Martin Christ Alpha 1-2 LDplus - Manual (Page 54)

Freeze-dryer Alpha 1-2 LDplus
7 Malfunctions and error correction
54
Version 11/2006, Rev. 2.0 of 02/12/2014 • sb
Translation of the original operating manual
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7.2 Process and equipment messages
Error message Possible cause Remedy
Vacuum 6.11 mbar not reached
The value of 6.11 mbar is not reached
within 15 minutes with an open pressure
control valve. The pressure control valve
will be closed and the vacuum pump will
be switched off.
• The aeration and media drain
valves are soiled.
• The small flange connections
are not properly connected.
• A seal is soiled or damaged.
• The cover or drying chamber is
not properly attached.
• The ground-in stopper is not
inserted correctly or it is
missing.
• The vacuum pump is switched
off or defective.
• Clean the valve (see chapter
8.1.1.3 - "Aeration valve, media
drain valve") and replace it if
necessary.
• Loosen the connection. Place
the centring ring with the inner
sealing ring in a centred manner
between the flange connections
and connect it with the clamping
ring. Ensure that the centring
ring neither slips out of place nor
gets jammed.
• Clean the seal and replace it if
necessary.
• Check the cover and drying
chamber.
• Grease the ground-in stopper
evenly and over the entire
sealing surface with vacuum
grease and install it.
• Switch the vacuum pump on.
Refer to the separate instruction
manual of the vacuum pump.
Defective vacuum sensor
The control system registers an invalid
measurement value.
• The vacuum sensor is not
connected correctly.
• The calibration is faulty.
• The vacuum sensor is soiled
(e.g. due to water residues).
• The vacuum sensor is
defective.
• Check the vacuum sensor
connectors.
• 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 chapter 7.1.2.5 - "Vacuum
sensor".
Overpressure of refrigeration unit 1 • 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").
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.