SLLU335A August   2021  – January 2022 MCF8316A

 

  1. 1Revision History
    1.     Trademarks
  2. 2Introduction
    1. 2.1 Hardware and GUI Setup
      1. 2.1.1 Jumper Configuration
      2. 2.1.2 External Connections
      3. 2.1.3 Connecting to the GUI
        1. 2.1.3.1 Connect to computer
        2. 2.1.3.2 Connect to the GUI
        3. 2.1.3.3 Verify Hardware Connection
  3. 3Essential Controls
    1. 3.1 Recommended Default Values
    2. 3.2 Device and Pin Configuration
      1. 3.2.1 Speed Input Mode
    3. 3.3 Control Configuration - Motor Parameters
      1. 3.3.1 Maximum Motor Electrical Speed (Hz)
    4. 3.4 Control configuration - Closed Loop
      1. 3.4.1 Current Limit for Torque PI Loop
    5. 3.5 Testing for Successful Startup into Closed Loop
    6. 3.6 Fault Handling
      1. 3.6.1 MPET IPD Fault [MPET_IPD_Fault]
      2. 3.6.2 MPET BEMF Fault [MPET_BEMF_Fault]
      3. 3.6.3 Abnormal BEMF Fault [ABN_BEMF]
      4. 3.6.4 Lock Current Limit [LOCK_LIMIT]
      5. 3.6.5 Hardware lock Current Limit [HW_LOCK_LIMIT]
      6. 3.6.6 No Motor Fault [NO_MTR]
  4. 4Basic Controls
    1. 4.1 Device and Pin Configuration
      1. 4.1.1 Power Saver or Sleep Mode for Battery Operated Applications
      2. 4.1.2 Direction and Brake Pin Override
    2. 4.2 System Level Configuration
      1. 4.2.1 Tracking Motor Speed Feedback in Real Time
      2. 4.2.2 Improving Acoustic Performance
      3. 4.2.3 Protecting the Power supply
      4. 4.2.4 Monitoring Power Supply Voltage Fluctuations for Normal Motor Operation
    3. 4.3 Control Configurations
      1. 4.3.1  Motor Parameter Estimation to Minimize Motor Parameter Variation Effects
      2. 4.3.2  Initial Speed Detection of the Motor for Reliable Motor Resynchronization
      3. 4.3.3  Unidirectional Motor Drive Detecting Backward Spin
      4. 4.3.4  Preventing Back Spin of Rotor During Startup
      5. 4.3.5  Faster Startup Timing
      6. 4.3.6  Gradual and Smooth Start up Motion
      7. 4.3.7  Improving Speed Regulation
      8. 4.3.8  Stopping Motor Quickly
      9. 4.3.9  Preventing Supply Voltage Overshoot During Motor Stop.
      10. 4.3.10 Protecting Against Rotor Lock or Stall Condition
      11. 4.3.11 Maximizing Thermal Efficiency and Increasing Thermal Performance
      12. 4.3.12 Mitigating Electromagnetic Interference (EMI)
      13. 4.3.13 Faster deceleration

3.5 Testing for Successful Startup into Closed Loop

  1. Apply a nonzero speed command

    1. If the Speed input mode is I2C, change the “I2C Speed Command Percentage” to a non-zero value. Once the speed command is issued, the device will start commutating and the motor should start spinning that is proportional to the I2C Speed Command Percentage.

    2. If the speed input mode is Analog, rotate the Speed Control potentiometer (R4) clockwise to control the motor speed. Once the speed command is issued, the device will start commutating and the motor should start spinning that is proportional to the voltage on the Speed Pin.

    3. If the speed input mode is PWM, apply PWM signal to the speed pin with a given duty cycle with a low of 0 V to a high of 2.2 V (min). Once the speed command is issued, the device will start commutating and the motor should start spinning that is proportional to the duty cycle.

  2. Wait for MPET to estimate motor electrical parameters.

    The Motor Parameter Extraction Tool (MPET) will attempt to measure the motor resistance, inductance, and Motor BEMF constant (Ke) and populate these parameters automatically during the initial position detect (IPD) and open loop stage as the rotor speed attempts to accelerate. It usually takes around 10-15 seconds to estimate motor resistance, inductance and Motor BEMF constant Ke.

  3. Check if motor spins in closed loop at commanded speed.

    In closed loop, the motor should spin at the commanded speed and there should not be any faults triggered.

    1. Enable the “Auto read fault status” toggle button towards the top right corner of the GUI. Then monitor the Fault Status in the side panel to the right.

    If no fault gets triggered, skip Section 3.6 and proceed to Section 4.

  4. Prepare device for fault handling if any fault gets triggered.

    If the motor failed to spin successfully in closed loop, check the fault status.

    1. Set zero speed command by turning off the PWM, turning the potentiometer completely counterclockwise, or setting the I2C command percentage to 0%.

    2. Clear the fault status registers by clicking on the “Clear” button in the Fault Status side panel to the right as shown in Figure 3-1

    Check Section 3.6 for steps to debug faults.

This completes the essential controls section. At the end of this section, user should be able to spin the motor in closed loop. Save the register settings by clicking File->Save Registers in the GUI. If there were no faults, skip to Section 4.

GUID-20210609-CA0I-JBD1-RR9D-X3W8ZPMGWJSG-low.pngFigure 3-1 Fault Status