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Use of GUI and stand-alone software AC motor section STMicroelectronics 1 Contents • • • Install software & setup the environment • Stand alone Start GUI & jumper setting Set motor parameter (type, control mode, V/F curve, startup settings, real-time settings) ® 2 Requirements • • • • • • Starter kit with ST7MC on board Indart board connected to PC with usb 2.0 cable ICC isolation board AC power supply AC motor GUI software ® 3 Setup environment • • To use GUI the starter kit must be connected through an Indart board with a PC. ICC isolator must be used to avoid high voltage present in the starter kit to damage the PC. Tacho Starter Kit ST7MC AC Source Motor Phases Flat cable PC • • USB cable Indart ICC isolator Motor is connected to the starter kit by phase lines and tacho sensor. Setting of the Voltage provide by AC source is based on motor characteristics. ® 4 Starting GUI & Starter Kit jumper setting • Start the GUI and select the 3-Phase AC Induction Motor • Jumper Setting for AC Induction Motor ¾ ¾ ¾ ¾ ¾ • S1 on 35V Only W13 Closed (Tacho input) W14,W15 (in hall sensor position) W16 Open J8 (1-2,3-4,…,7-8) all jumper closed After jumper setting the starter kit can be powered on ® 5 • Motor type GUI Settings We can set the Selni induction motor (default setting) or other 3-Phase motor Selni motor characteristics • 230 V AC Induction Motor • 1 Poles Pair • Tacho sensor periods per revolution 8 ® 6 GUI Settings • Other 3-phase induction motor If we choose other motor we must set: • The number of poles pair (1 or 2) • The (eventually) tachometer periods per revolution ® 7 Speed regulation • Speed regulation can be done in open loop or closed loop. ® 8 Open loop settings In open loop speed regulation we set the stator frequency and the voltage amplitude If we check the ratio button the voltage amplitude is set according to V/F Curve. Otherwise is set by the Voltage edit box We can read the reported frequency read by Tacho sensor and the Slip ® Speed can be expressed in Hz or in RPM 9 Closed loop settings A PI regulator, with constant slip control, is used to perform the regulation in closed loop. We can set the Integral Coefficient (Ki), Proportional Coefficient (Kp) and the regulator Sampling Time In closed loop speed regulation we set the Target Rotor Frequency and the Slip Frequency ® • The slip value to be entered here should be the slip giving optimum efficiency for the given target rotor frequency and motor characteristics. The PI will adjust the stator voltage and frequency according to this slip frequency, the target frequency and the V/F curve. 10 V/F Curve We can set Min Voltage, High or Low Frequency.. This curve fix the relation between Voltage Amplitude and Stator Frequency to avoid the break down zone of the motor. Min Voltage Low Freq. High Freq. ® • This curve is divided in three zones. One from 0 to Low Frequency where the Voltage amplitude is fixed to Min Voltage. One from Low to High Frequency where the Voltage follow a linear increasing behavior from Min Voltage to 255. The last zone where the frequency is over the High Frequency where the voltage is fixed to 255. • The amplitude parameter voltage run from 0 to 255 and indicate the duty cycle max in the generated sine wave signal. A value of 255 mean a sine wave signal generated with amplitude equal to mains (230 Volts) 11 Start-Up Settings Soft start Open Loop Closed Loop Time laps between two voltage increments (1/255) Through V/F curve Voltage Voltage Max duration Max duration In this point rotor frequency reach Min rotor frequency to validate closed loop The Max duration is the product of Voltage and Slew Rate ® In both case the Stator Frequency is imposed during the Soft Start 12 Advanced settings Frequency of PWM outputs Sets the min/max values for the stator frequency. Indicates what action to be performed after STOP order • Free Wheeling: upon stop order This sets the dead time-between high and low side switches to avoid cross conduction motor will continue spinning freely • DC Current Braking: active breaking to stop motor quickly ® During DC Current Braking two of the three bridge legs are grounded and a complementary PWM with duty cycle of “Brake level” (maximum 50%) is applied on the switches of the third leg. After “Brake time” the motor is free wheeling. 13 Save the setting & start motor The setting can be saved and restored next time During run time, some parameter, like Rotor Speed, Slip Frequency and the reported voltage applied, can be read from GUI. On the right side there is some indicator to indicate some failures. When push “Start” the GUI stores the program and the parameter on the Microcontroller and start to run the motor ® • With the indicator on the right side of the Feedback group we can monitor the status of Power Stage: • Over temperature, over current or bus over-voltage • and we can monitor the motor status • Startup fails or Motor Stalled 14 Stand Alone Compilator: Cosmic, Hiware GUI Settings relative to the application + Software library Starter Kit ST7MC Software library is common for all AC induction motor application Motor Stand Alone ® When we press the “Generate *.H files” button the GUI create config.h and MTCParam.h, with the current settings used, to be included into software AC induction motor library to make an executable stand alone software that can be used without connection with the PC. 15