Frequency Output - GF PF220 V2 Betriebsanleitung

Operating Instructions
drops below 280 l/min in the reverse direction then set the Direction to Falling Activation Level to -300 l/min and Deactivation
Level to -280 l/min. Note the negative signs.
A useful configuration of the alarm mode could be to set two outputs to Alarm Mode using the same Flow Measurement Source.
One could be set to be an over-value alarm (no hysteresis) and one an under-value alarm (again, with no hysteresis). If the
corresponding outputs are wired in parallel, then the resulting alarm will activate when flow is above a certain threshold OR when
it is below a certain threshold.
Power Alarm
Signal Alarm
The Signal alarm ties an output to the loss or reacquisition of a signal. When signal is lost the screen on the flow will read "-----"
instead of a valid flow number. Signal is deemed to have been lost when the power and SNR ratio is out-of-bounds for longer than
the time set in the Signal Loss Time-out field of the Primary Flow screen. The default value is 3 seconds. When the signal is lost
it is deemed to have a value of zero, otherwise it has a value of 1. To generate an alarm when signal is lost set the Direction to
Falling and set the Activation Level and Deactivation Level to 0.5. These values are set automatically when Signal is selected as
the Measurement Source.
9.2.3

Frequency output

The output frequency is proportional to the flow rate or power within a specified frequency range of 0 – 200Hz. With the exception
of the Measurement Source being Signal, it only makes sense to measure derivative quantities such as Power and Flow. In these
cases, the instantaneous frequency is directly proportional to the instantaneous flow or power.
Both the lower and upper frequency as well as the values they represent can be set in the Freq Output screen. It is usual to set
the frequency range to the default of 0 and 200Hz. At 0Hz, the associated output switch is closed continuously. The lowest longest
waveform period is 60 second, hence the lowest non-zero frequency that can be generated is 1/60 = 0.01667 Hz. The precision of
the generated frequency averages ± 1%.
Generally, 0Hz represents zero flow or zero power, so the only selection that needs to be made is the maximum flow or power to
be accommodated at 200Hz.
1. Use the UP/DOWN arrow keys to select Direction. Select
Rising to trigger an alarm when a certain power is
exceeded or Falling to trigger an alarm when a certain
power is not achieved.
Use the UP/DOWN arrow keys to select Activation Level.
2.
Set the power limit for the alarm on this output.
3. Set a Deactivation Level (the value at which an alarm is
canceled).
4. If the direction is set to Rising, the alarm is triggered when
the power exceeds the Activation Level. The Deactivation
Level must be a value less than or equal to the Activation
Level.
5. If the direction is set to Falling, an alarm is triggered when
the power drops below the
Activation Level. The Deactivation Level must be a value
greater than or equal to the Activation Level.
6. Use the UP/DOWN arrow keys to select Save Setup and
Exit.
Outputs
49