We are still there for you!

Posted on 20 March 202020 March 2020 by AM

In times like these, one of the greatest strengths of humanity comes into play: we use the tools of cooperation and solidarity to solve problems and thereby – in the case of the new coronavirus SARS-CoV-2 – protect the weak members of our society. Of course, we as EPA GmbH also play our part in slowing the spread of the virus as much as possible (#FlattenTheCurve), in order to give scientists as much time as possible to develop a vaccine and to relieve the health care system as much as possible!

Wherever possible, our departments work from the home office or, where this is not possible, in shifts (for example in the shipping department).

Either way, you can still reach us as usual:

By phone at +49 (0) 6181 9704 – 0 (or your personal contact person at the known numbers)
And by e-mail at info@epa.de

Let’s make the best of it!

Even though the current situation is a great challenge for all of us, it also offers opportunities: If you want to use the quieter time to improve your system, for example, in terms of personal and/or operational safety, to replace the aging frequency or servo inverters for which there is no replacement, or to finally get to the bottom of the annoying EMC problem, you know who to turn to!

Stay healthy!

etgo, our new sales partner in Italy

Posted on 18 January 201725 January 2017 by AM

We are looking forward to welcoming a new sales partner, etgo Srl, with the start of the new year.

Originally established as a trading company for electric drive technology, etgo decided in 2015 to expand its range of products to include handling, control and process technology.

With 20 years of experience in the field of industrial automation, we are convinced that we have found the right partner to successfully extend our sales region to Italy and look forward to a good cooperation.

EPA GmbH image video

Posted on 08 February 201624 May 2018 by AM

Who is the EPA GmbH and what can they do for us? This video provides an answer.

Note: Clicking the play button will establish a connection to the servers of YouTube and thus data will be transferred there. More information on this topic can be found in the data protection declaration.

Trade fair video

Posted on 23 February 201524 May 2018 by AM

To give the visitors of the various trade fairs a brief introduction of who we are and what we could do for them, we have created this Video.

Trade fairs 2015

Posted on 23 February 201529 March 2016 by AM

We invite you to visit EPA on traid fair!
Discover new products in the EMC and filter technology


18.-20.03.2015 in Stuttgart	24.-26.03.2015 in Stuttgart

25.03.2015 in Würzburg	19.-21.05.2015 in Nürnberg (Nuremberg)

13.-17.04.2015 in Hannover	24.-26.11.2015 in Nürnberg (Nuremberg)

Leakage current reduction with DAR filter

Posted on 23 February 201529 March 2016 by AM

Operating a frequency inverter at a RCD can be a challenge!

EMC measures (such as RFI filters, motor filter, shielded motor cables) increase the leakage current to values that often force the RCD to trip. Residual current circuit breakers are incapable of recognising this key distinction between operational leakage current on the one hand and fault current from human contact or insulation defects on the other. RCDs with a conventional tripping of 30 mA (VDE 0100-410) are required for personal protection and with 300 mA or 420 mA (VDE 0100-482) for fire protection. Since the introduction of the AC/DC sensitive RCD (type B) and the effect of mandatory standards and policies that commit to its use, many plant operators are looking for solutions to prevent accidental tripping of the safety device.

Even RCDs with a rated residual current of 300 mA can not always be used without any problems, so the figures 1 and 2 show. In our example, a 1.5 kW three-phase AC motor was operated at a frequency inverter with 50 meters of shielded motor cable. In the time signal of the leakage current (Fig. 1), one can clearly see that peaks occur up to 1500 mA. The switching frequencies of the frequency inverters, which are usually in the range between 2 kHz and 16 kHz, are especially crucial with long motor cable lengths. By means of a Fourier analysis it is clear that the inverter switching frequency is set to a value of 6 kHz. The amplitude reaches here 450 mA rms (Fig. 2), which is well above the tripping threshold of the AC/DC sensitive RCD (red line). During the starting or stopping of the drive, this value is even much higher.

This is where the leakage current reduction filter NF-DAR puts things right. If you connect a NF-DAR filter between a RCD and frequency inverter, the leakage currents in the switching frequency range are reduced to a minimum (Fig. 3-4). The operation of one or more frequency inverters is thus possible again without problems!