Ultraflux UF 831, Руководство пользователя, Страница: 45 / 109

45
NT UF 831 CO GB (b) / March 2014
5) Relay output module
Each relay output may be configured according to one of the following operating modes:
 Open:
The relay remains constantly off.

Closed:
The relay is on if the UF 831 is powered on, and off if it is not powered on. This choice
therefore allows the relay to be used to detect the presence of the power supply (positive safety).
 Totalizer: The relay generates a pulse with an adjustable width on each incrementation of the
selected totalizer.
The pulse width must then be defined, determining the time for which the relay remains closed (the
relay, initially off, is then on for half of the period, then off again for at least the same duration).
Care must therefore be taken, for a given pulse weight, not to choose a pulse width which is too
large, since the metering pulse frequency then risks being greater than the maximum frequency of
the relay. The relay would then suffer an ever-increasing delay with regard to the totalizer.
The table below shows the possible pulse widths and the corresponding maximum frequencies:
1 ms 1000 Hz
10 ms 100 Hz
50 ms 20 Hz
100 ms 10 Hz
200 ms 5 Hz
500 ms 2 Hz
1000 ms 1 Hz