Vendor-agnostic large VFDs: parameters, harmonics, dV/dt, common-mode currents, ride-through, and reliability. Four levels from field tech to drives & reliability lead.
Question bank
100 total questions
Each quiz session serves a randomized subset from the bank, so retakes stay fresh.
20 Questions · Nameplates, alarms, safe approach
Reading nameplate and alarm displays, basic recovery procedures, IGBT and DC bus concepts at a high level, safe approach and capacitor discharge.
20 Questions · Parameters & control wiring
Parameter sets, autotune, accel/decel, control wiring (24V, STO), motor data entry, and basic skip-frequency setup.
20 Questions · Harmonics, dV/dt, bearing currents
5th/7th/11th harmonics, THDi vs THDv, line reactors vs AHF vs 18-pulse, dV/dt and motor cable length, common-mode and bearing currents.
20 Questions · Ride-through, regen, MCSA
Ride-through strategy, regen vs braking resistor, redundancy, predictive maintenance, vibration and motor-current signature analysis (MCSA).