Siemens 3RW4026-1BB04 Soft starter

Siemens SIRIUS 3RW4026-1BB04 Soft Starter Overview

The Siemens SIRIUS 3RW4026-1BB04 is a compact, high-performance soft starter designed for the gentle and smooth starting and stopping of three-phase asynchronous motors. It belongs to the SIRIUS 3RW40 series, which is known for its space-saving design and easy commissioning, making it an ideal choice for various industrial applications where direct-on-line starting is not suitable due to high current peaks or mechanical stress.

Product Detailed Description

• Function: The primary function of the 3RW4026-1BB04 soft starter is to reduce the starting current and torque of a motor during startup and shutdown. Instead of applying full voltage directly (which causes high inrush currents and mechanical shocks), it gradually increases the voltage to the motor until it reaches full speed. Similarly, during stopping, it can gently reduce the voltage (soft stop). This process minimizes mechanical stress on the motor and connected machinery, reduces current peaks on the power supply, and extends the lifespan of the entire system.

• Built-in Overload Protection: This particular model (and the 3RW40 series in general) integrates solid-state motor overload protection, eliminating the need for a separate thermal overload relay in many applications. This feature contributes to its compact design and simplifies wiring.

• Bypass Function: The 3RW40 soft starters feature an integrated bypass contact system. Once the motor has reached its nominal speed, the soft starter's thyristors are bypassed by mechanical contacts. This reduces power dissipation and heat generation in the soft starter during normal operation, making it highly energy-efficient.

• Adjustable Parameters: Key parameters like ramp-up time, starting voltage, and current limiting can be adjusted to precisely match the specific motor and application requirements.

• Control and Indication: It features control terminals for start/stop commands and indication terminals for operational status.

Product Parameters

(Based on the model number 3RW4026-1BB04)

• Product Family: Siemens SIRIUS 3RW40 Soft Starters

• Rated Operational Current (Ie): 25 A (at 40 °C ambient temperature)

• Rated Power for Standard Applications (400 V AC, 40 °C): 11 kW

• Operating Voltage (Ue): 200 - 480 V AC (for the motor circuit)

• Control Supply Voltage (Us): 24 V AC/DC

• Connection Type: Screw terminals for main and control circuits

• Size: S0 (Standard size for Siemens SIRIUS devices)

• Integrated Protection: Solid-state motor overload protection

• Integrated Bypass: Yes, internal bypass contact system

• Adjustable Start Parameters: Ramp-up time, starting voltage, current limiting

• Degree of Protection (IP): IP20 (Finger-safe, protection against solid objects > 12.5mm)

• Operating Temperature: -25 to +60 °C (derating may apply above 40 °C)

• Mounting: DIN rail or screw mounting

• Dimensions (approx.): (Typical for S0 size) approx. 45 mm (W) x 125 mm (H) x 150 mm (D) - confirm with exact datasheet

Product Advantages

• Smooth Start and Stop: Significantly reduces mechanical stress on motors, gears, belts, and other drive components, leading to longer equipment lifespan.

• Reduced Current Peaks: Avoids high inrush currents during startup, which can cause voltage sags in the power supply and interfere with other electrical equipment.

• Integrated Protection: Built-in overload protection simplifies wiring and reduces panel space compared to separate contactor-overload relay solutions.

• Energy Efficiency (Bypass): The integrated bypass contact system minimizes power losses and heat generation once the motor reaches full speed, saving energy during operation.

• Space-Saving Design: Its compact S0 size is ideal for installations where panel space is at a premium.

• Easy Commissioning: Simple setup and parameter adjustment make it user-friendly.

• Cost-Effective: Often a more economical solution than using a full-blown Variable Frequency Drive (VFD) for applications that only require soft starting and stopping.

• Global Standard: As a Siemens product, it adheres to high quality standards and has widespread support.

Precautions

• Correct Sizing: Ensure the soft starter is correctly sized for the motor's nominal current, power, and the application's load characteristics. Over- or undersizing can lead to reduced performance or damage.

• Environmental Conditions: Install the soft starter within its specified operating temperature and humidity ranges. Ensure adequate ventilation to prevent overheating, especially if installed in a crowded cabinet.

• Power Supply: Verify the control supply voltage (24 V AC/DC) and main circuit voltage (200-480 V AC) are correct and stable.

• Wiring: Follow the wiring diagrams in the Siemens manual meticulously. Ensure proper conductor sizing, correct terminal connections (screw terminals), and secure grounding.

• Overload Protection Settings: Properly set the integrated overload protection current (motor rated current) to ensure effective motor protection.

• Bypass Consideration: While it has an internal bypass, for some very heavy-duty or critical applications, an external bypass contactor might be considered for redundancy or even longer lifespan (though typically not necessary for the 3RW40).

• Arcing: Like any power switching device, be aware of potential arcing during switching operations, especially if not used within specifications.

• Motor Cable Lengths: For very long motor cables, capacitive effects might need to be considered, though less critical for soft starters than VFDs.

• Maintenance: Periodically check terminals for tightness, inspect for signs of overheating, and ensure cooling vents are clear.

Product Applications

The Siemens SIRIUS 3RW4026-1BB04 soft starter is ideal for a wide range of applications where smooth motor startup and shutdown are beneficial or necessary:

• Pumps: Preventing water hammer effects in pumping systems, reducing strain on pipes and pumps.

• Fans and Blowers: Smooth acceleration and deceleration to prevent belt slippage and mechanical stress on fan blades and bearings.

• Conveyors: Gentle start-up prevents product shifting, jolting, and belt wear.

• Compressors: Reducing mechanical shock and wear on compressor components during startup.

• Mixers and Agitators: Smooth starting prevents sudden jolts and ensures even mixing.

• Textile Machines: For gentle acceleration of spinning and weaving machines.

• Woodworking Machines: Reducing startup stress on blades and drive systems.

• General Machinery: Any application with three-phase asynchronous motors where a controlled start and stop can improve machinery lifespan and reduce electrical stress.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapor

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