PEC EPE Mechatronics case studies
PEC EPE Mechatronics · Put your knowledge to work in context.
The Engineering Practice Examination (EPE) is the Pakistan Engineering Council's practice-oriented examination, listed on the PEC website under its Continuing Professional Development (CPD) section alongside the EPE Guidebook, a grievance-redressal policy for EPE candidates, and published session results. This page covers the Mechatronics Engineering stream, one of the discipline curricula PEC publishes (the Mechatronics Engineering curriculum appears in the PEC Curricula-2024 set). The PEC EPE Mechatronics case studies are 5 cases and about 4,103 words.
1Vertical Servo Axis Drops on Enable After Gearbox Rebuild
After a gearbox rebuild, a 750 W AC servo on a vertical lift drops 0.6 mm when servo enable is asserted, overshoots the commanded position by 1.2 mm, and rings at about 12 Hz for 300 ms before settling. The axis uses a 17-bit encoder on the motor, a 10:1 planetary gearbox with 8 arcmin backlash, and a 5 mm-lead ball screw.
839 words, about 4 min2Load Cell Zero Drift on a 24/7 Filling Line
On a 24/7 filling line, a 500 kg-rated strain-gauge load cell weighs 25 L drums. The cell is rated 2 mV/V, excited at 10 V, and connected by 30 m of unshielded four-core cable that runs in the same tray as a 7.5 kW pump VFD.
789 words, about 4 min3BLDC Actuator Stutters at Low Duty Cycle
A 48 V battery-powered traction actuator uses a three-phase BLDC motor with 8 pole pairs and a maximum speed of 3000 rpm. The controller uses 20 kHz PWM, 1 µs dead time, and a low-side 1 mΩ shunt with a gain-of-50 current-sense amplifier feeding a 12-bit ADC with a 3.3 V reference.
811 words, about 4 min4Ball Screw Whip on a 300 kg Vertical Lift
A vertical lift raises a 300 kg carriage along a 1.5 m unsupported length of a 25 mm-diameter steel ball screw with a 10 mm lead. The screw is supported at both ends by angular-contact bearings; the nut carries the load in compression.
853 words, about 4 min5SCARA Retasking: Reach, Cycle Time and Warm-Up Offset
A four-axis SCARA robot with shoulder link 350 mm and elbow link 300 mm is being retasked from one product to another. The new pick point is at x = 420 mm, y = 120 mm and the place point is at x = 150 mm, y = −380 mm, both measured from the shoulder axis in the horizontal plane.
811 words, about 4 min