jamalshahid
Member
I have attached logic which i made for the operation which is described below. This is the detail of what i need. Please have a look and let me if i am on right page or not. Thanks
2 Motors, 2 VPDS
Motor (1) and VFD (1) will work as primary. Motor (2) and VFD (2) will work as a backup means if motor (1) and VFD (1) will stop working. Motor (2) and VFD (2) will wait for 10 seconds and start working after failure of motor (1) and VFD (1)
For inlet pressure we are using pressure transmitter PT1 (range is 0-0.75 psi)
For outlet pressure we are using pressure transmitter PT2 (range is 1-10 psi)
(** instrument PT1 and PT2 range is -30 HG-0-30 PSI)
Inlet pressure should always be greater than 0.25 psi and outlet pressure should always be between 3-7 psi. If outlet pressure is less than 7 psi motor will speed up but before speeding we have to see the inlet pressure also. Motor will only speed up if inlet pressure is also above 0.25 psi. If inlet pressure is less than 0.25 psi motor will not speed up and wait for inlet pressure to come above 0.25 psi.
If inlet pressure is less than 0.25 psi and outlet pressure is less than 3 psi. Alarm will come called low inlet pressure.
If outlet pressure is above 7 psi motor will slow down until pressure drops below 7 psi.
In short, if outlet pressure is less than 7 psi motor will speed up by keeping inlet pressure in mind and if outlet pressure is above 7 psi motor will slow down.
2 Motors, 2 VPDS
Motor (1) and VFD (1) will work as primary. Motor (2) and VFD (2) will work as a backup means if motor (1) and VFD (1) will stop working. Motor (2) and VFD (2) will wait for 10 seconds and start working after failure of motor (1) and VFD (1)
For inlet pressure we are using pressure transmitter PT1 (range is 0-0.75 psi)
For outlet pressure we are using pressure transmitter PT2 (range is 1-10 psi)
(** instrument PT1 and PT2 range is -30 HG-0-30 PSI)
Inlet pressure should always be greater than 0.25 psi and outlet pressure should always be between 3-7 psi. If outlet pressure is less than 7 psi motor will speed up but before speeding we have to see the inlet pressure also. Motor will only speed up if inlet pressure is also above 0.25 psi. If inlet pressure is less than 0.25 psi motor will not speed up and wait for inlet pressure to come above 0.25 psi.
If inlet pressure is less than 0.25 psi and outlet pressure is less than 3 psi. Alarm will come called low inlet pressure.
If outlet pressure is above 7 psi motor will slow down until pressure drops below 7 psi.
In short, if outlet pressure is less than 7 psi motor will speed up by keeping inlet pressure in mind and if outlet pressure is above 7 psi motor will slow down.