SLVUCC2 October   2021 MCT8316A

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Hardware Setup
      1. 1.1.1 Jumper Configuration
      2. 1.1.2 External Connections
  3. 2Quick Tuning
  4. 3Comprehensive Tuning
    1. 3.1 Cycle by cycle current limit
      1. 3.1.1 Selecting ILIMIT Pin Resistor
    2. 3.2 Motor Startup Settings
      1. 3.2.1 Motor Startup Profile
      2. 3.2.2 Motor startup method
        1. 3.2.2.1 Initial Position detect (IPD)
        2. 3.2.2.2 Double align
      3. 3.2.3 Selecting RMP_1 and RMP_2 Pin Resistors
    3. 3.3 Abnormal Speed Threshold
      1. 3.3.1 Selecting CONFIG_3 Pin Resistor
    4. 3.4 PWM Switching Frequency
      1. 3.4.1 Selecting CONFIG_1 Pin Resistor
    5. 3.5 Lead Angle
      1. 3.5.1 Steps to Tune Lead Angle
      2. 3.5.2 Selecting LDANGLE pin resistor
    6. 3.6 Slew Rate and Buck Voltage
      1. 3.6.1 Selecting SLEW_RATE Pin Resistor
  5. 4Revision History

3.2.1 Motor Startup Profile

Motor startup profile is chosen based on the inertia profile of the motor-load system. Inertia profiles range from ultra-high inertia to ultra-high acceleration. Table 3-2 provides the end equipment examples for all the motor startup profile. Select the appropriate motor startup profile that closely matches to your application.

Table 3-2 End Equipment Example for Motor Startup Profile

Motor startup profile

End equipment
Ultra-high inertia

Ceiling fan
Very high inertia

Pedestal fan
High inertia Blowers
Low acceleration
Medium acceleration Appliances pumps
High acceleration Robotic vacuum suction motor
Very high acceleration
Ultra-high acceleration Fuel pumps

Table 3-3 shows the default motor startup parameters for ultra-high inertia.

Table 3-3 Default Motor Startup Parameters for Ultra-High Inertia

Parameter

Value

Unit

Align ramp rate (ALIGN_RAMP_RATE)

10

V/s

CLosed loop acceleration (CL_ACC)

1

V/s

Open loop duty cycle (OL_DUTY)

15

%

Open loop acceleration (OL_ACC_A1)

0.005

 Hz/s
Startup brake time (STARTUP_BRK_TIME)

5000

 ms
Slow first cycle frequency (SLOW_FIRST_CYC_FREQ)

0.01

Hz
Align time (ALIGN_TIME)

6000

ms
Dynamic degauss (DYN_DEGAUSS_EN)

Disabled

-

Table 3-4 shows the default motor startup parameters for very-high inertia.

Table 3-4 Default Motor Startup Parameters for Very High Inertia

Parameter

Value

Unit

Align ramp rate (ALIGN_RAMP_RATE)

10

V/s

CLosed loop acceleration (CL_ACC)

5

V/s

Open loop duty cycle (OL_DUTY)

15

%

Open loop acceleration (OL_ACC_A1)

0.05

 Hz/s
Startup brake time (STARTUP_BRK_TIME)

1000

 ms
Slow first cycle frequency (SLOW_FIRST_CYC_FREQ)

0.05

Hz
Align time (ALIGN_TIME)

4000

ms
Dynamic degauss (DYN_DEGAUSS_EN)

Disabled

-

Table 3-5 shows the default motor startup parameters for high inertia.

Table 3-5 Default Motor Startup Parameters for High Inertia

Parameter

Value

Unit

Align ramp rate (ALIGN_RAMP_RATE)

100

V/s

CLosed loop acceleration (CL_ACC)

15

V/s

Open loop duty cycle (OL_DUTY)

20

%

Open loop acceleration (OL_ACC_A1)

1

 Hz/s
Startup brake time (STARTUP_BRK_TIME)

500

 ms
Slow first cycle frequency (SLOW_FIRST_CYC_FREQ)

0.25

Hz
Align time (ALIGN_TIME)

2000

ms
Dynamic degauss (DYN_DEGAUSS_EN)

Disabled

-

Table 3-6 shows the default motor startup parameters for low acceleration.

