SLLA665 April   2025 MCF8315A , MCF8315C , MCF8315C-Q1 , MCF8315D , MCF8316A , MCF8316C-Q1 , MCF8316D , MCF8329A , MCF8329A-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Open Loop and Handoff Stage
  5. 2EEPROM Configurations Affecting Open Loop to Closed Loop Handoff
  6. 3Open Loop to Closed Loop Handoff Tuning
    1. 3.1 Experimental Way to Tune Open Loop and Handoff Stage
      1. 3.1.1 Step-1: Initial Configuration
      2. 3.1.2 Step-2: Tuning of Parameters In Case Handoff is not Proper
        1. 3.1.2.1 Tuning of OL_ILIMIT
        2. 3.1.2.2 Tuning of Open Loop Acceleration Co-Efficient A1
        3. 3.1.2.3 Tuning of Handoff Thresholds
      3. 3.1.3 Step-3: Tuning of Handoff Configurations
  7. 4Optimum Handoff
    1. 4.1 Open Loop Time With the Recommended Settings
    2. 4.2 Open Loop Time by Following Optimum Handoff Steps
  8. 5Summary
  9. 6References

3.1.2.1 Tuning of OL_ILIMIT

Sometimes setting OL_ILIMIT to (0.5×Rated current)A does not result in a proper handoff because of large inertia of some motors. In these scenarios increase the OL_ILIMIT in steps till the rated peak current of the motor.

MOTOR2: Rated current 0.5A, maximum speed is 250Hz. Figure 3-2 shows handoff is not proper with settings from Section 3.1.1 - A1 = 25Hz/sec, Handoff speed = 20%

Handoff Fails With OL_ILIMIT = 0.25A Figure 3-2 Handoff Fails With OL_ILIMIT = 0.25A
Handoff is Proper With OL_ILIMIT = 0.5A Figure 3-3 Handoff is Proper With OL_ILIMIT = 0.5A