Christ ALPHA 2-4 LDplus - Page 57

Freeze-dryer Alpha 1-4 LDplus
Freeze-dryer Alpha 2-4 LDplus
7 Malfunctions and error correction
Version 11/2006, Rev. 2.2 of 17/10/2016 • sb
57 / 102
Translation of the original operating manual
Error message
Possible cause
Remedy
Overpressure of refrigeration unit 2
• The overpressure switch of the
refrigeration unit has tripped.
• Let the freeze-dryer cool down.
• Ensure sufficient air circulation
(see chapter 7.1.3 - "Insufficient
ice condenser temperature").
Ice condenser overtemperature
Ice condenser temperature > +65°C. All
of the units will be switched off and the
freeze-dryer will be automatically set to
standby.
• The defrosting process has
been performed with the cover
closed.
• Remove the cover and let the
freeze-dryer cool down.
Ice condenser temperature > 20°C
The ice condenser temperature rises to
a non-permissible value during the
freeze-drying process. The pressure
control valve will close automatically in
order to prevent the vacuum pump from
being damaged.
• Insufficient cooling.
• Observe the behaviour of the
refrigeration system. If
necessary, inform the service
department (see chapter 7.3 -
"Service contact").
Defective ice condenser temperature
sensor
• The temperature sensor is not
connected or it is defective.
• Inform the service department
(see chapter 7.3 - "Service
contact").
Defective temperature sensor of the
defrosting heater
• The temperature sensor is not
connected or it is defective.
• Inform the service department
(see chapter 7.3 - "Service
contact").
Mains power failure (see chapter 7.1.1
- "Power failure")
• The power supply has been
interrupted.
• The mains power connector is
not connected.
• The fuses have tripped.
• The mains power switch has
been switched off.
• Check the mains fuse.
• Connect the mains power
connector firmly.
• Check the customer-provided
fuses.
• Switch the mains power switch
on.
Default settings loaded
All of the settings have been reset to the
delivery state of the freeze-dryer.
• Error in the parameter memory.
• Manual execution in the service
menu.
• No measure required.
IO communication error (0x20)
• Error in the LDplus IO module.
• Inform the service department
(see chapter 7.3 - "Service
contact").
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