Instruction manual for CoolSafe
01012016QA01
Item No. 700637
CopyRight © 2016
Page
22
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7
Error situations, status and error codes
7.1
Power failure
If the freeze dryer is running in manual or auto mode during a short period of power failure
– less
than 10 minutes, the freeze dryer will start up in the same mode and continue the ongoing process,
using the same parameters, in manual mode, and continue running the active programme if in auto
mode.
If the freeze dryer is running in manual or auto mode during a longer period of power failure
– longer
than 10 minutes, the freeze dryer will start up in the same mode and continue the ongoing process,
using the same parameters, in manual mode, and continue running the active programme if in auto
mode. If the pressure has increased, the freeze dryer will enter Cool only mode until the pressure
is below the alarm point, and then continue with the active programme.
7.2
Compressor start-up
These CoolSafe models are operated using two cooling stages each operated by a separate
compressor.
The system is set up to start the two stages with a time delay of 6 minutes. At start up stage 1 is
running for 6 minutes before stage 2 is started up. This is to ensure that pressure in the stage 2
system is keep within the allowable pressure limits.
In case the ice condenser temperature is below -70 °C (for instance after a short power failure) the
time delay is set to 10 seconds.
7.3
Status codes
A number of different codes gives information on the current status of the freeze dryer:
Displayed code
Description
OK
The ice condenser temperature is at -85 °C. The ice condenser is ready for the freeze drying process.
The freeze dryer will be in Await-state until this temperature is reached for the first time after power up.
Ice condenser ready.
Await
Will be shown while the ice condenser is cooling down. Change to OK-state when the ice condenser
reaches -85 °C the first time.
Ice condenser not ready.
Await
If the temperature in the ice condenser increase to over -75 °C, during the freeze drying process, the
Await-state is invoked until the ice condenser reaches -75 °C again, where OK-state is returned.
Ice
condenser overloaded.
Alarm
If the temperature in the ice condenser increase to over -65 °C, during the freeze drying process, the
cooling system is overloaded and the Alarm-state is invoked until the ice condenser reaches -65 °C again,
where Await-state is returned.
Status
