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English Support - Hardware => MFD-Titan® => Thema gestartet von: K.VEDARAMAN am Juni 10, 2008, 18:25:17 Nachmittag
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Dear Friends,
I need some help in implementing the following in MFD Titan easy control relay. I am measuring the water flow rate through a pipe line using Frequency Counter function block. I want to totalise the volume of water. Also I want to do batching and would like to have auto and manual reset for batch volume and hold function to stop batching temporarily.
Can somebody help?
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Hi
Could you explain "batching" and "batch volume"? Sorry, my technical englis skills are not on a high level.
Do you think it is necessary to use a frequency converter? Was is the Frequency rate? According the manual:
-The maximum counter frequency is 5 kHz.
-The minimum counter frequency is 4 Hz.
-Only square wave signals are permissible.
-The mark-to-space ratio is 1:1.
May be, a simple counter is also suitable and much easyer to handle.
Regards
Hermann
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Hi
Could you explain "batching" and "batch volume"? Sorry, my technical englis skills are not on a high level.
Do you think it is necessary to use a frequency converter? Was is the Frequency rate? According the manual:
-The maximum counter frequency is 5 kHz.
-The minimum counter frequency is 4 Hz.
-Only square wave signals are permissible.
-The mark-to-space ratio is 1:1.
May be, a simple counter is also suitable and much easyer to handle.
Regards
Hermann
Hi Hermann,
Thanks for your reply. The flow sensor generates square wave signal with 1:1 mark to space ratio and works fine with MFD Titan with Frequency function block enabled. The frequency of the incoimg signal is with in specifications. No problems on this. I want to do is to measure the frequency, convert the value in to flow rate ( example litres/minute or cu.m/hr and also totalise the volume of water that has passed through the pipe over a period of time. For exmaple I want to totalise volume of water passing through the pipe for 30 days. In batching I will reset the toatl volume based on a event or time. It is clear to you now?
Thanks KV
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Hi Hermann,
Thanks for your reply. The flow sensor generates square wave signal with 1:1 mark to space ratio and works fine with MFD Titan with Frequency function block enabled. The frequency of the incoimg signal is with in specifications. No problems on this. What I want to do is to measure the frequency, convert the value in to flow rate ( example litres/minute or cu.m/hr and also totalise the volume of water that has passed through the pipe over a period of time. For example I want to totalise volume of water passing through the pipe for 30 days. In batching I will reset the toatl volume based on a event or time. Is it clear to you now?
Thanks
KV
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Good morning,
possibly following could solve your problem:
use a unit for constant cycle time (i.e. 100ms cycle time) and a fast counter.
The counter adds all pulses to the total volume. Store the counter value in a shift register which shifts every cycle (means, that every 200ms a value of the counter is stored). Sub the actual value from one of the outputs of the shift register (i.e. if you use the 5th output, then you have exactly 1 sec between the two values).
With arithmetic units you can convert the result to an applicable value (i.e. Ltr./min or gal./hr.).
For each batch you store the counter value at beginning and at end of the batch in a marker (the difference is the total volume of the batch or the difference of the start-value and the counter value is the actual volume before ending the batch).
Sorry for the bad english, but I hope you could understand the principle of my solution.
If not: Don't hesitate to ask specific questions.
Kindest regards
boppel
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Thank you my friends,
I shall try your sugesstions and revert.
Regards
K.V