Hello Everyone
I need to solve the following tasks:
1. Make totalizer using Analog Input signal.
I have MD+ series controller with AI card with Flow Transmitters wired on it. Transmitter measures current flow rate. Engineering units of FT is [kg/hr]
Which block in Control Strategie is right to use to make Totalizer to count
- summary(Total) flow rate of last 2 hours in [kg]
- summary flow rate of a 24 hours (last day, use 00:00 PST as base point) [tonnes/day]
2. Two flow runs , with an oil in first pipe and depressant in second pipe, with Flow Transmitters, which measuring current flow rate, installed on each pipe as well. Motor operated valve is used to inject depressant into oil pipe. By technology it is needed to inject 200 gramms of Depressant per each tonne of oil. How will PID block for MOV be set? What I think is to add two PID`s and make cascade mode of operating of:
PID1, with following parameters:
PV - FT installed on depressator pipe (4-20mA)
SP - ?
OUT - will be connected to SP of PID2
PID2, with following parameters
PV - FT installed on oil pipe (4-20mA)
OUT - MOV
Kindly advice if have related experience. Thank you in advance!
Daniyar Mamenov
Design & Application Engineer
Projects - ME&CIS
INTECH Process Automation - Kazakhstan Office