Hf Pulse Outputs (High Frequency); Scope; System Preconditions - Elster EK280 Applications Manual

EK280
e) Setting up pulse duration:
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Parametrization of the pulse duration via the EK280 keyboard is only possible with software
version 2.20 or later.
Older software versions may be programmed using enSuite via
"Parameters" and the paths described (see Chapter 6.2.1, 6.4.1)
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The pulse duration can be set as a multiple of 125 ms for each output.
 When in the corresponding menu press the button  until "PW.O1", "PW.O2",
is displayed.
Press the ENTER  button. The actual parameterized value flashes.

 Move the cursor to the digits using the  or  arrow keys and update them using the  or  arrow
keys to set the desired period.

Press the ENTER button to confirm the value setting. Input can be canceled using the ESC key.

6.5 HF Pulse outputs (high frequency)

6.5.1 Scope

The connection of a frequency-current converter, e.g. from the "Turck" company to one of the two HF
outputs(DA2, DA3) of the EK280 allows output of a proportional current signal (0-20 mA or 4-20 mA) for display
of the instantaneous load (Qb, Qm) or the metering period values (T, p). An output for volume Vn or Vm is not
possible.

6.5.2 System preconditions

EK280
The EK280 from software version V2.10 upwards may output pulses proportional to the load (e.g., Qn or Qb)
or measurements (T, p), through its HF output. These may be transformed into a current signal through a
frequency/current converter (FSU), e.g., 0 or 4 - 20 mA.
The maximum output frequency is approx. 1000 Hz. If an FE260 is used for Ex isolation, the maximally usable
output frequency is reduced to approx. 500Hz max.
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An external power supply is needed for the EK280.
The current output the load determined with the EK280 directly. This loading should be made
up in conjunction with an HF signal on the input side so as to facilitate a plausible calculation.
However, in principle this load can also be determined from LF or encoder input signals.
However, software filters cause significant damping here, so that control by means of this
current signal is not recommended.
FE260 / FSU
Connection of an FSU to the FE260 via output 2 is possible from version V15 upwards. If the EK280 is installed
in explosion-protected zone 1, an FE260 must be used for isolation of the outputs and the power supply in the
event of explosion.
If output 3 of the EK280 is also to be routed through the FE260 as an F output, this is only possible with an
FE260 built later than April 2014.
The maximum usable output frequency depends on the length of the cable between EK and FE
(see FE260 Operating Instructions - Chapter 3.3.1)
Application Manual
"Parameterize online" >
"PW.O3" or.
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"PW.O4"