Medium-voltage drive for 518 kW motors
The ATV1200A6205555 is a Schneider Electric Altivar 1200 medium-voltage AC drive rated for 518 kW motor power at a supply voltage of 2970...3630 V. This is not a standard 480 V drive — the input voltage range places it in the medium-voltage class, typically fed from a 3.3 kV or 3.6 kV distribution system via a dedicated transformer or direct connection. The drive's apparent power rating of 620 kVA sets the transformer sizing floor and the cable ampacity requirement for the input feeder. The 30-pulse diode rectifier front end provides harmonic mitigation equivalent to a 12-pulse or 18-pulse design without an external filter — a key advantage for IEEE 519 compliance at the point of common coupling.
Overload duty and physical footprint
The overload withstand profile gives two duty bands: standard overload handles 1.2× In for 60 s and 1.5× In for 3 s; high overload handles 1.5× In for 60 s and 1.85× In for 3 s. For a 518 kW motor driving a high-inertia load like a centrifuge or crusher, the high-overload curve may be the deciding factor — if the starting or peak torque demand exceeds 1.5× rated current for more than a few seconds, the standard overload rating will trip the drive. The drive ships in a floor-standing enclosure with separate air flows for the power cells and control section. Dimensions are 2860 mm wide by 1400 mm deep by 2590 mm high for the standard-efficiency variant, and 3160 mm wide by 1500 mm deep by 2740 mm high for the high-efficiency variant. The cooling air volume is 16600 m³/h (standard) or 19900 m³/h (high efficiency) — the room's HVAC system must handle this heat rejection, not just the drive's own forced-convection fans. The prospective line short-circuit current rating is 31.5 kA for 150 ms — the upstream breaker or fuse must coordinate to clear within this window to avoid damaging the drive's input rectifier. Dielectric strength between earth and power terminals is 20 kV AC, consistent with the medium-voltage insulation class.
Composition and control interface
The drive comprises 15 power cells, a phase-shifting transformer, medium-voltage arrestors, cooling fans, and a human-machine interface mounted in the enclosure. The 30-pulse rectifier is implemented via the phase-shifting transformer feeding the cells — this topology cancels harmonics up to the 29th order without an external filter bank. Control wiring connects to 4 software-configurable analogue inputs (0-20 mA / 4-20 mA, 24 V max, 250 Ohm impedance) and 2 analogue outputs (same current range). Discrete inputs number 6 standard, expandable to 10 with an optional module. Electrical isolation between power and control circuits is standard, and the control supply requires an external 220 V AC source at 3 kVA. The drive is CE marked and complies with EN/IEC 60204-11, EN/IEC 60529, EN/IEC 61800-3 (EMC), EN/IEC 61800-4, and EN/IEC 61800-5-1 (safety). Pollution degree 2 per the safety standard, overvoltage category II. Operating altitude derating begins at 1000 m — 0.6 % per 100 m above that — so at 2000 m the drive must be derated to about 94 % of its rated output.