Technical Specifications

FAQ

1. What is the main function of the Schneider ATS01N109FT soft starter?

The Schneider ATS01N109FT is designed to provide controlled starting of asynchronous AC motors by gradually increasing the voltage applied to the motor. Instead of applying full line voltage immediately, the soft starter uses a voltage-ramp starting method to reduce the mechanical shock and electrical stress normally associated with direct-on-line starting. This can help reduce starting current and mechanical stress on couplings, belts, pumps and other driven equipment. The unit is intended for relatively simple machine applications and is commonly used with pumps, fans, compressors and general-purpose machinery. It also incorporates an integrated bypass function, allowing the starter to reduce power losses during normal motor operation after the starting sequence has been completed.

2. What motor current and power ratings are supported by the ATS01N109FT?

The ATS01N109FT has a 9 A starter current rating and supports several motor power combinations depending on the supply voltage and motor configuration. The specified motor ratings include up to 4 kW for a three-phase 400 V motor, 1.5 kW for a three-phase 230 V motor, and 1.1 kW for a single-phase 230 V motor. Horsepower ratings include 1 hp at 210 V three-phase, 2 hp at 230 V three-phase, and 5 hp at 460 V three-phase. When selecting the soft starter, the motor’s actual full-load current is more important than motor power alone. The motor current should remain within the starter’s applicable current rating and operating category. Load characteristics, starting frequency, acceleration time and ambient temperature should also be considered when determining whether the ATS01N109FT is suitable for a particular application.

3. What is the starting method used by the ATS01N109FT?

The ATS01N109FT uses a voltage-ramp starting method. During motor startup, the soft starter progressively increases the voltage supplied to the motor rather than applying the full supply voltage instantly. This produces a smoother acceleration profile and can significantly reduce mechanical shock compared with direct-on-line starting. The starting time is adjustable from approximately 1 to 5 seconds, allowing the starting behavior to be adapted to the driven load. For a pump, for example, a controlled ramp can reduce sudden mechanical stress in the transmission system. For fans and other rotating machinery, it can provide a smoother acceleration process. The appropriate setting should be determined by observing the actual motor acceleration and ensuring that the motor reaches operating speed without excessive current or prolonged starting conditions.

4. Does the ATS01N109FT have an integrated bypass function?

Yes. The ATS01N109FT includes an integrated bypass function. After the motor has completed its controlled starting sequence, the bypass arrangement allows normal operating current to pass through the appropriate bypass path rather than continuously through the main soft-starting power components. This reduces power dissipation during normal operation and helps limit heat generation inside the control cabinet. The integrated bypass is particularly useful in applications where the motor operates continuously after starting. However, the bypass function does not eliminate the need for correct motor protection and upstream switching equipment. The complete motor circuit should still be designed with appropriate circuit protection, isolation and control components according to the machine’s electrical requirements.

5. What supply voltage can the ATS01N109FT operate with?

The ATS01N109FT is designed for a rated supply voltage range of 110 to 480 V AC, with specified supply limits extending from approximately 99 to 528 V AC. It can be used with both single-phase and three-phase motor applications depending on the applicable voltage and motor power configuration. The rated supply frequency is 50–60 Hz, with a network frequency range of approximately 47.5–63 Hz. Before commissioning, the actual line voltage should be measured and compared with the requirements of the motor and soft starter. The supply voltage must also correspond to the motor’s rated voltage. Using an unsuitable voltage can result in incorrect motor performance, excessive current, protection activation or equipment damage.

6. How should the starting time be adjusted on the ATS01N109FT?

The ATS01N109FT provides an adjustable starting time of approximately 1 to 5 seconds. The correct setting depends on the motor’s inertia, mechanical load and required acceleration characteristics. A short starting time allows the motor to reach full speed quickly, but it may result in higher starting current and greater mechanical acceleration forces. A longer ramp generally provides a smoother acceleration process and can reduce mechanical shock, but an excessively long starting period may cause unnecessary motor heating or prevent the motor from reaching operating speed efficiently. During commissioning, it is generally preferable to begin with a moderate setting and observe motor acceleration, current behavior and machine response. The setting can then be adjusted according to the actual load rather than using an unnecessarily aggressive ramp.

7. What should be checked if the motor does not accelerate correctly with the ATS01N109FT?

If the motor fails to accelerate normally, first check the incoming supply voltage and confirm that the motor is correctly connected for the selected voltage. The motor’s full-load current should also be compared with the 9 A starter rating and the applicable motor power range. Next, inspect the mechanical load for excessive resistance, blockage, seized bearings, abnormal friction or an unusually high starting torque requirement. The starting-time adjustment should also be checked. If the ramp is too long or the motor requires more starting torque than the soft starter can provide, the motor may remain at low speed for too long. The control circuit should be checked as well to confirm that the start command is reaching the soft starter correctly. If the motor hums without accelerating, abnormal current is observed, or the starter repeatedly enters a protective state, the motor, wiring and load should be inspected before continuing operation.

8. What installation and commissioning precautions should be followed for the ATS01N109FT?

Before installation, verify that the supply voltage, motor voltage, motor current and motor power are compatible with the ATS01N109FT. The soft starter should be installed in an appropriate control cabinet or electrical enclosure with sufficient ventilation and suitable environmental conditions. The unit is rated IP20, so it should not be exposed directly to water, conductive dust or other conditions outside its specified environment. Power and control wiring should be correctly separated and securely terminated. Appropriate upstream circuit protection and a suitable line contactor should be incorporated into the motor control circuit. During commissioning, check the phase and motor connections, verify the control supply, confirm the start command, and set the starting ramp according to the actual mechanical load. The motor should initially be tested without unnecessary mechanical stress, followed by verification under normal operating conditions. If abnormal noise, excessive current, unsuccessful acceleration or repeated protection activation occurs, the system should be stopped and the cause investigated before continued operation.