Technical Specifications

FAQ

1. What is the main function of the Schneider ATS48C59Q soft starter?

The Schneider Electric ATS48C59Q is an Altistart 48 soft starter designed to control the starting and stopping of three-phase asynchronous motors. Instead of applying full motor voltage immediately, the soft starter controls the motor’s electrical supply during acceleration, helping reduce starting current and mechanical stress.

The ATS48C59Q uses torque-controlled soft-start technology and is intended for demanding industrial applications, including heavy-duty machinery and pump systems. It is rated for high-current motor applications and can operate with motors connected either directly in the motor supply line or using an inside-delta configuration.

During starting, the soft starter gradually increases the effective voltage applied to the motor so that acceleration is smoother than with direct-on-line starting. It can also provide controlled stopping, motor thermal protection, starter thermal protection, and phase-failure monitoring. These functions make the ATS48C59Q suitable for applications where reducing mechanical shock and controlling motor acceleration are important.

2. What motor power range is supported by the ATS48C59Q?

The ATS48C59Q is designed for high-power three-phase asynchronous motors, with the applicable motor power depending on the supply voltage, connection method, and duty classification.

At 230 V, the device can be used with motors from 132 kW to 250 kW depending on whether the motor is connected in the motor supply line or through the motor delta terminals and whether the application is classified as standard or severe duty. At 400 V, the applicable motor power can range from 250 kW to 400 kW under the corresponding connection and duty conditions.

This means that motor selection should not be based only on the maximum 400 kW figure. The actual application must be evaluated according to motor current, operating duty, starting conditions, supply voltage, connection method, and thermal requirements. Correct sizing is particularly important for heavy-duty applications where repeated starts or long acceleration times can increase thermal stress on the soft starter.

3. What supply voltage and frequency does the ATS48C59Q support?

The ATS48C59Q is designed for a three-phase AC operating voltage of 230–415 V with a supply frequency of 50–60 Hz. The applicable supply voltage must remain within the permitted range for the specific installation.

The selected motor and soft starter configuration must also be compatible with the actual power system. When commissioning the equipment, technicians should verify the incoming line voltage, motor nameplate information, phase sequence, and motor connection before enabling the starter.

The ATS48C59Q supports both in-line and inside-delta motor connection arrangements. These two connection methods have different current relationships and motor power capabilities, so the correct configuration must be selected during installation and parameter setup.

4. How does the ATS48C59Q reduce motor starting stress?

The ATS48C59Q controls the motor’s acceleration instead of allowing the motor to receive the full electrical supply immediately. This controlled starting process reduces the sudden current and torque changes associated with direct-on-line starting.

For mechanical systems such as pumps, compressors, conveyors, and heavy industrial machinery, reducing the initial torque shock can help minimize stress on couplings, gearboxes, shafts, belts, and other mechanical components. It can also reduce disturbances to the electrical supply caused by high motor starting current.

The ATS48 series uses torque-control functions to achieve controlled acceleration rather than relying only on a simple voltage ramp. The actual starting parameters should be adjusted according to the motor characteristics and load requirements. An excessively long acceleration time can increase thermal loading, while an overly aggressive setting may fail to provide the desired mechanical benefits.

5. What protection functions are available on the ATS48C59Q?

The ATS48C59Q incorporates several protection functions intended to protect both the motor and the soft starter during operation. These include motor thermal protection, starter thermal protection, and line phase-failure detection.

Motor thermal protection helps monitor the thermal condition associated with motor operation, which is particularly important when the motor experiences heavy loading or repeated starting cycles. Starter thermal protection helps prevent excessive thermal stress within the soft starter’s power components.

The device also monitors line phase conditions. A phase failure can cause abnormal motor current and uneven motor operation, so detecting this condition allows the system to respond before prolonged operation causes additional problems.

Protection settings should be configured according to the actual motor nameplate data and application conditions. Incorrect protection settings can either cause nuisance trips or provide insufficient protection, so commissioning should include verification of the relevant motor and starter parameters.

6. How can the ATS48C59Q communicate with a PLC or automation system?

The ATS48C59Q provides 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.

Through the communication interface, the soft starter can exchange operating information and control-related data with an automation system such as a PLC or supervisory controller. This can allow centralized monitoring of motor status, starter status, operating parameters, and diagnostic information.

When integrating the ATS48C59Q into a control network, the communication parameters must be configured consistently with the master device. Network addressing, baud rate, wiring, termination, and communication settings should all be checked during commissioning. A communication problem should be distinguished from a power-stage or motor fault because the motor and starter can remain electrically functional even when communication with the PLC is unavailable.

7. What should be checked if the ATS48C59Q trips during motor starting?

If the ATS48C59Q trips during starting, the first step is to identify the specific diagnostic or protection condition rather than immediately changing the starter. The motor nameplate data, starting current, acceleration time, load characteristics, and selected starting parameters should be reviewed.

The motor and mechanical load should also be checked for excessive resistance or mechanical blockage. A pump, conveyor, compressor, or other driven machine with abnormal mechanical loading can require substantially more starting torque than expected, causing the starter to remain in the acceleration phase for too long.

Electrical conditions should also be examined, including supply voltage, phase balance, motor connections, and incoming phase continuity. If the starter detects a phase-related problem, the line supply and motor wiring should be checked before adjusting software parameters.

For repeated-start applications, the number of starts, starting duration, and recovery time between starts should also be considered. Excessive repeated starting can create thermal stress even when individual starts appear normal. Troubleshooting should therefore consider the complete electrical, mechanical, and thermal operating conditions.

8. Can the ATS48C59Q be used for both standard-duty and heavy-duty applications?

Yes. The ATS48C59Q can be configured for different application conditions, but the permissible motor power and operating characteristics depend on the duty level, motor connection, supply voltage, and starting requirements. Schneider’s specifications distinguish between standard and severe applications, particularly when determining the applicable motor power.

For example, at 400 V, the ATS48C59Q can support up to 315 kW for a standard in-line application, while higher motor power ratings are possible under specified inside-delta configurations. Severe-duty applications have different permissible ratings because the thermal and starting requirements are more demanding.

Before selecting the ATS48C59Q, the motor’s rated current, load torque, acceleration time, number of starts per hour, supply voltage, and connection method should be evaluated. Correct application sizing is more important than simply matching the motor’s nominal kW rating. This is especially true for pumps and heavy industrial machinery where starting conditions can vary significantly with the process load.