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Adnan882
Junior
Joined: 21 Mar 2018
Posts: 15
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 Posted: 22/12/2018 20:33 Post subject: Gaz valve |
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Hello
The main gas valve no longer operates (blocked in the open position) knowing when there is no pressure (7 bar diffused by PARKER LUCIFER type preactuators, the control of the head valve) or no voltage (24v) of these preactuators the valve closes automatically .... this is the operating principle of the valve !!!! ??
The real case: global absence of voltage 24v: arrow: the valve in the open position (Even in case of power failure on the main cabinet) !!!
Is there a solution to this problem?
Thank you for your help |
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chandra
Junior
Joined: 22 Dec 2017
Posts: 7
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| Posted: 22/12/2018 22:44 Post subject: |
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Try to change the positioner..or preactuator as you said..
If this is blocked then the entire pressure keep your valve open..
If after change the positioner the problem remains ..that means there are mechanical problem with your valve.. |
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Adnan882
Junior
Joined: 21 Mar 2018
Posts: 15
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| Posted: 22/12/2018 22:57 Post subject: |
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| chandra wrote: | Try to change the positioner..or preactuator as you said..
If this is blocked then the entire pressure keep your valve open..
If after change the positioner the problem remains ..that means there are mechanical problem with your valve.. |
[image][/img][url][/url] |
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Adnan882
Junior
Joined: 21 Mar 2018
Posts: 15
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| Posted: 22/12/2018 23:15 Post subject: |
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| chandra wrote: | Try to change the positioner..or preactuator as you said..
If this is blocked then the entire pressure keep your valve open..
If after change the positioner the problem remains ..that means there are mechanical problem with your valve.. |
the 24v voltage of the positioner is fed from two digital outputs of the S7 400 controller
the two leds are always off |
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Adnan882
Junior
Joined: 21 Mar 2018
Posts: 15
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| Posted: 22/12/2018 23:23 Post subject: |
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| Adnan882 wrote: | | chandra wrote: | Try to change the positioner..or preactuator as you said..
If this is blocked then the entire pressure keep your valve open..
If after change the positioner the problem remains ..that means there are mechanical problem with your valve.. |
the 24v voltage of the positioner is fed from two digital outputs of the S7 400 controller
the two leds are always off |
[img]http://forum-automatisme.net/download/file.php?id=2794&mode=view
[/img] |
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SanjeetA
Junior
Joined: 06 Dec 2018
Posts: 3
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| Posted: 27/12/2018 17:11 Post subject: |
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You must have
1. (I7.4 OR M7.4) must be = TRUE ...both are FALSE so the result is FALSE
If one of the above are TRUE then the logic should work
((I7.4 OR M7.4) AND (M8.0) AND (NOT M8.1)) SET M10.4
M10.5 RESET M10.4
M10.4 AND (NOT M8.6) = Q5.0
= Q4.0
Check why I7.4 OR M7.4 are not at least one TRUE |
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Adnan882
Junior
Joined: 21 Mar 2018
Posts: 15
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| Posted: 28/12/2018 13:37 Post subject: |
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| SanjeetA wrote: |
You must have
1. (I7.4 OR M7.4) must be = TRUE ...both are FALSE so the result is FALSE
If one of the above are TRUE then the logic should work
((I7.4 OR M7.4) AND (M8.0) AND (NOT M8.1)) SET M10.4
M10.5 RESET M10.4
M10.4 AND (NOT M8.6) = Q5.0
= Q4.0
Check why I7.4 OR M7.4 are not at least one TRUE |
Hello
Thank you for your response
This picture is the visualisation of the programme OFF LINE.. when I visualise the programme ONLINE the result is M10.5 true; Q4.0 and Q5.0 false
I forced the parameter to have Q4.0 and Q5.0 true ; I taked it but i am not continued my work (cut off the pressure) risk of blocking the valve
(the valve must not be closed this time)
My problemis: Why M10.5 true when i visualise the programme on line??
THanks |
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Adnan882
Junior
Joined: 21 Mar 2018
Posts: 15
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| Posted: 28/12/2018 15:35 Post subject: |
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Hello
I7.4 : Push button opening
M7.4 : maintaining the push button
I7.5 : Push button closing
M7.5 : maintaining the push button
Thanks |
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mogz
Junior
Joined: 24 Mar 2012
Posts: 4
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| Posted: 29/12/2018 13:53 Post subject: |
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| Adnan882 wrote: | | SanjeetA wrote: |
You must have
1. (I7.4 OR M7.4) must be = TRUE ...both are FALSE so the result is FALSE
If one of the above are TRUE then the logic should work
((I7.4 OR M7.4) AND (M8.0) AND (NOT M8.1)) SET M10.4
M10.5 RESET M10.4
M10.4 AND (NOT M8.6) = Q5.0
= Q4.0
Check why I7.4 OR M7.4 are not at least one TRUE |
Hello
Thank you for your response
This picture is the visualisation of the programme OFF LINE.. when I visualise the programme ONLINE the result is M10.5 true; Q4.0 and Q5.0 false
I forced the parameter to have Q4.0 and Q5.0 true ; I taked it but i am not continued my work (cut off the pressure) risk of blocking the valve
(the valve must not be closed this time)
My problemis: Why M10.5 true when i visualise the programme on line??
THanks |
Then check the OR at the start.
One of these conditions is not correct.
M10.5 must be off for your program to work!! |
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