Manual DTSG 4-Reversible
MSF-Vathauer Antriebstechnik GmbH & Co KG Am Hessentuch 6-8
32758 Detmold Tel: ++49 (0) 5231-66193+63030 Fax: ++49 (0) 5231-66856
Page 7 of 25
European EMC directive
If the digital-clock-switching device is installed according to the recommendations of this manual it
fulfills the requirements of the EMC directive according to the EMC product norm for motor driven
systems EN 61800-3.
2. Assembly and Installation
2.1 Cabling directives
The digital-clock-switching devices are developed for the operation in industrial environments where
high values of electromagnetic interferences are expected. In general, a professional installation
ensures a riskless and error-free operation. If limits are required that exceed the EMC directive limits,
the following directives are recommended.
1. Please make sure that all devices in the control cabinet are connected together at a shared
grounding point or rail with short cores and great diameter are properly grounded. It is
especially important that every control device connected to digital-clock-switching device (e.g.
automation devices) is connected via a short core with high diameter at the same grounding
point like the digital-clock-switching device.
2. The PE conductor of the drive controlled by the digital-clock-switching device should
preferably directly connected to the ground connection connected with the heat sink together
with the PE of the power supply of the concerning inverter. The existence of a central
grounding rail within the control cabinet and the connection of all ground cables to this rail
normally guarantee an error-free operation.
3. As far as possible you should use screened cables for the control. The cable ends have to be
terminated carefully and it must be taken care that the cores are not unscreened over long
distances. The screen of analog set point cables should only be grounded at the frequency
inverter single-sided. Not used cores of the control cores should be grounded.
4. The control cores have to be laid in the most possible distance from the load cores using
separated cable trenches etc. Cable crosses should possibly get an ankle of 90°.
5. Make sure that contactors and relays in the control cabinets are suppressed either by RC
connection or varistors in case of ac contactors or by „ free wheeling diodes“ at dc contactors,
where the dejam devices have to be connected at the contactor coil. The dejamming is
especially important when the contactors are controlled by the relays in the digital-clock-
switching device.
At installation of the digital-clock-switching device you must not disregard safety directives!
2.2 Measures to secure EMC
The following measures are to secure the EMC, which are of absolute necessity to the inverter
technology. The inverter fulfills the demands of the high noise immunity and the slight-noise emissions
for the usage in industries, under the guidelines of this manuals installation consideration.
2.3 Grounding, earthen, potential compensation
The correct professional grounding or earthen guarantees the protection of the staff against
dangerous touch voltages (input, output and intermediate circuit voltage). Parasitic currant inductance
and low-impedance potential compensation are important measures to reduce electromagnetic
influences.
