Danfoss VLT AutomationDrive FC 300 Design Manual

Also see for VLT AutomationDrive FC 300: Instruction manual Operating instructions Design guide Service manual Operating instructions

Contents

Danfoss VLT AutomationDrive FC 300 Design Manual Manual pdf 39 page image

Function Parameter no. SettingSet acceptable limits for the motor speed and frequency. 4-11 Motor Speed LowLimit [RPM]4-13 Motor Speed HighLimit [RPM]4-19 Max OutputFrequency0 RPM (default)1500 RPM (default)60 Hz (default 132 Hz)4) Configure the speed control and select the motor control principle.Activation of Speed Control. 1-00 Configuration Mode [1] Speed closed loopSelection of Motor Control Principle. 1-01 Motor ControlPrinciple[3] Flux w motor feedb5) Configure and scale the reference to the speed control.Set up analog Input 53 as a reference Source. 3-15 Reference Resource 1 Not necessary (default)Scale analog Input 53 0 RPM (0 V) to 1500 RPM (10 V). 6-1* Analog Input 1 Not necessary (default)6) Configure the 24 V HTL encoder signal as feedback for the motor control and the speed control.Set up digital input 32 and 33 as encoder inputs. 5-14 Terminal 32 DigitalInput5-15 Terminal 33 DigitalInput[0] No operation (default)Choose terminal 32/33 as motor feedback. 1-02 Flux Motor FeedbackSourceNot necessary (default)Choose terminal 32/33 as speed PID feedback. 7-00 Speed PID FeedbackSourceNot necessary (default)7) Tune the speed control PID parameters.Use the tuning guidelines when relevant, or tunemanually.7-0* Speed PID Ctrl See 3.4.5 Tuning Speed PID Control8) Finished.Save the parameter setting to the LCP. 0-50 LCP Copy [1] All to LCPTable 3.8 Programming Order3.4.5 Tuning Speed PID ControlThe following guidelines are relevant when using one ofthe flux motor control principles in applications where theload is mainly inertial (with a low amount of friction).The value of 30-83 Speed PID Proportional Gain isdependent on the combined inertia of the motor and load.The selected bandwidth can be calculated using thefollowing formula:Par. 7 − 02 =Total inertia kgm 2x par. 1 − 25Par. 1 − 20x 9550x Bandwidth rad /sNOTICE1-20 Motor Power [kW] is the motor power in kilowatts.For example, enter ‘4’ kW instead of ‘4000’ W in theformula.A practical value for the bandwidth is 20 rad/s. Check theresult of the 30-83 Speed PID Proportional Gain calculationagainst the following formula. This is not required if usinga high resolution feedback such as a SinCos feedback.Par. 7 − 02MAX = 0.01x 4x Encoder Resolution x Par. 7 − 062x πx Max torque ripple %A good starting value for 7-06 Speed PID Lowpass FilterTime is 5 ms. A lower encoder resolution calls for a higherfilter value. Typically a max torque ripple of 3% isacceptable. For incremental encoders, the EncoderResolution is found in either 5-70 Term 32/33 Pulses PerRevolution (24 V HTL on standard drive) or 17-11 Resolution(PPR) (5 V TTL on MCB102 Option).Generally the practical maximum limit of 30-83 Speed PIDProportional Gain is determined by the encoder resolutionand the feedback filter time, but other factors in theapplication might limit the 30-83 Speed PID ProportionalGain to a lower value.To minimise the overshoot, 7-03 Speed PID Integral Timecould be set to approx. 2.5 s. Time varies with theapplication.7-04 Speed PID Differentiation Time should be set to 0 untileverything else is tuned. If necessary, finish the tuning byadjusting this setting in small increments.Product Introduction VLT® AutomationDrive FC 300 Design Guide 90-1200 kWMG34S202 - Rev. 2013-08-19 373 3