Technical specifications

3RT1955-4G

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In addition to soft starting and soft ramp-down, the solid-state SIRIUSВ 3RW44 soft starters provide numerous functions for higher-level requirements. They cover a performance range up to 710В kW (at 400В V) in the inline circuit and up to 1В 200В kW (at 400В V) in the inside-delta circuit.

The SIRIUS 3RW44 soft starters are characterized by a compact design for space-saving and clearly arranged control cabinet layouts. For optimized motor starting and stopping the innovative SIRIUS 3RW44 soft starters are an attractive alternative with considerable savings potential compared to applications with a frequency converter. The new torque control and adjustable current limiting enable the High-Feature soft starters to be used in nearly every conceivable task. They guarantee the reliable avoidance of sudden torque applications and current peaks during motor starting and stopping. This creates savings potential when calculating the size of the switchgear and when servicing the machinery installed. Be it for inline circuits or inside-delta circuits – the SIRIUS 3RW44 soft starter offers savings especially in terms of size and equipment costs.

The bypass contacts already integrated in the soft starter bypass the thyristors after a motor ramp-up is detected. This results in a further great reduction in the heat loss occurring during operation of the soft starter at rated value.

Combinations of various starting, operating and ramp-down possibilities ensure an optimum adaptation to the application-specific requirements.

Applicable standards

• IEC 60947-4-2
• UL/CSA

Functionality

Equipped with modern, ergonomic user prompting the 3RW44 soft starters can be commissioned quickly and easily using a keypad and a menu-prompted, multi-line graphic display with background lighting. The optimized motor ramp-up and ramp-down can be effected quickly, easily and reliably by means of just a few settings with a selectable language. Four-key operation and plain-text displays for each menu point guarantee full clarity at every moment of the parameterization and operation. During operation and when control voltage is applied, the display field continuously presents measured values and operating values as well as warnings and fault messages. An external display and operator module can be connected by means of a connection cable to the soft starter, thus enabling active indications and the like to be read directly from the control cabinet door.

The SIRIUSВ 3RW44 soft starters are equipped with optimum functionality. An integral bypass contact system reduces the power loss of the soft starter during operation. This reliably prevents heating of the switchgear environment. The SIRIUSВ 3RW44 soft starters have internal intrinsic device protection. This prevents thermal overloading of the power section's thyristors, e.g. due to unacceptably high closing operations.

Wiring outlay for installing an additional motor overload relay is no longer needed as the SIRIUSВ 3RW44 soft starters perform this function too. In addition they offer adjustable trip classes and a thermistor motor protection function. As an option the thyristors can also be protected by SITOR semiconductor fuses from short-circuiting so that the soft starter is still functional after a short circuit (coordination typeВ "2"). And even inrush current peaks are reliably avoided thanks to adjustable current limiting.

Optionally, SIRIUS 3RW44 soft starters can be upgraded with a PROFIBUSВ DP or PROFINET module. Thanks to their communication capability and their programmable control inputs and relay outputs the SIRIUSВ 3RW44 soft starters can be very easily and quickly integrated in higher-level controllers.

In addition a creep speed function is available for positioning and setting jobs. With this function the motor can be controlled in both directions of rotation with reduced torque and an adjustable, low speed.

On the other hand the SIRIUSВ 3RW44 soft starters offer a new, combined DC braking function for the fast stopping of driving loads.

Highlights

• Soft starting with breakaway pulse, torque control or voltage ramp, adjustable torque or current limiting as well as any combination of these, depending on load type
• Integrated bypass contact system to minimize power loss
• Various setting options for the starting parameters such as starting torque, starting voltage, ramp-up and ramp-down time, and much more in three separate parameter sets
• Start-up detection
• Inside-delta circuit for savings in terms of size and equipment costs
• Various ramp-down modes selectable: coasting down and torque-controlled ramp-down, pump stop, combined DC braking
• Solid-state motor overload and intrinsic device protection
• Thermistor motor protection
• Keypad with a menu-prompted, multi-line graphic display with background lighting
• Interface for communication with the PC for more accurate setting of the parameters as well as for control and monitoring
• Simple adaptation to the motor feeder
• Simple mounting and commissioning
• Display of operating states and fault messages
• Connection to PROFIBUS and PROFINET with optional PROFIBUSВ DP or PROFINET module
• External displays and operator modules
• Mains voltages from 200 to 690В V, 50 to 60В Hz
• Can be used up to 60В В°C (derating from 40В В°C)

Simulation Tool for Soft Starters

The Simulation Tool for Soft Starters (STS) provides a convenient means of designing soft starters using a simple, quick and easy-to-use interface, see "Parameterization, Configuration and Visualization with SIRIUS". Simply entering the motor and load data simulates the application and leads to suggestions being given for suitable soft starters.

SIRIUS Soft Starter ES and SIRIUS Soft Starter ES (TIA Portal) software programs

Both of these programs enable the quick and easy parameterization, monitoring and diagnostics of SIRIUSВ 3RW44В HighВ Feature soft starters for service purposes, see "Parameterization, Configuration and Visualization with SIRIUS".

SIRIUS 3RW44 Soft Starter block library for SIMATIC PCS 7

The SIRIUS 3RW44 soft starter PCS 7 block library can be used for simple and easy integration of SIRIUS 3RW44 soft starters into the SIMATIC PCS 7 process control system. See "Parameterization, Configuration and Visualization for SIRIUS".