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This document describes the Siemens 3RW402, 3RW403, and 3RW404 Soft Starters, which are designed for the soft starting of three-phase asynchronous motors. These devices are used to reduce mechanical stress on the motor and the driven machine, as well as to minimize current peaks during startup, thereby protecting the electrical supply system.
The Siemens 3RW40 soft starters provide a controlled ramp-up of the motor voltage, ensuring a smooth and gentle acceleration. This controlled acceleration helps prevent sudden jolts and wear on mechanical components such as gears, belts, and couplings. By limiting the inrush current, these soft starters also reduce voltage dips in the power supply, which can be critical in systems with sensitive loads or limited power capacity.
The devices feature an integrated bypass function, which, once the motor has reached its full speed, switches the motor directly to the mains supply. This bypass reduces power losses and heat generation within the soft starter, improving efficiency and extending the lifespan of the device. The bypass function is indicated by the "BYPASSED" status.
Overload protection is a key feature, safeguarding the motor from thermal damage due to excessive current. The soft starters incorporate an electronic overload relay that monitors the motor current and trips the circuit if an overload condition persists beyond a set time. The overload class can be adjusted (e.g., Class 10, 15, 20) to match the specific motor and application requirements. An "OVERLOAD" status indicator is provided.
The soft starters also offer various reset modes, including manual, remote, and automatic reset, allowing for flexible integration into different control systems. The "RESET MODE" selector enables users to choose the desired reset behavior after a trip event.
The 3RW40 soft starters are designed for three-phase operation. They are suitable for a supply voltage (Us) of 24 V ±20% for the control circuit (3RW40...-B0) or 110-230 V -15%/+10% (3RW40...-B1). The main power connections are designated L1, L2, L3 for input and T1, T2, T3 for output to the motor.
The devices are available in different sizes, with the 3RW402, 3RW403, and 3RW404 models having varying dimensions and current ratings. For instance, the 3RW402 has dimensions of 125 mm (a), 92 mm (b), 149 mm (c), 16.4 mm (d), 63 mm (e), 5 mm (f), 6.5 mm (g), 35 mm (h), 153 mm (k), 149 mm (l), and 150 mm (m). The 3RW403 and 3RW404 models are progressively larger to accommodate higher current capacities.
Tightening torques for terminals are specified: 3RW402 requires 1 Nm / 9 lbf in, 3RW403 requires 2 Nm / 18 lbf in, and 3RW404 requires 2 Nm / 18 lbf in. These specifications are crucial for ensuring proper electrical connections and preventing loose contacts.
The control terminals include A1/A2 for the control supply, 13/14 for the "RUN" status, and 23/24 for the "BYPASSED" status. Additional terminals (T11/T21, T12, T22, 95, 96, 98) are available for various control and signaling functions, such as fault indication and remote control.
The soft starters are designed for ambient temperatures up to 40°C. For temperatures exceeding this, derating may be necessary. The devices are suitable for mounting on a DIN rail or with screws.
The 3RW40 soft starters offer several usage features that enhance their versatility and ease of integration:
The Siemens 3RW40 soft starters are designed for minimal maintenance, primarily focusing on ensuring proper installation and environmental conditions:
In summary, the Siemens 3RW40 soft starters are robust and reliable devices designed to provide smooth, controlled starting of three-phase asynchronous motors, offering significant benefits in terms of mechanical protection, electrical system stability, and energy efficiency. Their comprehensive features and ease of integration make them suitable for a wide range of industrial applications.
General| Brand | Siemens |
|---|---|
| Model | SIRIUS 3RW402 |
| Category | Controller |
| Language | English |
