The ATV9A0C31Q6 is the 315 kW normal-duty (250 kW heavy-duty) member of the Altivar Process ATV900 family, sized for a 600 V supply line. This modular version ships as a kit: control unit, power module, mounting kit, and a fuse set. The drive handles synchronous and asynchronous motors, with a switching frequency adjustable from 2 to 4.9 kHz – expect derating if you push above the default.
The line current at 600 V normal duty hits 316 A; heavy duty pulls 255 A. That's the number your upstream breaker and cable need to handle – not the motor FLA. Prospective line Isc is rated for 50 kA, so if your panel SCCR is below that, you may need a current-limiting fuse upstream. The integrated EMC filter is rated for 300 m of motor cable and meets IEC 61800-3 category C3. That's a second-environment (industrial) filter – it will pass conducted emissions for a typical plant floor but don't count on it for a residential or first-environment install without external filtering. Keep the motor cable shield bonded at both ends; the filter expects a low-impedance ground path. Safe Torque Off (STO) is SIL 3 capable. The drive provides its own 24 V DC supply for the STO and digital inputs (21-27 V). If you're wiring a safety relay or PLC safety output, remember this supply is referenced to the control common – isolate if your safety circuit floats.
Signal integrity and control wiring
The control terminals are removable screw clamps accepting 0.5 to 1.5 mm² (AWG 20 to 16). The digital input supply is 24 V DC with a range of 19 to 30 V – that's wider than many PLC outputs, so a sagging 24 V rail won't drop the drive off. But if the digital inputs share the same supply as a noisy solenoid bank, you'll see phantom triggers; run a separate pair or add a filter. Modbus serial runs over a 2-wire RS-485 at 4.8, 9.6, 19.2, or 38.4 kbit/s, RTU frame, 1-247 addresses. The RJ45 port on slot A can take a Profibus, PROFINET, DeviceNet, EtherCAT, or CANopen card. For Modbus TCP, the native Ethernet port handles 10/100 Mbit/s, half/full duplex, auto-negotiation. If the line is daisy-chained, watch the cable length – the integrated EMC filter is for the motor cable, not the network.
Cabinet mount, IP00 chassis – rated for IP21 or IP54 after cabinet integration. Forced convection cooling; operating altitude 0-2000 m with derating above 1000 m. Environmental: 5-95% RH non-condensing, vibration resistance 0.5 gn at 13-200 Hz. The drive is IEC 61800-5-1 rated for pollution degree 2. That means non-conductive dust is acceptable, but if you're in a conductive dust or washdown area, you'll need an enclosure upgrade.
Sourcing and compliance reality
Supply is quoted to order. For a drive this size, expect a lead time that matches the power module assembly – typically a few weeks from RFQ, not off-the-shelf. No direct drop-in substitute within the same frame; the ATV900 family is segmented by power and cooling, so the 315 kW normal-duty unit is what you specify.