MFD TITAN PROGRAMMING HELP

[K.VEDARAMAN]

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?

[KressSwiss]

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

[K.VEDARAMAN]

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

[K.VEDARAMAN]

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

[boppel]

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

[K.VEDARAMAN]

Thank you my friends,

I shall try your sugesstions and revert.

Regards
K.V