Technical Specifications

FAQ

1. What is the main function of the Schneider ATS48D47Q soft starter?

The Schneider Electric ATS48D47Q is an Altistart 48 soft starter designed to control the starting and stopping of three-phase asynchronous motors. It uses torque-controlled starting to gradually accelerate the motor instead of applying the full starting condition abruptly.

This controlled starting method helps reduce mechanical shock and electrical stress during motor acceleration. It is particularly suitable for pumps, fans, conveyors, compressors and other industrial machines where a smooth start is important.

The ATS48D47Q also provides motor thermal protection, starter thermal protection and line phase-failure detection. These functions allow the unit to provide both controlled motor starting and protection within an industrial motor control system.

2. What motor power is suitable for the ATS48D47Q?

The applicable motor power depends on the supply voltage, connection method and duty level. For an in-line connection, the ATS48D47Q supports approximately 9 kW for severe-duty applications and 11 kW for standard-duty applications at 230 V. At 400 V, the corresponding ratings are approximately 18.5 kW for severe duty and 22 kW for standard duty.

With an inside-delta connection, the applicable motor power is higher. At 230 V, the ratings are approximately 18.5 kW for severe duty and 22 kW for standard duty. At 400 V, the ATS48D47Q can be applied to approximately 30 kW severe-duty and 45 kW standard-duty motors.

Motor rated current should be treated as the primary selection parameter. Motor power, starting torque, acceleration time, load characteristics and starting frequency should also be considered when determining whether the ATS48D47Q is suitable for a particular application.

3. What supply voltage does the ATS48D47Q support?

The ATS48D47Q is designed for three-phase AC systems from 230 to 415 V. Its specified supply voltage range is approximately 195–456 V AC, with an operating frequency of 50–60 Hz.

Before commissioning, the incoming supply should be checked against the motor and soft starter requirements. The three phases should also be inspected for phase loss, excessive voltage imbalance or other abnormal conditions.

The ATS48D47Q supports both in-line and inside-delta motor connections. These two connection methods have different current and motor power ratings, so the actual power wiring must match the selected configuration.

4. How does the ATS48D47Q reduce motor starting stress?

The ATS48D47Q uses torque-controlled starting to regulate motor acceleration. Instead of allowing the motor to produce a sudden starting torque, the soft starter progressively controls the acceleration process until the motor reaches its normal operating speed.

This can reduce mechanical stress on couplings, gearboxes, belts, shafts and other transmission components. It can also reduce the electrical disturbance associated with high-current direct-on-line starting.

The controlled starting function is especially useful for pumps, conveyors, fans and compressors. For pumping systems, controlled acceleration and stopping can also help reduce sudden hydraulic changes.

The starting parameters should be adjusted according to the actual mechanical load. If the acceleration time is too short, the motor may not develop sufficient torque; if it is too long, thermal stress on the motor and soft starter may increase.

5. What protection functions are available on the ATS48D47Q?

The ATS48D47Q provides integrated motor thermal protection, starter thermal protection and line phase-failure detection.

Motor thermal protection monitors the thermal load associated with motor operation and starting. Long acceleration periods, excessive load or frequent starts can increase motor temperature, so correct thermal settings are important for reliable operation.

Starter thermal protection protects the internal power components from excessive heat. This is particularly important in applications involving heavy loads, long starting periods or frequent motor starts.

Line phase-failure detection identifies abnormal three-phase supply conditions. A missing phase can cause current imbalance, reduced motor torque and excessive heating. When such a fault occurs, the incoming power supply and motor connections should be inspected before restarting the equipment.

6. Can the ATS48D47Q communicate with a PLC through Modbus?

Yes. The ATS48D47Q supports Modbus communication through an RS485 multidrop interface. It can therefore be integrated into PLC-based motor control systems, industrial automation networks and centralized monitoring systems.

The communication interface uses an RJ45 connector and supports transmission rates of 4800, 9600 and 19200 bps. Available operating and diagnostic information can be exchanged between the soft starter and the automation controller.

During commissioning, the Modbus address, baud rate and other communication settings should be configured consistently between the ATS48D47Q and the PLC or Modbus master.

If communication is unsuccessful, technicians should check the RS485 wiring, RJ45 connection, communication parameters and PLC configuration first. A communication fault does not necessarily indicate a failure of the soft starter’s power section.

7. Why might the ATS48D47Q trip when starting a motor?

A startup trip can be caused by incorrect configuration, excessive mechanical load, abnormal power supply conditions, incorrect motor wiring or excessive thermal stress.

The first step is to identify the actual fault or diagnostic condition. The motor rated current should then be compared with the ATS48D47Q rating, followed by a review of the starting torque and acceleration settings.

The incoming three-phase supply should be checked for phase loss, abnormal voltage and significant imbalance. The motor terminals should also be inspected to confirm that the selected in-line or inside-delta connection has been wired correctly.

Mechanical problems should also be considered. A blocked pump, overloaded conveyor, excessive compressor pressure, seized bearing or other mechanical restriction can prevent the motor from reaching normal operating speed.

For applications with frequent starts, the time between starts should also be checked. Repeated starting without adequate cooling can result in thermal accumulation and activation of the starter or motor thermal protection.

8. What should be considered when selecting and commissioning the ATS48D47Q?

Selection should begin with the motor rated current and supply voltage, followed by an assessment of the actual application duty. Motor power, starting torque, acceleration time, connection method and starting frequency should all be considered.

The connection method is particularly important. At 400 V, an in-line connection supports approximately 18.5 kW in severe-duty applications and 22 kW in standard-duty applications. With an inside-delta connection, the corresponding ratings increase to approximately 30 kW for severe duty and 45 kW for standard duty.

During commissioning, the motor parameters should be configured correctly and the starting torque, acceleration time and protection settings should be adjusted according to the actual load.

The power circuit and control wiring should be checked before energizing the equipment. If PLC control or Modbus communication is used, the digital inputs, outputs and communication link should also be tested.

The ATS48D47Q has been discontinued, and a newer ATS480D47Y is available as a replacement option. For replacement applications, the motor ratings, control requirements, communication configuration and installation conditions should be checked carefully before changing models.