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Autotuning Function of SYSDrive 3G3RV Inverter

Autotuning Function of SYSDrive 3G3RV Inverter. Why to Use Autotuning. Inverter needs motor equivalent circuit data for internal calculations to achieve maximium motor performance. 3 ways of getting the motor equivalent circuit data:

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Autotuning Function of SYSDrive 3G3RV Inverter

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  1. Autotuning Function of SYSDrive 3G3RV Inverter Autotuning

  2. Why to Use Autotuning • Inverter needs motor equivalent circuit data for internal calculations to achieve maximium motor performance • 3 ways of getting the motor equivalent circuit data: • Ask the manufacturer – Needs time and often the information is poor • Manually calculation – By using the name plate data the necessary equivalent circuit data can be calculated but it is impractical • Autotuning – only input name plate data, rest is done by inverter • We have now 3 Autotuning modes • Terminal Resistance • Rotating Autotuning • Non Rotating Autotuning Autotuning

  3. Terminal Resistance Tuning Mode • NEW tuning mode • Available in allcontrol modes (V/f, V/f w. PG, Vector) • Inverter detects Terminal Resistance • The Inverter applies a DC voltage to the motor and detects the resulting current. • Terminal Resistance can be calculated easily. • Motor does not rotate while terminal resistance tuning mode. • Result: • By knowing the resistance the motor internal voltage drop and motor temperature influence can be compensated. • When using long motor cables, the voltage drop at the cable resistance can be compensated by the inverter. Autotuning

  4. Rotating Autotuning • Available in Open Loop Vector mode • Inverter determines • Terminal Resistance, • Leakage Inductance • No Load Current • Core Saturation Coefficient • Rated Slip Frequency • Result: • By knowing the exact motor equivalent data the inverter can calculate the Id and Iq values very accurate. • Maximum speed and tourque accuracy can be achieved. • ONE BIG DISADVANTAGE: • The motor is rotating while Autotuning ! Not usable at applications, where load and motor can´t get disconnected Autotuning

  5. Non Rotating Autotuning • NEW tuning mode • Available in Open Loop Vector mode • 2 Parts: Non Rotating Part and Test Mode • Non Rotating Part • Terminal Resistance, • Leakage Inductance • The values for No Load Current and Motor Rated Slip are taken from an inverter internal motor data table (based on Yaskawa standard motors). • Test Mode • First run of the motor with min. 30% of rated speed. Speed agree must be detected. • Real values of No Load Current and Rated Slip are detected during test mode. • Result: • By knowing motor equivalent data Id and Iq can be calculated very accurate. • ADVANTAGE: Motor does not has to rotate while Autotuning ! Autotuning now is performable in almost every case, even if motor and load are coupled Autotuning

  6. How Non Rotating Autotuning Works • I The inverter applies DC voltage to the motor, detects the resulting current and calculates the terminal resistance. • II First 50% of motor rated currend with 15Hz is applied to the motor, after that 50% of rated current with 30 Hz is applied to the motor. Leakage inductance is detected while this procedure. • III Step II is repeated with 100% of motor rated current. • Phase voltages while step II and III: • VU = -½ VW • VV = -½ VW • (phase angle is the same in all 3 phases) • Hence the motor does not rotate. Autotuning

  7. Tuning Accuracy • Rotating Autotuning accuracy • Tuning accuracy according to real motor data: • Non Rotating Autotuning accuracy • Tuning result of rated slip derivates max. +/-20% from rotating tuning result • No load current value derivates max. +/-10% from rotating tuning result • Tuning accuracy according to real motor data: • Requirement for a High Tuning Accuracy • Motor and inverter capacity may derivate not more than one size Autotuning

  8. Summary: • The new Non Rotating Autotuning gives us the opportunity to use Vector Control with a very high performance even at applications, where an Autotuning was not possible in the past. Examples: • Centrifuges • Industrial Washing Machines • Applications with Gear Motors • Sharer Loaders • ... Autotuning

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