Technical Specifications

FAQ

1. What is the main function of the Schneider ATV930C25N4 Variable-Speed Drive?
The ATV930C25N4 is a high-power Altivar Process ATV930 variable-speed drive designed for demanding industrial process applications. It controls the speed and torque of three-phase motors by regulating the output voltage and frequency. With a 250 kW normal-duty rating and a 200 kW heavy-duty rating, it can be used in large-scale machinery where stable motor control, process monitoring, communication, and continuous operation are important. Typical applications include pumps, fans, compressors, conveyors, material-handling equipment, and process machinery.

2. What motor power can the ATV930C25N4 support?
The drive is rated for motors up to 250 kW / 400 HP under Normal Duty conditions. For applications requiring significant overload capability, the Heavy Duty rating is 200 kW / 300 HP. Motor selection should not be based on power alone. The motor rated current, voltage, frequency, load profile, starting requirements, overload conditions, and required acceleration characteristics should also be checked. For heavy industrial loads, the Heavy Duty rating should be considered when selecting the drive.

3. What are the input and output current ratings of the ATV930C25N4?
Under Normal Duty operation, the line current is approximately 451 A at 380 V and 366 A at 480 V, with a maximum continuous output current of approximately 481 A. Under Heavy Duty operation, the line current is approximately 365 A at 380 V and 301 A at 480 V, with a maximum continuous output current of approximately 387 A. The drive can provide short-term overload capability, with transient current ratings of approximately 577 A for 60 seconds in Normal Duty and 581 A for 60 seconds in Heavy Duty. Actual operating limits depend on switching frequency, ambient conditions, load profile, and installation conditions.

4. What types of motors can the ATV930C25N4 control?
The ATV930C25N4 supports both three-phase asynchronous motors and synchronous motors. Its control functions include variable-torque and constant-torque control for asynchronous motors, as well as control profiles for permanent-magnet and synchronous-reluctance motors. This flexibility allows the drive to be configured for different industrial machines and process requirements. During commissioning, the motor nameplate information should be entered accurately and the appropriate motor-control profile selected to ensure correct current regulation, torque production, and speed control.

5. What should be checked if the ATV930C25N4 trips on overcurrent during acceleration?
First inspect the mechanical system for excessive load, blockage, seized bearings, abnormal friction, or high starting torque. A large inertial load combined with a short acceleration time can cause a substantial increase in motor current. The motor parameters programmed into the drive should then be compared with the actual nameplate values, particularly rated voltage, current, power, and frequency. The motor cables should also be inspected for phase-to-phase shorts, ground faults, insulation damage, and incorrect connections. If the mechanical and electrical systems are normal, increasing the acceleration time can help determine whether the fault is associated with the acceleration profile.

6. How should the ATV930C25N4 be integrated into a PLC or industrial automation network?
The ATV930C25N4 supports Modbus serial, Modbus TCP, and EtherNet/IP communication, with additional communication options available through expansion modules. When integrating the drive with a PLC, first select the required communication protocol and install the appropriate communication interface if necessary. Configure the drive address, baud rate or Ethernet parameters, command source, speed-reference source, and communication mapping according to the PLC program. After configuration, verify that start/stop commands, frequency references, actual speed, current, status words, and fault information are exchanged correctly before placing the machine into normal production.

7. What should be checked if the ATV930C25N4 frequently reports thermal or overload faults?
Check the motor load and determine whether the drive is continuously operating close to its maximum current. Mechanical overload, excessive acceleration frequency, blocked machinery, or abnormal process conditions can cause sustained high current and thermal stress. The cabinet cooling system and forced-air airflow should also be inspected. Switching frequency is another important factor because higher switching frequencies can increase losses and may require current derating. If the drive is installed at an elevated altitude or in a high-temperature environment, the applicable derating requirements should also be considered. The Normal Duty or Heavy Duty selection should match the actual machine load profile.

8. How can communication or control problems on the ATV930C25N4 be diagnosed?
Start by checking the physical communication network, including cables, connectors, shielding, grounding, Ethernet connections, and network configuration. Verify the drive’s communication address and protocol parameters and make sure they correspond with the PLC or supervisory controller. If communication works intermittently, inspect the installation for electromagnetic interference from motor cables, contactors, transformers, and other high-power equipment. The drive’s diagnostic information should also be checked for communication errors, command-source conflicts, or network timeout conditions. For complex process systems, reviewing the PLC communication status together with the drive status and fault history can help identify whether the problem originates from the network, configuration, or drive control logic.