Sartorius DCU 3, Operator'S Handbook Manual

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Operators Handbook DCU3 – System
6., Main function „Control Loops“
BAEDCU3 - Rev. 4.6 - 0504 6 - 15
6.10.1.3 Special Notes
When the pO
2
controller is in „auto“ or „profile“ mode, the selected servo controllers are
automatically switched to „cascade“ mode.
When the pO
2
controller is in „off“ mode, the selected servo controllers are switched auto-
matically to „off“.
Switching over from servo controller 1 to servo controller 2, then to servo controller 3 (and
vice versa) only occurs when the output limit concerned is out of its range for the delay time
set in „HTIME“. After this delay period the switch-over condition will be checked again and
the controllers then be switched over only if the condition is still true. The delay time for
switching over can be set in the parametrization display of the pO
2
-controller.
The setpoint limits of servo controllers must be set by the master controller (pO
2
-controller).
A reverse switch-over sequence of one or more servo controllers (addition pumps, etc.) can
be achieved via reverse setting of the setpoint output limits (MIN > MAX).
The working range of the pO
2
- master controller is allways defined by the MIN/MAX-limits of
the corresponding servo controller.