Medium voltage drive with 48-pulse rectifier topology
The ATV1200A11301010 is a Schneider Electric Altivar 1200 medium voltage variable speed drive rated for 945 kW motor power at a supply voltage of 2970...3630 V. The 48-pulse diode rectifier bridge input topology is the defining architecture here — it cancels the 5th, 7th, 11th, and 13th harmonics at the input without a separate active filter, keeping total harmonic distortion (THD) below 5% across the operating range. That means the upstream transformer and switchgear see near-sinusoidal current draw, which matters when the drive shares a feeder with other sensitive loads in a critical facility.
Apparent power and line current for feeder coordination
Apparent power is 1130 kVA with a line current of 65 A at the rated supply voltage. The prospective short-circuit current withstand is 31.5 kA for 150 ms — this sets the minimum SCCR rating for the upstream protective device and buswork. The 28 kV AC dielectric strength between earth and power terminals confirms the insulation coordination for a 3 kV class system; overvoltage category II per EN/IEC 61800-5-1 means the drive is intended for installation downstream of a transformer or distribution board, not at the service entrance.
Overload capability and speed range for process duty
The overload withstand profile gives two operating modes: standard overload at 1.2 In for 60 s or 1.5 In for 3 s, and high overload at 1.5 In for 60 s or 1.85 In for 3 s. The speed range is 20...100%, meaning the drive can regulate down to 20% base speed continuously without a speed feedback device — adequate for centrifugal pump and fan applications where the torque varies with the square of speed. For constant-torque loads like conveyors or extruders running below 20% speed, an encoder feedback option would be required to maintain torque accuracy, though the base unit is configured for sensorless vector control.
Physical footprint and site integration
The drive ships as a floor-standing enclosure measuring 4260 mm wide by 1600 mm deep by 2670 mm high (standard efficiency variant). The enclosure is grey (RAL 7032) with forced convection cooling requiring 23,100 m³/h of cooling air volume. The noise level is 80 dB — a room with multiple drives at this sound pressure will need acoustic treatment if operators occupy the space. Power connection uses M10 screw-type bars accepting up to 6 x 40 mm² cable per phase, entry from top or bottom. The operating position is vertical ±10 degrees.
Control power and I/O complement
Control power requires an external 220 V AC supply rated at 3 kVA; the cooling fan has a separate internal 380 V AC supply. An optional external 220 V AC/DC control supply is available. Galvanic isolation between power and control circuits means the control electronics reference is separate from the DC bus — this prevents ground loops when the drive communicates with a PLC or DCS over a long fieldbus run. The drive includes 4 software-configurable analogue inputs (0...20 mA / 4...20 mA, 250 Ohm impedance), 4 analogue outputs (same range), 6 discrete inputs (expandable to 10), and an integrated EMC filter.
Environmental limits and derating
Operating altitude is 1000...2000 m with a current derating of 0.6% per 100 m above 1000 m. Relative humidity range is 0...90% non-condensing, with an optional 0...95% range. Pollution degree 2 per EN/IEC 61800-5-1 means the drive is rated for a controlled environment where only non-conductive pollution occurs — no condensation or conductive dust. Vibration resistance is 4.9 m/s² from 10 to 50 Hz, adequate for floor-mounted installations in industrial buildings but not for direct machine mounting without vibration isolation.