Technical Specifications

FAQ

1. What is the main function of the Schneider ATV950D11N4?
The ATV950D11N4 is an Altivar Process ATV950 variable-speed drive designed for industrial process applications. It regulates the speed and torque of three-phase motors by controlling the output voltage and frequency. The drive can be used with pumps, fans, compressors, conveyors and other industrial machinery where stable motor control and process integration are required. Its industrial communication functions also allow it to exchange operating data and control commands with PLC, SCADA and other automation systems.

2. What motor power is supported by the ATV950D11N4?
The ATV950D11N4 is rated for motors up to 11 kW / 15 HP under Normal Duty conditions and approximately 7.5 kW / 10 HP under Heavy Duty conditions. The correct rating depends on the actual load profile rather than motor power alone. Motor rated current, voltage, starting torque, acceleration requirements and overload characteristics should all be checked before selecting the operating duty. Applications with frequent overload or high starting torque should be evaluated using the Heavy Duty rating.

3. What are the input and output current ratings of the ATV950D11N4?
For Normal Duty operation, the input line current is approximately 19.8 A at 380 V and 17.0 A at 480 V, while the rated output current is approximately 23.5 A at 4 kHz. For Heavy Duty operation, the input current is approximately 14.1 A at 380 V and 12.5 A at 480 V, with a rated output current of approximately 16.5 A. The drive also provides short-term overload capability, with transient current ratings of approximately 28.2 A for 60 seconds in Normal Duty and 24.8 A for 60 seconds in Heavy Duty.

4. Which motor control modes are available on the ATV950D11N4?
The ATV950D11N4 supports several motor control modes for different load characteristics, including constant-torque, variable-torque and optimized torque control. It can also be configured for permanent-magnet and synchronous-reluctance motors. Variable-torque control is commonly used for centrifugal pumps and fans, while constant-torque applications may include conveyors and machinery requiring relatively high torque throughout the operating range. Accurate motor nameplate data should be entered during commissioning to achieve stable control.

5. What should be checked when the ATV950D11N4 trips on overcurrent during acceleration?
Begin by checking the mechanical load for excessive friction, blockage, seized bearings or abnormal resistance. A machine with high inertia can also produce substantial motor current if the acceleration time is too short. Next, verify the programmed motor voltage, current, frequency and power against the actual motor nameplate. Inspect the motor cable and terminals for phase-to-phase faults, grounding problems or incorrect connections. If the mechanical and electrical systems are normal, increasing the acceleration time can be used as a troubleshooting step to determine whether the fault is related to the acceleration profile.

6. How can the ATV950D11N4 be connected to a PLC?
The ATV950D11N4 supports Modbus TCP, EtherNet/IP and Modbus Serial communication, allowing it to exchange control and monitoring data with industrial controllers. During integration, configure the communication protocol, network address, communication parameters, command source and speed-reference source. The PLC can then send start/stop and speed commands while reading parameters such as actual frequency, motor current, drive status and fault information. If communication is established but the drive does not respond to commands, the selected command channel should be checked carefully.

7. What can cause thermal or overload faults on the ATV950D11N4?
Thermal and overload faults can result from sustained high motor current, excessive mechanical load, frequent acceleration and deceleration, insufficient cooling or unsuitable operating conditions. Check whether the motor is continuously operating near the drive’s rated current and inspect the cooling fan and airflow path. A high switching frequency can also increase internal power losses. Ambient temperature and installation conditions should be considered as well. If the fault occurs repeatedly under normal mechanical loading, review the motor parameters and confirm that the selected Normal Duty or Heavy Duty configuration matches the actual application.

8. How should Modbus TCP or EtherNet/IP communication faults be diagnosed?
Start with the physical network by checking Ethernet cables, connectors, switches and communication indicators. Then verify the IP address, network configuration and communication settings between the PLC and drive. If the network connection is active but commands are not executed, check whether the drive’s command source and frequency reference are assigned to the communication channel rather than local terminals or another control source. Intermittent communication problems should also prompt an inspection of cable routing, shielding and grounding, particularly where motor power cables and high-current switching equipment are installed nearby. The drive diagnostic information and PLC communication status can then be compared to identify configuration or network-related faults.