System Behaviour At The Start - Sartorius Stedim Biotech CERTOMAT CTplus Mode D'emploi Original

3.2.2 System behaviour at the start

After switching on the control unit and program start
as well as following the return of the power after a
power failure the measuring and regulating system is
in a defined basic state:
- The system configuration is loaded as it was preset
ex works or implemented later.
- User-defined parameters of a previous process can
be stored and called up again:
- Set points
- Calibration parameters
- Programming (batches)
- All controllers are switched off ("off").
- Timer sequences (e.g. the order of events of a stored
program) are stopped ("off").
- A fault message appears of the water pan does not
have enough water
In the case of downtimes, the switch-on behaviour
depends on the outputs and system functions that
have a direct effect on the connected terminal
(controller, timer, etc.) and on the type and duration
of the downtime. The following types of downtime are
differentiated:
- Switching on and off at the "Mains" main switch on
the control unit.
- Downtimes through failure of the power supply from
the laboratory connection (power failure).
A maximum duration or "Failtime" can be set for
power outages in the "System Parameters" submenu of
the main "Settings" function.
Fig. 12: "System Parameters" submenu,
For a description, see chap. 8 "Settings"
18
When the voltage returns after a power failure that is
shorter than "Failtime", the system continues to work
as it was:
- The system shows the "Power Failure" error message
with the time of the failure.
- Controllers continue to work with the selected set
point.
- Timers and set point profiles continue to be worked
through.
If the mains power failure is longer than the selected
"Failtime", the DCU system behaves as if the user had
switched the device off normally, i.e. it takes the
defined basic state.
After the next restart the alarm message "Power
Failure, Fermentation Stopped" (
the Appendix) then appears with details of the date
and time at which the mains failure occurred.
alarm messages in