786 kW medium-voltage drive with 24-pulse input
The ATV1200A9404242 is a Schneider Electric Altivar 1200 series medium-voltage AC drive rated for 786 kW motor power at a supply voltage range of 2970 to 3630 V. Its 24-pulse diode rectifier bridge input reduces line-side harmonics below IEEE 519 thresholds without an external filter — a key advantage for installations with weak grid connections or strict power-quality requirements. The drive delivers 940 kVA apparent power and draws 150 A line current at full load. Overload capability is configurable: 1.2× rated current for 60 seconds (standard duty) or 1.5× for 60 seconds (high overload), with a short-term peak of 1.85× for 3 seconds — enough to handle crusher or centrifuge starting torque without oversizing the drive.
Physical footprint and cooling demands
The drive ships in a floor-standing enclosure with separate air flows for power and control sections. Standard-efficiency models measure 3060 mm wide × 1400 mm deep × 2520 mm high; high-efficiency variants are wider (3660 mm) and taller (2670 mm). The enclosure colour is grey RAL 7032. Forced convection cooling moves 13,200 m³/h (standard) or 19,800 m³/h (high efficiency) of air. The cooling fan requires its own 380 V AC supply — either internal or optional external. Noise level at full fan speed is 80 dB, so ear protection is advisable during commissioning in an enclosed room.
Compliance and isolation architecture
The ATV1200A9404242 carries CE marking and complies with EN/IEC 61800-3 (EMC), EN/IEC 61800-4 (harmonic), and EN/IEC 61800-5-1 (safety). Dielectric strength between earth and power terminals is 20 kV AC. Pollution degree 2 per EN/IEC 61800-5-1, overvoltage category II — suitable for clean indoor industrial environments. Electrical isolation between power and control circuits means the 24 V DC control supply (220 V AC, 3 kVA external) can be referenced to a separate ground from the medium-voltage power section — a practical advantage when integrating with PLCs on a different earthing system.
I/O complement and connection
The drive includes 4 software-configurable analogue inputs (0–20 mA / 4–20 mA, 250 Ω impedance) and 2 analogue outputs of the same type. Digital inputs: 6 standard, expandable to 10 with an optional card. The line-side power connection uses M10 bar-type screw terminals accepting up to 6 × 40 mm² cable per phase, entry from bottom or top. Prospective line short-circuit current withstand is 31.5 kA for 150 ms — coordinate the upstream breaker to clear within this window to avoid drive damage. Ground fault protection is built into the drive itself, not reliant on external relays.
Environmental limits and derating
Operating altitude from 1000 m to 2000 m requires current derating of 0.6 % per 100 m above 1000 m. Relative humidity range is 0–90 % (0–95 % optional). Operating position is vertical ±10 degrees. Vibration resistance is 4.9 m/s² at 10–50 Hz — adequate for standard floor-mounted installations but not for direct mounting on vibrating machinery. The drive is designed for both synchronous and asynchronous motors, with a speed range of 20–100 % of base speed. Output voltage is limited to ≤ supply voltage — typical for a VSI topology.