Outputlow to Output highDisplays the cooling power values for channel two. Appears as a value between Outputhigh and -100%, where -100% represents full cooling power.A gap (in %) between output 1 switching off, and output 2 switching on, and vice-versa.Valid inputs are 0 (off) to 100%.Limit on the rate at which the output from the PID can change. Can be useful in preventingrapid changes in output that could damage the process, heater elements etc.Appears only if ‘Ch1 Control’ has been set to ‘OnOff’ in the Setup menu. Allows the userto enter a hysteresis value for channel one. Valid entries are 0.0 to 200.0.Appears only if ‘Ch2 Control’ has been set to ‘OnOff’ in the Setup menu. Allows the userto enter a hysteresis value for channel two. Valid entries are 0.0 to 200.0.Appears only if Setup menu parameter ‘Ch1 Control’ is set to ‘VPB’ or ‘VPU’. This is thevalve travel time from closed (0%) to open (100%). In a valve positioning application,channel 1 output is connected by a single software ‘wire’ to a Valve Raise/Valve Lowerrelay pair. For heat/cool applications, channel 1 is associated with the heating valve.Valid entries: 0.0 to 1000.0 seconds.Appears only if Setup menu parameter ‘Ch2 Control’ is set to ‘VPB’ or ‘VPU’. This is thevalve travel time from closed (0%) to open (100%). For heat/cool applications, channel2 is associated with the cooling valve. Valid entries: 0.0 to 1000.0 seconds.Appears only if Setup menu parameter ‘Ch1 Control’ or Ch2 Control is set to ‘VPU’.If set to ‘Yes’, the valve can be moved towards the open position by, for example, a contactclosure, an up arrow button operation or a serial communications command. Thedefault minimum nudge time is 125 ms, but this can be edited in the relevant relay configuration- see Section 4.11.1. See also Section B2.6.10 for more ‘Nudge’ details.As for ‘Nudge Raise’, above but moves the valve towards the closed position.The position of the channel one actuator as measured by the feedback potentiometer.‘On’ indicates that the input to the relevant channel is open circuit.The position of the channel two actuator as measured by the feedback potentiometer.‘On’ indicates that the input to the relevant channel is open circuit.Defines the action to be taken if a potentiometer break is detected:Raise: opens the valveLower: closes the valveRest: the valve remains in its current state.Model: the controller tracks the position of the valve and sets up a model of the systemso that it continues to function if the potentiometer becomes faulty.* Note: These parameters appear only if the ‘Setup’ menu parameter ‘Ch1 Control’ or ‘Ch2 control’(as appropriate) is set to ‘VBP’. The Setup menu is described in Section 4.6.2.HA030554Issue 7 Nov 12Page 103