plcsoftvsd
Member
Hi,
The project is as under...
a)16 centrifugal pumps of which 4 pumps have Variable speed drives and will pump water into a common discharge manifold.
b)The objective is to keep constant water pressure 4.1 bar.
c)The VSd driven pumps to start first and when the demand is not met by these 4 pumps then the other pumps(with no VSD) will kick in till the pressure is achieved.
d)I have started writing a program using a Twido PLC with one analog input ( 4-20ma) from a Pressure transmitter (Discharge pressure) and one PID controlled analog output 0-10 vdc which will be parralled to all the four drives.
e) When all four VSD's are ON and still the analog output value is higher than 5 VDc then the other pumps will kick in.
f)Now the tricky part is to keep all the pumps to have same running hours.
I have attached a draft twido program ..appreciate any ideas/corrections.
Cheers.
The project is as under...
a)16 centrifugal pumps of which 4 pumps have Variable speed drives and will pump water into a common discharge manifold.
b)The objective is to keep constant water pressure 4.1 bar.
c)The VSd driven pumps to start first and when the demand is not met by these 4 pumps then the other pumps(with no VSD) will kick in till the pressure is achieved.
d)I have started writing a program using a Twido PLC with one analog input ( 4-20ma) from a Pressure transmitter (Discharge pressure) and one PID controlled analog output 0-10 vdc which will be parralled to all the four drives.
e) When all four VSD's are ON and still the analog output value is higher than 5 VDc then the other pumps will kick in.
f)Now the tricky part is to keep all the pumps to have same running hours.
I have attached a draft twido program ..appreciate any ideas/corrections.
Cheers.
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