Hi guys,
I'm having a problem with one of my pump on my system which is working with a PID in my SLC5/03.
A brief explanation of my process
The liquid from a tank need to be pumped with this pump controlled with a PID
and should maintain the right pressure asked at the output of this pump.
For exemple if i ask on the HMI 5 PSI.. this pump should start and reach 5PSI and then modulate around it.
In Manual Mode, i have no problem to start this pump and reach all the speed that i need from 0-100%
The Speed feedback on my HMI seem to work properly with the real speed of my motor and Hz on my drive.
I tested 0%, 10%, 20% and 30% in manual
Im also prety sure the Pressure feedback is also good on my HMI
The problem i have, when i turn my pump in automatic mode, itsimply can't start, the speed feedback stay at 0% and even when i do a start in manual and reach my PSI and switch in automatic the speed feedback drop from 20% to 0% and my PSI drop to 0...
It just like that my PID doesnt really take care of my Process Value or do not modulate properly.
I also tried with a higher GAIN setting like 5.0 or 15.0 and it doesnt do anything better, rather than droppingto 0% if it's set too high it will ignore my PV and simply overshoot my PSI and keep rising it.
i posted also my PID and all SCP from my PLC
I can also confirm that there is 30 word between each PID...
N21:23 Actual pump
N21:53 Other Pump 1
N21:83 Other Pump 2
The pressure transmitter is 0-250PSI working in 4-20ma
http://www.gefran.com/pt/download/4175/attachment/en
And my drive is a Siemens Micromaster 440
6SE6440-2UE24-0CA1
If you guys have any suggestion or idea please let's me know
Thank you !
I'm having a problem with one of my pump on my system which is working with a PID in my SLC5/03.
A brief explanation of my process
The liquid from a tank need to be pumped with this pump controlled with a PID
and should maintain the right pressure asked at the output of this pump.
For exemple if i ask on the HMI 5 PSI.. this pump should start and reach 5PSI and then modulate around it.
In Manual Mode, i have no problem to start this pump and reach all the speed that i need from 0-100%
The Speed feedback on my HMI seem to work properly with the real speed of my motor and Hz on my drive.
I tested 0%, 10%, 20% and 30% in manual
Im also prety sure the Pressure feedback is also good on my HMI
The problem i have, when i turn my pump in automatic mode, itsimply can't start, the speed feedback stay at 0% and even when i do a start in manual and reach my PSI and switch in automatic the speed feedback drop from 20% to 0% and my PSI drop to 0...
It just like that my PID doesnt really take care of my Process Value or do not modulate properly.
I also tried with a higher GAIN setting like 5.0 or 15.0 and it doesnt do anything better, rather than droppingto 0% if it's set too high it will ignore my PV and simply overshoot my PSI and keep rising it.
i posted also my PID and all SCP from my PLC
I can also confirm that there is 30 word between each PID...
N21:23 Actual pump
N21:53 Other Pump 1
N21:83 Other Pump 2
The pressure transmitter is 0-250PSI working in 4-20ma
http://www.gefran.com/pt/download/4175/attachment/en
And my drive is a Siemens Micromaster 440
6SE6440-2UE24-0CA1
If you guys have any suggestion or idea please let's me know
Thank you !