Technical Specifications

FAQ

1. What is the Schneider ATV71HC31N4 used for?
The ATV71HC31N4 is a 315 kW / 500 HP high-power variable-speed drive designed for demanding industrial applications. Typical applications include large pumps, fans, compressors, conveyors, hoisting equipment, and other machinery requiring controlled motor speed and high torque performance.

2. What power supply does the ATV71HC31N4 require?
The drive is designed for a 380–480 VAC, three-phase power supply. The specified supply tolerance is -15% to +10%. The upstream transformer, protection devices, cables, and short-circuit capacity should be selected according to the actual installation conditions.

3. What is the rated output current of the ATV71HC31N4?
The rated output current is 616 A at a nominal switching frequency of 2.5 kHz. When operating at higher switching frequencies or under demanding ambient conditions, the allowable current may need to be reduced according to the applicable derating requirements.

4. Which motor control methods are supported?
The ATV71HC31N4 supports V/F control, Sensorless Flux Vector Control (SFVC), Flux Vector Control with Sensor (FVC), and ENA Energy Adaptation. FVC with an encoder can be used when the application requires higher speed accuracy, low-speed torque, or improved dynamic response.

5. How long can the motor cable be with the ATV71HC31N4?
The recommended maximum cable length is approximately 100 m for shielded motor cable and 200 m for unshielded cable. Long motor cables can increase leakage current, EMC interference, and voltage stress on the motor insulation, so proper grounding and cable selection are important.

6. What should be checked if the ATV71HC31N4 reports an overcurrent fault?
Check for motor shaft locking, excessive mechanical load, sudden load changes, and short circuits between the U/V/W output phases. The motor nameplate data and drive parameters should also be verified. If the fault occurs during acceleration, check the acceleration time, load inertia, current limit, and motor control configuration.

7. What transient current capability does the ATV71HC31N4 have?
The drive can provide up to 1,016 A for 2 seconds and 924 A for 60 seconds under the specified operating conditions. The actual overload capability depends on factors such as switching frequency, ambient temperature, operating cycle, and the thermal condition of the drive.

8. Can the ATV71HC31N4 be used with high-inertia loads requiring rapid deceleration?
Yes. For high-inertia loads, the energy regenerated by the motor during deceleration can raise the DC bus voltage. Applications requiring rapid or frequent deceleration may therefore require an appropriately sized braking system and external braking resistor. The braking components should be selected based on motor power, load inertia, deceleration time, and duty cycle.