Technical Specifications

FAQ

1. What is the main difference between the ATV650U55N4E and ATV650U55N4?
The ATV650U55N4E provides the same basic 5.5 kW drive rating as the standard ATV650U55N4, but the E version includes an integrated Vario disconnect switch. This provides a convenient means of isolating the drive during maintenance and servicing. The integrated disconnect is particularly useful where local isolation is required near the drive.

2. What motor power can the ATV650U55N4E control?
The ATV650U55N4E is rated for motors up to 5.5 kW (7.5 HP) under normal-duty conditions. For heavy-duty applications, the corresponding motor rating is 4 kW (5 HP). Motor selection should be based on rated motor current and actual load characteristics rather than motor power alone, especially for applications involving frequent acceleration, high starting torque or significant overload conditions.

3. What are the input and output current ratings of the ATV650U55N4E?
For normal-duty operation, the input current is approximately 10.4 A at 380 V and 9.1 A at 480 V, while the continuous output current is 12.7 A at a 4 kHz switching frequency. Under heavy-duty operation, the input current is approximately 8 A at 380 V and 7.2 A at 480 V, with a continuous output current of 9.3 A. Upstream protection and cable sizing should be determined according to the installation requirements and actual operating conditions.

4. Which motor types are supported by the ATV650U55N4E?
The drive supports both asynchronous and synchronous motors. It can be used for variable-torque and constant-torque applications and can also support applications involving permanent-magnet synchronous motors and synchronous reluctance motors when properly configured. During commissioning, the motor nameplate data should be entered accurately to achieve stable motor control and appropriate protection.

5. What is the output frequency range of the ATV650U55N4E?
The output frequency range is 0.1 to 500 Hz. The nominal switching frequency is 4 kHz, while the switching frequency can be adjusted within a wider range depending on the application. The maximum operating frequency of the motor should always be checked against the motor manufacturer’s speed limits, mechanical system limitations, bearing requirements and load characteristics.

6. How should an overcurrent or overload fault be diagnosed on the ATV650U55N4E?
Start by checking whether the motor parameters have been entered correctly, including rated voltage, current, frequency and speed. Then inspect the motor cable for short circuits, grounding problems or incorrect connections. Mechanical problems such as a locked shaft, excessive friction or an overloaded machine should also be checked. If the fault occurs mainly during acceleration, review the acceleration time and load inertia. If overcurrent occurs during steady-state operation, investigate the actual mechanical load and motor operating condition.

7. Can the ATV650U55N4E communicate with PLC, DCS and SCADA systems?
Yes. The drive provides Ethernet and RS-485 communication capabilities for integration into industrial automation systems. Depending on the communication configuration, a PLC, DCS or SCADA system can monitor operating status, frequency, current and fault information and can also perform functions such as start/stop control and speed reference management. This makes the ATV650U55N4E suitable for centralized drive monitoring and process control.

8. How do the monitoring and Stop and Go functions improve system efficiency?
The ATV650U55N4E includes power measurement, energy monitoring, process monitoring and Stop and Go functionality. In applications such as pumps and fans, the drive can adjust motor operation according to actual process demand instead of continuously operating at full speed. Monitoring power consumption and process conditions can also help identify abnormal loading, declining equipment performance or changes in operating conditions, supporting energy optimization and preventive maintenance.