Basic function principles

RMS value (rms) specifications All AC value specifications in this documentation such as RMS specifications (rms) refer to a 50/60 Hz 3-phase mains network with a sinusoidal waveform.

The EL3773 has 6 analog input channels which are measured simultaneously in their respective measuring ranges. The properties are discussed below in the order of the data processing.

Input filter

Each channel has a 5^th order low-pass filter with Bessel characteristic which can be parameterized via the CoE setting 0x8000:15. The corresponding anti-aliasing filters are placed up or downstream and are adapted automatically.

The filter setting of channel 1 also applies to channels 2 to 6; the corresponding CoE object cannot be written in these channels. All 6 input channels are thus subject to the same filter characteristic.

The input filter cannot be deactivated.

Fig.95: Data flow diagram input filter

The following steps can be selected:

• 200 Hz
• 500 Hz
• 1 kHz
• 1.5 kHz
• 2.5 kHz
• 5 kHz
• 15 kHz

Fig.96: Filter setting via the CoE object "Filter settings" (Index 0x8000:15)

The amplitude curve can be represented accordingly:

Fig.97: Amplitude curve

Changes in the CoE directory In case of changes to the CoE default parameters, it is essential that corresponding values are entered in the start-up list, so that in the case of exchange the EL3773 operates again as foreseen in the application.