Operators Handbook DCU3 – System
6., Main function „Control Loops“
BAEDCU3 - Rev. 4.6 - 0504 6 - 21
6.13.3 Parametrization Display Servo Controller (Gasflow ratio controller)
Tag Entry Displayed value or function, required input
TOTAL MIN % Enter minimum output limit for total flow
TOTAL MAX % Enter maximum output limit for total flow
RATIO MIN % Enter minimum output limit for ratio of gas 1
RATIO MAX % Enter maximum output limit for ratio of gas 1
6.13.4 Operation
For routine adjustment of the pO
2
gasflow controller the operation mode (CONTR: to-
tal/ratio) and the setpoint, which is not triggered by the master controller, must be defined
only once. Afterwards only setpoint and controller mode of the master controller (pO2GF)
need be set.
6.13.5 Special Notes
In the operating modes „auto“ and „profile“ of the master controller the servo controller is
automatically set into „cascade“ - mode. If the master controller is in the operating mode
„off“, the servo controller is automatically set into the mode „off“.
In the mode „cascade“ either the total flowrate (TOTAL) or the ratio of gas 1 (RATIO) is con-
trolled by the master controller; the other variable must be manually adjusted.
Timer profiles for the servo controller can either control TOTAL or RATIO; this can be ad-
justed in CONTR of the servo controller.
You can switch over the access of the master controller from TOTAL to RATIO (and vice
versa) only when the servo controller is switched off (Mode „off“).
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