October 29, 2018
Innovation for power electronics
- November 27 to 29, 2018
- Tuesday and Wednesday: 9:00 to 18:00
Thursday: 9:00 to 17:00
- Exhibition Centre Nuremberg
Karl-Schoenleben-Strasse, Nuremberg, Germany
- Hall 4, TDK Stand 121
Welcome to TDK at SPS/IPC/DRIVES 2018, the international exhibition and conference for electric automation and drive technology in Nuremberg, Germany! On the TDK stand TDK is presenting its broad portfolio of EMC filters as well as chokes for converters. Convince yourself about the innovative EPCOS products.
We’re looking forward to your visit!
Compact, high-performance 3-line EMC filters
The B84243* series of EPCOS 3-line EMC filters has been expanded to include 10 new types for currents of up to 280 A. All 18 types in the series are designed for a rated voltage of 530 V AC. The performance of this series of filters has been optimized for adherence to limit values in accordance with EN 61800−3:2004+A1:2011 for motor cable lengths of either up to 25 m (C1) or 50 m (C2). The metal cases of the filters are designed with IP20 protection and, depending on the type, have compact dimensions of between 190 mm x 40 mm x 95 mm and 450 mm x 170 mm x 230 mm. Thanks to the highly saturation resistant chokes, parasitic asymmetric currents can be reliably controlled even in the case of longer motor cables.
A further advantage of the B84243* series is the low leakage current that also permits operation in a 30 mA RCD environment. For smaller, hand-operated equipment the leakage current must be below 3.5 mA. For this reason, the 3-A version (B84243A8003U000) has been designed for a leakage current of 1.9 mA at 400 V AC. One important safety aspect is the short discharge time to <60 V within one second for the types rated at up to 44 A.
Typical applications of the filters are frequency converters for the drives of elevators, pumps, conveyor systems, and HVAC systems.
LeaXield™ minimizes earth leakage currents
The EPCOS LeaXield™ active filter module is solution for the minimization of earth leakage currents in power drive systems with frequency converters. Leakage current can cause RCDs (residual current device) to trip. In some applications this means that RCDs with low thresholds such as 30 mA cannot be used, or only with substantial additional expense. The LeaXield active filter module is connected between the RCD (residual current device) and the EMC input filter of the converter in standard three-phase industrial power grids and does not require an additional power supply. LeaXield detects the common-mode currents on the load-side via a current sensing transformer. An amplifier generates an inverse of the leakage currents and feeds them to the power line via a capacitor network. This produces almost complete cancellation of the leakage currents. LeaXield is now designed for rated currents of up to 150 A for 3-phase grids at frequencies of 50/60 Hz and a rated voltage of 520 V AC. The new active filter can be used in systems with leakage currents of up to 1000 mA. Besides minimizing earth leakage currents, LeaXield active filter modules can also improve the EMC performance of power drive systems in the range up to around 500 kHz. The new active filter module achieves typical common-mode attenuation values of up to 30 dB at 4 kHz, 40 dB at 10 kHz, and 15 dB at 150 kHz.
LCL filters for recuperative frequency converter systems
The B84143*405 series of EPCOS LCL filters is especially suitable for recuperative frequency converter systems. These high-performance filters consist of a power choke, a capacitor bank with damping resistors and a robust choke. The corresponding filter circuits attenuate the clock frequencies so greatly that the IEC/TS 62578 recommendations for EMI emissions between 9 kHz and 150 kHz can be satisfied. Moreover, in combination with a recuperative frequency converter system, the LCL filters can significantly reduce the line-side harmonics to less than 5 percent. Thanks to the integration of the choke in the LCL filter, the recuperative unit can also be operated as a boost converter for higher DC link voltages. The LCL filters are designed for rated currents of 16 A, 66 A, 200 A, and 400 A at a rated voltage of 520 V. The two smaller versions (16 A and 66 A) are accommodated on a mounting plate for ease of use. The larger versions (200 A and 400 A) consist of two units: a separate storage choke and a mounting plate with power choke and capacitor bank. The filters are designed for clock frequencies of 7 kHz to 16 kHz for the feedback module and 4 kHz to 16 kHz for the motor-side frequency converter module. In addition, they are designed for a maximum motor lead length of 150 m or 6 axles and a maximum motor frequency of 100 Hz.