Freeze-dryer Beta 1-8 LSCbasic
Freeze-dryer Beta 2-8 LSCbasic
7 Malfunctions and error correction
Version 03/2018, Rev. 1.5 of 09/03/2020
• sb-dc
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Translation of the original operating manual
Type of error
Possible reason
Correction
The displayed vacuum value is not
correct
•
Incorrect calibration
•
The vacuum sensor is soiled
(e.g. due to water residues)
•
The vacuum sensor is
defective.
•
Calibrate the vacuum sensor
(see the separate operating
instructions of the vacuum
sensor).
•
Clean the vacuum sensor.
•
Check the vacuum display with
the aid of a reference device (if
available).
•
see (see chapter 7.1.2.5 -
"Vacuum sensor")
The vacuum pump is not activated
•
See the separate operating
instructions of the vacuum
pump.
•
See the separate operating
instructions of the vacuum
pump.
Insufficient ice condenser or shelf
temperature
•
The overpressure switch of the
refrigeration unit has tripped.
•
The thermal circuit breaker has
tripped.
•
Let the unit cool down.
•
Ensure sufficient air circulation
(see chapter 7.1.3 - "Insufficient
ice condenser temperature")
The error message "Refrigeration
unit x.x overpressure" is displayed
during a freeze-drying process
•
Leakage on the low pressure
side (suction side) of the
refrigeration system leads to a
pressure increase
•
Acknowledge the message. If
the message is displayed
repeatedly, inform the service
department (see chapter 7.3 -
"Service contact")
NOTE
If it is impossible to eliminate the errors, contact the Christ service
department!
→
7.1.1
Power failure
The control system continues with the process after a power failure. The
preselected conditions remain saved even during a process run.
In the event of a power failure in the drying phase, the batch may become
unusable. Whether the batch can be saved or not depends on the drying
phase in which the product was when the power failure occurred.
• In the final drying phase, the product has reached a residual moisture
content of approx. 5%. Below this value, the product is generally not
damaged even if the power failure lasts for a longer period of time.
• If the product is in the main drying phase, we recommend aerating the
unit, removing the product, and storing it in a deep-freeze. The
defrosted condensate must be drained off prior to the next start.
