Danfoss VLT AutomationDrive FC 300 Programming Manual

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Danfoss VLT AutomationDrive FC 300 Programming Manual Manual pdf 129 page image

3.9 Parameters: Controllers3.9.1 7-** ControllersParameter group for configuring application controls.3.9.2 7-0* Speed PID Ctrl.Parameters for configuring the speed PID control.7-00 Speed PID Feedback SourceOption: Function:Select the encoder for closed loop feedback.The feedback may come from a different encoder (typically mounted on the application itself) thanthe motor mounted encoder feedback selected in par. 1-02Flux Motor Feedback Source.This parameter cannot be adjusted while the motor is running.[0] * Motor feedb. P1-02[1] 24V encoder[2] MCB 102[3] MCB 103[5] MCO Encoder 2[6] Analog input 53[7] Analog input 54[8] Frequency input 29[9] Frequency input 33NB!If separate encoders are used (FC 302 only) the ramp settings parameters in the following groups: 3-4*, 3-5*, 3-6*, 3-7* and 3-8*must be adjusted according to the gear ratio between the two encoders.7-02 Speed PID Proportional GainRange: Function:Applicationdependent*[0.000 - 1.000 ] Enter the speed controller proportional gain. The proportional gain amplifies the error (i.e. the de-viation between the feedback signal and the set-point). This parameter is used withpar. 1-00Configuration Mode Speed open loop [0] andSpeed closed loop [1] control. Quick controlis obtained at high amplification. However if the amplification is too great, the process may becomeunstable.Use this parameter for values with three decimals. For a selection with four decimals, usepar. 3-83Quick Stop S-ramp Ratio at Decel. Start.7-03 Speed PID Integral TimeRange: Function:Applicationdependent*[2.0 - 20000.0 ms] Enter the speed controller integral time, which determines the time the internal PID control takesto correct errors. The greater the error, the more quickly the gain increases. The integral time causesa delay of the signal and therefore a dampening effect, and can be used to eliminate steady statespeed error. Obtain quick control through a short integral time, though if the integral time is tooshort, the process becomes unstable. An excessively long integral time disables the integral action,leading to major deviations from the required reference, since the process regulator takes too longto regulate errors. This parameter is used withSpeed open loop [0] andSpeed closed loop [1]control, set in par. 1-00Configuration Mode.3 Parameter descriptions FC 300 Programming Guide128 MG.33.M8.02 - VLT® is a registered Danfoss trademark3