Pressure transducers control of a VFD
I'm working on a project that I have one pressure transducers and two VFD and I have AC500 ECO PM564 ETH As main CPU .
And of course analog input , output modules .
So I need to know what is the difference between PD and PID function block and in my case I need to control the speed of the vfd according to the pressure value , so what should i use pd or pid control ?
I'm thinking to send the output speed to the vfd using modbus not analog output, is that ok or I will face some problems like losing modbus connection due to the noise of the vfd (5.5kw) , which I really faced but the vfd was 160 kw .
And the most important question did pm564 have an auto tuning function block or not ?
If not how to make the perfect tuning for pid I made a many search about tuning but it's not clear 100% .
So is there any documentation from abb for tuning a pid for a pressure application.
Thanks in advance.
Ps: the consultant or the owner refused to use the built in pid of the vfd and he need it from plc direct .
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