Technical Specifications

FAQ

1. What is the main function of the Schneider ATV650D55N4?
The ATV650D55N4 is a 55 kW variable-speed drive from the Altivar Process ATV650 series. It is designed to control the speed, torque and acceleration of three-phase motors in industrial and process applications. Typical applications include pumps, fans, compressors, HVAC systems, water-treatment equipment and other continuous-duty process machinery. The drive regulates motor voltage and frequency according to the required operating point.

2. What motor power is supported by the ATV650D55N4?
The ATV650D55N4 is rated for a 55 kW motor, approximately 75 HP, under Normal Duty conditions. For Heavy Duty operation, the applicable motor rating is approximately 45 kW or 60 HP. Selection should be based not only on motor power but also on motor current, starting torque, overload requirements, acceleration profile and the actual mechanical load.

3. What input voltage and frequency does the ATV650D55N4 require?
The ATV650D55N4 is designed for a three-phase 380–480 VAC power supply with an input frequency of 50–60 Hz. The incoming supply should be suitable for the drive’s rated electrical characteristics. Proper upstream protection, grounding and cable sizing are required, particularly for high-power installations.

4. What is the maximum output frequency of the ATV650D55N4?
The ATV650D55N4 can provide an output frequency of up to approximately 500 Hz. The actual operating frequency should be configured according to the motor’s rated characteristics and the mechanical limitations of the driven equipment. When operating above the motor’s nominal frequency, the motor’s maximum speed, cooling performance, bearings and mechanical transmission must be checked carefully.

5. What types of motors can the ATV650D55N4 control?
The ATV650D55N4 supports asynchronous motors and synchronous motors, with suitable configurations also available for reluctance motor applications. During commissioning, the correct motor control mode should be selected and the motor nameplate information should be entered accurately. Correct settings for rated voltage, current, frequency and speed are important for stable operation and effective motor protection.

6. Which communication interfaces are available on the ATV650D55N4?
The ATV650D55N4 supports Modbus TCP and Modbus Serial RS-485 communication. These interfaces allow the drive to exchange operating data, control commands, alarms and diagnostic information with PLC, DCS, SCADA and other automation systems. Communication parameters such as the device address, baud rate, protocol settings and control configuration must be matched with the connected control system.

7. What should be checked if the ATV650D55N4 reports an overcurrent or overload fault?
First check the motor parameters stored in the drive and compare them with the actual motor nameplate. Then inspect the motor cables, terminal connections, insulation condition and mechanical load. If overcurrent occurs during acceleration, check whether the acceleration time is too short or whether the driven machine has excessive starting resistance. If an overload occurs during continuous operation, check the actual load, motor current, ventilation and whether the drive is correctly selected for Normal Duty or Heavy Duty operation.

8. What safety function does the ATV650D55N4 provide?
The ATV650D55N4 provides STO (Safe Torque Off), which prevents the drive from producing motor torque when the safety circuit is activated. STO can be integrated into machine safety systems for applications such as emergency stopping, safety-door interlocking and equipment protection. STO does not replace complete electrical isolation, so maintenance work still requires the appropriate power isolation, lockout/tagout and voltage verification procedures.