Sartorius DCU 3 - Page 54

Operators Handbook DCU3 – System
6., Main function „Control Loops“
BAEDCU3 - Rev. 4.6 - 0504 6 - 20
6.13.2 Operating Display Servo Controller (Gasflow Ratio Controller)
 For a description of the tags, the physical units or entries, the displayed value or function
and of the required inputs see the table in section 6.3, Controller Operation in General.
Above this the display has the following entries and functions for these inputs:
Tag Entry Displayed value or function, required input
PV GAS1 slpm Flowrate Gas1, e.g. O
2
PV GAS2 slpm Flowrate Gas2, e.g. air
RATIO % Input of ratio of Gas 1 to total flowrate;
− external setpoint in mode „cascade“;
− master controller (Contr.) has access to RATIO
TOTAL slpm Input of total flowrate of Gas1 and Gas2 :
− external setpoint in mode „cascade“,
− master controller (Contr.) has access to TOTAL
MODE Input of controller mode
off
− controller off, both outputs 0
auto
− manually enter TOTAL and RATIO
manual
− inactive
cascade
− servo controller in pO
2
gasflow control circuit,
access to RATIO and TOTAL
profile
− setpoint for TOTAL or RATIO (depending on CONTROL setting)
CONTROL Enter access of master controller or of profile
TOTAL
− total flowrate controlled
RATIO
− ratio controlled
In mode „auto“ or „casc.“ inputs are impossible.