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DU/dt filters

Product catalog summary

Overview of DU/dt Filters:
DU/dt filters are designed to protect motors by reducing the dU/dt value of the drive output voltage. This reduction helps in lowering motor temperature, increasing motor lifespan, and reducing insulation stress on motor windings. These filters are suitable for use with cable lengths up to 300 meters and are constructed using UL-listed materials in an open frame design.

Specifications:

Rated Current: Choose a filter with a rated current greater than the motor's rated current.
Operating Voltage Range: 3x200-690 Vac ±10%
Motor Frequency: 0-70 Hz without derating, 70-320 Hz with derating
Max Switching Frequency: 4 kHz
Typical Overshoot: 50% of DC link voltage
Voltage Loss: Less than 5V at nominal current
Ambient Temperature: -20 to +40 °C in operation
Storage Temperature: -20 to +70 °C
Humidity: Less than 95% RH, no condensation
Overload Capacity: 1.5 times rated current for 1 minute, once per 60 minutes
Insulation Temperature Class: H 180 °C
Protection Class: IP00

Performance and Application:

DU/dt filters are effective in reducing voltage stress on motor windings, thereby extending their lifespan.
They are suitable for retrofit applications where motors are not originally designed for variable speed drives.
Filters are designed for a maximum switching frequency of 4 kHz, with lower frequencies generating less heat.

Technical Data and Recommendations:

For motors rated at voltages up to 500Vac, the insulation system should withstand peak voltages as per IEC TS 60034-17 standards.
Refer to Gambica/Rema technical report No. 1 for more information on dU/dt limits.
When cable length exceeds the maximum value, use a filter one size larger to prevent overheating.

Mechanical Data:
Detailed mechanical dimensions and weights are provided for various rated currents, ranging from 12A to 1500A, including water-cooled options.

Conclusion:
DU/dt filters are essential components for protecting motors in variable speed drive applications, ensuring reduced stress and extended motor life. Proper selection and application of these filters are crucial for optimal performance.

Catalog excerpts

DU/dt Filters

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DU/dt Filters - Protects the motor-reducing dU/dt value of the drive output voltage - Reduction of motor temperature - Increases the lifetime of the motor - Open frame design - UL listed materials used - Cable length up to 300m Motor winding insulation experiences higher voltage stress s e when used with a variable speed drive than when con ected n directly to the mains supply. The higher stresses de end on p the motor cable length. The stresses are caused by the fastrising voltage pulses of the drive and transmission line effects in the cable. DU/dt filters reduce the insulation stress of the...

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The waveform of the motor voltage without dU/dt- filter The waveform of the motor current with dU/dt- filter The typical voltage pulse shape in the terminals of the motor with dU/dt- filter The typical voltage pulse of the inverter output and the voltage pulse of the motor input with dU/dt- filter. Technical specifications Standards Design Operating voltage range Motor frequency Max switching frequency Typical overshoot Rated current Open frame design 3x200-690 Vac ±10% 0-70 Hz without derating 70-320 Hz with derating 4 kHz 50 % of DC link voltage Voltage loss Ambient temperature Storage temperature...

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filters / du/dt filters / 12-3000a, type dudt Busbar 7x11 Busbar Ø11 Busbar Ø14 Busbar Ø14 Busbar 14x24 Busbar Ø14 Busbar 2xØ14 Busbar 2xØ14 Busbar 4xØ14 Busbar 4xØ14 Busbar 4xØ14 Trafox is a brand of Muuntosähkö Oy. We develop, manufacture and customise high-quality transformers, chokes, filters and Trafox Superintend® monitoring devices for a large number of applications. – Muuntosähkö Oy Trafox P.O. Box 10 | FI-00621 Helsinki | Tel. +358 207 933 700 | Fax +358 207 933 746 | [email protected]

Open the catalog to page 4

DU/dt filters

DU/dt filters

Catalog excerpts

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