8.2
Over Pressure Management
A pressure transmitter monitors the feedback pressure from the CultiBag RM 600L.
In case of overpressure above +45 mbar ± 5 mbar for more than 3 minutes, the
metering valve will close until pressure drops less than +45 mbar ± 5 mbar. Thereby
providing additional culture safety and bag seal integrity.
8.3
List of Alarm Messages
The DCU control system BIOSTAT
®
RM Control Tower provides standard features
for alarm monitoring for process values and digital inputs.
Those standard features are described in the DCU operators manual.
This chapter describes only additional functions relating to alarms.
Process Value Alarms
The process values will be monitored for high and low limits.
The alarm indication will be performed with standardized text, e.g. "Process Value
TEMP high alarm".
The operator can change the alarm limits and can enable or disable each alarm via
the touch panel, given appropriate security access.
Please see also associated manuals for Control Tower.
System Power Failure
In case of power failure, the control tower keeps all controller states and setpoints
within the FAIL TIME saved. The FAIL TIME alarm can be triggered via following
operation:
Set the FAIL TIME [FTIME]. Disconnect the mains supply.
– If power supply comes back within the fail time, the system will reboot and all
controllers will be still in the modes established before the reset, Alarm message
“Power failure” will appear.
– If the power supply comes back after the fail time, the system will reboot and all
controllers will be in “OFF” Mode, Alarm message “Power failure, Fermentation
Stopped” will appear.
– In both cases the alarm message “System Power failure” will appear.
The default setting for the fail time is 2:00 hours
Motor Safety Stop Alarm
Alarm event from Rocker which is connected via a serial interface. The operator
cannot disable alarm, system restart is necessary.
Overpressure ALarm
See Chapter 8.3.
The operator can only disable this alarm, if the pressure returns to a normal operating
pressure situation.
Supplement
31