Technical Specifications

FAQ

1. What is the main function of the Schneider ATS48D17Q soft starter?

The Schneider Electric ATS48D17Q is an Altistart 48 soft starter designed to control the starting and stopping of three-phase asynchronous motors. Instead of applying full line voltage to the motor immediately, it controls the motor acceleration process to provide a smoother transition from standstill to normal operating speed.

The ATS48D17Q uses torque-controlled starting, which helps reduce the mechanical shock normally associated with direct-on-line motor starting. This makes it suitable for applications such as pumps, conveyors, fans, compressors and other industrial machinery where controlled acceleration is important.

The unit also incorporates motor thermal protection, starter thermal protection and line phase-failure detection. These functions allow the ATS48D17Q to perform both motor starting control and basic protection functions within an industrial motor control system.

2. What motor power is suitable for the ATS48D17Q?

The applicable motor power depends on the supply voltage, motor connection method and duty level. For 230 V applications, the ATS48D17Q supports approximately 3 kW for severe-duty in-line applications and 4 kW for standard-duty in-line applications. When connected to the motor delta terminals, the corresponding ratings are approximately 5.5 kW for severe-duty and 7.5 kW for standard-duty applications.

At 400 V, the applicable ratings are approximately 5.5 kW for severe-duty in-line applications and 7.5 kW for standard-duty in-line applications. With an inside-delta connection, the unit can support approximately 11 kW for severe-duty applications and up to 15 kW for standard-duty applications.

The motor’s rated current should be used as a primary selection parameter rather than relying only on the motor’s kW rating. Starting time, load torque, number of starts and the selected connection method should also be evaluated.

3. What supply voltage does the ATS48D17Q support?

The ATS48D17Q is designed for three-phase AC supply systems from 230 to 415 V. The specified supply tolerance is approximately -15% to +10%, while the normal operating frequency is 50–60 Hz with a frequency tolerance of approximately ±5%.

Before commissioning, the incoming power supply should be checked against the soft starter specifications and the motor nameplate. The three phases should have suitable voltage balance, and the phase sequence and wiring should be verified.

The ATS48D17Q can be connected either in the motor supply line or to the motor delta terminals. These two configurations have different current and motor power characteristics, so the power wiring must correspond to the selected installation method.

4. How does the ATS48D17Q reduce motor starting stress?

The ATS48D17Q controls the motor’s starting torque and acceleration rather than allowing the motor to receive full supply voltage instantaneously. This provides a gradual increase in motor speed and helps reduce the mechanical shock generated during startup.

Direct-on-line starting can cause a high current surge and a sudden increase in motor torque. For machines with belts, couplings, gearboxes, pumps or other mechanical transmission components, these sudden changes can place unnecessary stress on the equipment.

By using controlled acceleration, the ATS48D17Q can make the transition to normal motor speed considerably smoother. This is especially useful for pumps and conveyor systems where abrupt acceleration can affect both the mechanical equipment and the process.

The starting parameters should nevertheless be adjusted according to the actual load. An excessively short starting time may result in insufficient torque control, while an excessively long starting time can increase thermal stress on the motor and starter.

5. What protection functions are available on the ATS48D17Q?

The ATS48D17Q provides integrated thermal protection for both the motor and the soft starter, together with line phase-failure detection.

Motor thermal protection helps monitor the thermal load associated with motor operation. This is important when the motor is overloaded, accelerates slowly or is started repeatedly. Excessive thermal loading can otherwise cause motor insulation deterioration and premature equipment failure.

Starter thermal protection helps protect the internal power components from excessive temperature. During motor starting, the power semiconductors experience increased electrical and thermal stress, so appropriate thermal monitoring is essential.

Line phase-failure detection monitors the incoming three-phase supply. A missing phase can produce unbalanced motor currents and abnormal motor operation, making phase detection an important part of the overall protection system.

Protection settings should be matched to the actual motor nameplate data and operating conditions. Incorrect settings can lead to nuisance trips or inadequate protection.

6. Can the ATS48D17Q communicate with a PLC through Modbus?

Yes. The ATS48D17Q supports Modbus communication through an RS485 multidrop serial interface. The communication connection uses an RJ45 connector, and supported transmission rates include 4800, 9600 and 19200 bps.

This communication capability allows the soft starter to exchange available status, monitoring and diagnostic information with a PLC or other industrial automation controller. It can therefore be integrated into a larger motor control or process automation system.

During commissioning, the communication address, baud rate and other relevant settings must be configured consistently between the ATS48D17Q and the Modbus master. The RS485 wiring should also be checked for correct connection and network configuration.

If the PLC cannot communicate with the soft starter, troubleshooting should begin with the communication address, baud rate, RS485 wiring and RJ45 connection. Communication problems should be distinguished from power-stage faults because the motor starter may still operate locally even when network communication is unavailable.

7. Why might an ATS48D17Q trip when starting the motor?

A trip during startup can have several causes, so the first step is to identify the actual fault or protection condition reported by the soft starter. The motor nameplate data and ATS48D17Q configuration should then be compared carefully.

The motor’s rated current, starting torque and acceleration time should be checked. If the connected load requires excessive starting torque, the motor may take too long to accelerate, resulting in increased current and thermal stress.

The incoming three-phase supply should also be inspected for phase loss, voltage problems or significant imbalance. Motor terminals and the selected in-line or inside-delta connection should be verified because an incorrect connection can produce abnormal starting behavior.

Mechanical conditions should not be overlooked. A blocked pump, overloaded conveyor, tight bearing, excessive compressor pressure or other mechanical problem can prevent the motor from reaching operating speed.

For applications involving frequent starts, the starting frequency and time between starts should also be considered. Repeated starting can cause heat to accumulate inside the motor and soft starter, potentially resulting in thermal protection activation.

8. What should be considered when selecting and commissioning the ATS48D17Q?

When selecting the ATS48D17Q, the motor rated current should be compared with the starter rating, while the supply voltage, motor power, connection method and application duty should also be considered. The difference between standard-duty and severe-duty applications is particularly important because the permissible motor power changes accordingly.

During commissioning, the motor nameplate information should be entered or configured correctly. The starting torque, acceleration time, current limit and thermal protection parameters should then be adjusted to match the actual load.

The motor connection must also be verified. An ATS48D17Q used with an in-line connection has different applicable motor power ratings from the same starter used with an inside-delta connection.

The control circuit, discrete inputs, analog output and Modbus communication should be checked where these functions are used. After startup, technicians should monitor motor current, acceleration behavior, fault status and thermal conditions to confirm that the configuration is appropriate for the actual machine.

For replacement applications, it is also important to note that the ATS48D17Q has reached the end of commercialization, although service support for existing installations continues for a defined period. Schneider Electric lists the ATS480D17Y as a replacement option, but compatibility should be verified against the actual motor and control-system requirements before substitution.