User Guide - Eurotherm Ltda

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nanodac RECORDER/CONTROLLER: USER GUIDE4.7.8 Advanced Loop Output menuAppendix B section B2.6 contains details of the output functions.Advanced Loop.OutputOutput HighOutput LowCh1 OutputCh2 OutputCh2 DeadbandRateRate DisableCh1 Travel TimeCh2 Travel TimeCh1 Pot PosCh1 Pot BrkCh2 Pot PosCh2 Pot BrkPot Brk ModeSbrk ModeSbrk OPSafe OPManual ModeManual OutputForced OutputManual StartupPff EnLine VoltageCool TypeFF TypeFF GainFF OffsetFF Trim Limit’FF RemoteFF OutputTrack OutputTrack EnableRem. Output LowRem. Output High100 %-100 %0.00.0Off15No22.0 sec22.0 sec0Off0OffRaiseSafe0.0 %0.0 %Track0.0 %0.0 %Yes218 VLinearSP1.00001000 %0Off-100 %100 %Figure 4.7.8 Advanced Loop Output menuPage 120HA030554Issue 7 Nov 12
nanodac RECORDER/CONTROLLER: USER GUIDE4.7.8 Advanced Loop Output Menu (Cont.)Output HighOutput LowCh1 OutputCh2 OutputCh2 DeadbandRateRate DisableCh1 Travel TimeCh2 Travel TimeCh1 Pot Pos*Ch1 Pot Brk*Ch2 Pot Pos*Ch2 Pot Brk*Pot Brk Mode*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 and can even cause it to fail to achieve setpoint.The minimum power, or the maximum ‘negative’ (i.e. cooling) power to be delivered bythe system.Displays the positive power values used by the heat output.Displays 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.The Output Rate limit may be disabled by setting its value to 0.0. Alternatively, for someapplications it is useful to be able to wire to the Output Rate Disable so that ‘Rate’ canbe switched on/off during stages of the process. For example, Rate Disable can beused with the programmer event outputs to control the output rate of change during aparticular segment.Appears only if Setup menu parameter ‘Slave Channel 1’ is set to ‘VPB’. This is the valvetravel time from closed (0%) to open (100%). In a valve positioning application, channel1 output is connected by a single software ‘wire’ to a Valve Raise/Valve Lower relay 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 ‘Slave Channel 2’ is set to ‘VPB’ . This is the valvetravel time from closed (0%) to open (100%). For heat/cool applications, channel 2 isassociated with the cooling valve. Valid entries: 0.0 to 1000.0 seconds.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. This does not meanthat the potentiometer can be omitted with VPB, as the accuracy of valve position controlis reduced without it.* Note: These parameters appear only if the ‘Setup’ menu parameter ‘Slave Channel 1’ or ‘SlaveChannel 2’ (as appropriate) is set to ‘VPB’. The Setup menu is described in Section 4.7.2.SBrk Mode Defines the action to be taken in the event of a sensor break.Safe: The output adopts the value configured in ‘Sbrk OP’, below.Hold: The output remains at its current level.Sbrk OPThe value to be output if a Slave sensor break occurs, and SBrk Mode (above) is set to‘Safe’.Safe OP The output level adopted when the loop is inhibited (Main menu Section 4.7.1).HA030554Issue 7 Nov 12Page 121
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User Guide - Eurotherm Ltda

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