Table 3-6 Default Motor Startup Parameters for Low Acceleration

Parameter

Value

Unit

Align ramp rate (ALIGN_RAMP_RATE)

100

V/s

CLosed loop acceleration (CL_ACC)

25

V/s

Open loop duty cycle (OL_DUTY)

20

%

Open loop acceleration (OL_ACC_A1)

1

 Hz/s
Startup brake time (STARTUP_BRK_TIME)

500

 ms
Slow first cycle frequency (SLOW_FIRST_CYC_FREQ)

0.25

Hz
Align time (ALIGN_TIME)

2000

ms
Dynamic degauss (DYN_DEGAUSS_EN)

Disabled

-

Table 3-7 shows the default motor startup parameters for medium acceleration.

Table 3-7 Default Motor Startup Parameters for Medium Acceleration

Parameter

Value

Unit

Align ramp rate (ALIGN_RAMP_RATE)

500

V/s

CLosed loop acceleration (CL_ACC)

75

V/s

Open loop duty cycle (OL_DUTY)

25

%

Open loop acceleration (OL_ACC_A1)

25

 Hz/s
Startup brake time (STARTUP_BRK_TIME)

100

 ms
Slow first cycle frequency (SLOW_FIRST_CYC_FREQ)

0.5

Hz
Align time (ALIGN_TIME)

500

ms
Dynamic degauss (DYN_DEGAUSS_EN)

Enabled

-

Table 3-8 shows the default motor startup parameters for high acceleration.

Table 3-8 Default Motor Startup Parameters for High Acceleration

Parameter

Value

Unit

Align ramp rate (ALIGN_RAMP_RATE)

500

V/s

CLosed loop acceleration (CL_ACC)

150

V/s

Open loop duty cycle (OL_DUTY)

25

%

Open loop acceleration (OL_ACC_A1)

100

 Hz/s
Startup brake time (STARTUP_BRK_TIME)

75

 ms
Slow first cycle frequency (SLOW_FIRST_CYC_FREQ)

0.5

Hz
Align time (ALIGN_TIME)

300

ms
Dynamic degauss (DYN_DEGAUSS_EN)

Enabled

-

Table 3-9 shows the default motor startup parameters for very high acceleration.

Table 3-9 Default Motor Startup Parameters for Very High Acceleration

Parameter

Value

Unit

Align ramp rate (ALIGN_RAMP_RATE)

1000

V/s

CLosed loop acceleration (CL_ACC)

250

V/s

Open loop duty cycle (OL_DUTY)

40

%

Open loop acceleration (OL_ACC_A1)

200

 Hz/s
Startup brake time (STARTUP_BRK_TIME)

50

 ms
Slow first cycle frequency (SLOW_FIRST_CYC_FREQ)

1

Hz
Align time (ALIGN_TIME)

100

ms
Dynamic degauss (DYN_DEGAUSS_EN)

Enabled

-

Table 3-10 shows the default motor startup parameters for ultra-high acceleration.

Table 3-10 Default Motor Startup Parameters for Ultra-High Acceleration

Parameter

Value

Unit

Align ramp rate (ALIGN_RAMP_RATE)

1000

V/s

CLosed loop acceleration (CL_ACC)

1000

V/s

Open loop duty cycle (OL_DUTY)

40

%

Open loop acceleration (OL_ACC_A1)

1000

 Hz/s
Startup brake time (STARTUP_BRK_TIME)

10

 ms
Slow first cycle frequency (SLOW_FIRST_CYC_FREQ)

15

Hz
Align time (ALIGN_TIME)

25

ms
Dynamic degauss (DYN_DEGAUSS_EN)

Enabled

-