Technical Specifications

FAQ

1. What is the main function of the Schneider ATS48D22Q soft starter?

The Schneider Electric ATS48D22Q is an Altistart 48 soft starter designed to control the starting and stopping of three-phase asynchronous motors. Instead of allowing the motor to receive the full starting conditions immediately, the soft starter controls the acceleration process so that the motor can build up speed and torque progressively.

The ATS48D22Q is suitable for applications such as pumps, fans, conveyors, compressors and other industrial motor-driven equipment. By controlling the starting process, it can reduce the electrical and mechanical stress associated with direct-on-line starting.

The unit also incorporates motor thermal protection, starter thermal protection and line phase-failure detection. These functions allow the ATS48D22Q to provide both controlled motor starting and important protection functions within an industrial motor control system.

2. What motor power is suitable for the ATS48D22Q?

The applicable motor power depends on the supply voltage, motor connection method and application duty. At 230 V, the in-line configuration is suitable for approximately 4 kW in severe-duty applications and 5.5 kW in standard-duty applications. With an inside-delta connection, the corresponding ratings are approximately 7.5 kW for severe duty and 9 kW for standard duty.

At 400 V, the in-line configuration supports approximately 7.5 kW for severe-duty applications and 11 kW for standard-duty applications. With an inside-delta connection, the applicable ratings are approximately 15 kW for severe duty and 18.5 kW for standard duty.

Actual selection should not be based only on motor power in kW. The motor rated current, starting torque, acceleration time, number of starts and connection method should also be evaluated to ensure the soft starter is correctly matched to the application.

3. What supply voltage does the ATS48D22Q support?

The ATS48D22Q is designed for three-phase AC supply systems from 230 to 415 V. The applicable supply tolerance is approximately -15% to +10%, and the operating frequency is 50–60 Hz.

Before installation, the incoming power supply should be checked against the soft starter and motor nameplate ratings. The three-phase voltage should also be checked for significant imbalance or phase loss, and all power connections should be inspected.

The ATS48D22Q supports both in-line and inside-delta motor connections. These configurations have different current relationships and motor power capabilities, so the wiring and parameter configuration must correspond to the actual installation method.

4. How does the ATS48D22Q provide a controlled motor start?

The ATS48D22Q uses torque-controlled starting to regulate the motor acceleration process. The motor can progressively develop the required starting torque and increase its speed instead of receiving an abrupt full-voltage starting condition.

This approach can reduce electrical disturbances and mechanical shock. For equipment containing couplings, gearboxes, belts, shafts or other transmission components, gradual acceleration can help reduce sudden mechanical loading.

The controlled starting process is particularly useful for pumps, conveyors, fans and compressors. It can make the transition from standstill to normal operation smoother and help reduce unnecessary stress on the driven equipment.

The starting parameters should be adjusted according to the actual load. A starting time that is too short may result in insufficient acceleration control, while an excessively long starting time can increase the thermal load on the motor and soft starter.

5. What protection functions are available on the ATS48D22Q?

The ATS48D22Q provides integrated motor thermal protection, starter thermal protection and line phase-failure detection.

Motor thermal protection monitors the thermal load generated during motor operation and starting. This is particularly important when the motor is overloaded, requires a long acceleration period or is started frequently.

Starter thermal protection is designed to protect the internal power electronic components from excessive thermal stress. Repeated starting or high-load operation can increase the temperature of the power section, making thermal protection an important part of reliable operation.

Line phase-failure detection helps identify abnormal three-phase supply conditions. A missing phase can cause current imbalance, reduced motor torque and excessive heating, so the incoming power supply and motor wiring should be checked if a phase-related fault occurs.

6. Can the ATS48D22Q communicate with a PLC through Modbus?

Yes. The ATS48D22Q supports Modbus communication through an RS485 multidrop interface. It can therefore be connected to PLCs, industrial controllers and other automation systems for status and diagnostic data exchange.

The communication interface uses an RJ45 connector and supports communication speeds of 4800, 9600 and 19200 bps. When integrated into an automation system, the soft starter can provide operating and diagnostic information to the control system.

During commissioning, the Modbus address, baud rate and other communication parameters must be configured consistently between the ATS48D22Q and the PLC or Modbus master.

If communication cannot be established, the troubleshooting process should begin with the communication settings, RS485 wiring, connector and PLC program. A communication failure does not necessarily indicate a fault in the soft starter’s power section.

7. What should be checked if the ATS48D22Q trips during motor starting?

When the ATS48D22Q trips during startup, the first step is to identify the specific fault or diagnostic condition. The cause may be related to the power supply, motor parameters, starting settings, mechanical load or thermal conditions.

The motor rated current should first be compared with the ATS48D22Q application requirements. The starting time and torque settings should then be reviewed. If the connected load requires excessive torque, the motor may accelerate too slowly, increasing current and thermal stress.

The three-phase supply should also be checked for phase loss, abnormal voltage or significant imbalance. The motor wiring must be verified as well, especially when using an in-line or inside-delta connection.

Mechanical problems can also cause startup faults. A blocked pump, overloaded conveyor, excessive compressor pressure or seized bearing may prevent the motor from reaching normal speed.

For applications with frequent starts, the starting interval should also be checked. Repeated starts can cause heat to accumulate in both the motor and soft starter, eventually causing thermal protection to operate.

8. What should be considered when selecting and commissioning the ATS48D22Q?

Selection of the ATS48D22Q should begin with the motor rated current and supply voltage, followed by evaluation of the actual application conditions. Motor power, connection method, starting torque, acceleration time, starting frequency and duty level should all be considered.

The distinction between standard-duty and severe-duty applications is particularly important. For example, at 400 V, an in-line connection is applicable to approximately 11 kW in standard duty, while an inside-delta connection can support approximately 18.5 kW in standard duty. Severe-duty ratings are lower.

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

The selected motor connection must also be verified because in-line and inside-delta configurations have different electrical characteristics. Power wiring and control wiring should be inspected before energizing the system.

If the ATS48D22Q is connected to a PLC or automation system, digital inputs, outputs and Modbus communication should also be tested. After the first startup, monitoring motor current, acceleration behavior, operating status and fault records can help confirm that the configuration is suitable for the actual machine.