Electric Lift Truck Systems and AC Traction Drives

This course provides foundational technical competencies required to service electric industrial lift trucks, focusing on chassis electrical architecture and three-phase alternating current (AC) traction drive systems. Technicians examine the interplay between main power disconnects, pre-charge circuits, DC link bus capacitors, and variable frequency motor controllers utilizing insulated-gate bipolar transistors (IGBTs). Core principles cover vector drive theory, pulse-width modulation (PWM), and rotor position sensor feedback incorporating quadrature encoders and resolvers. Students explore regenerative braking physics, thermal management of power electronics, dynamic steering control interfaces, and Controller Area Network (CAN bus) signal integrity. Safety protocols, zero-energy state verification, and standardized electrical isolation techniques are integrated into every diagnostic sequence. Through rigorous laboratory exercises and systematic fault isolation procedures, participants learn to diagnose drive-line anomalies, evaluate traction motor performance, and interpret live controller data parameters to optimize material handling fleet reliability and operational safety.

InstructorJacob Calhoun

Course outline

Lectures, virtual labs, and graded assignments — completed in your browser.

01Lesson 1: High-Voltage Safety, Lockout/Tagout, and Chassis Electrical Architecturelecture

02Lesson 2: DC Bus Distribution, Pre-Charge Circuits, and Contactor Operationlecture

03Lesson 3: Three-Phase Induction and Permanent Magnet AC Traction Motorslecture

04Hands-on Lab: DC Bus Isolation, Pre-Charge Testing, and Contactor Servicelab

05Lesson 5: Inverter Electronics: Gate Drivers and IGBT Switching Fundamentalslecture

06Lesson 6: Pulse-Width Modulation (PWM) and Inverter Frequency Controllecture

07Lesson 7: Rotor Feedback Transducers: Encoders, Resolvers, and Speed Sensinglecture

08Hands-on Lab: Inverter Waveform Analysis and Motor Encoder Calibrationlab

09Lesson 9: Closed-Loop Vector Control and Dynamic Torque Managementlecture

10Lesson 10: Regenerative Braking Operation and Directional Reversal Dynamicslecture

11Hands-on Lab: Dynamic Regenerative Braking and Thermal Overload Diagnosticslab

12Lesson 12: Traction Controller Area Network (CAN Bus) Communications and Telemetrylecture

13Lesson 13: Drive-Line Fault Codes, Parameter Tuning, and Diagnostic Treeslecture

14Capstone Service Project: Full-Vehicle AC Traction Drive Diagnostic and Service Projectassignment

Syllabus

["Week 1: Lesson 1: High-Voltage Safety, Lockout/Tagout, and Chassis Electrical Architecture", "Week 2: Lesson 2: DC Bus Distribution, Pre-Charge Circuits, and Contactor Operation", "Week 3: Lesson 3: Three-Phase Induction and Permanent Magnet AC Traction Motors", "Week 4: Hands-on Lab: DC Bus Isolation, Pre-Charge Testing, and Contactor Service", "Week 5: Lesson 5: Inverter Electronics: Gate Drivers and IGBT Switching Fundamentals", "Week 6: Lesson 6: Pulse-Width Modulation (PWM) and Inverter Frequency Control", "Week 7: Lesson 7: Rotor Feedback Transducers: Encoders, Resolvers, and Speed Sensing", "Week 8: Hands-on Lab: Inverter Waveform Analysis and Motor Encoder Calibration", "Week 9: Lesson 9: Closed-Loop Vector Control and Dynamic Torque Management", "Week 10: Lesson 10: Regenerative Braking Operation and Directional Reversal Dynamics", "Week 11: Hands-on Lab: Dynamic Regenerative Braking and Thermal Overload Diagnostics", "Week 12: Lesson 12: Traction Controller Area Network (CAN Bus) Communications and Telemetry", "Week 13: Lesson 13: Drive-Line Fault Codes, Parameter Tuning, and Diagnostic Trees", "Week 14: Capstone Service Project: Full-Vehicle AC Traction Drive Diagnostic and Service Project"]