Martin Christ Alpha 2-4 LDplus - Manual (Page 56)

56 Error Correction Operating Manual Freeze Dryer ALPHA 1-4 LDplus / ALPHA 2-4 LDplus
Vacuum sensor defective
This error message is displayed in case the unit control system reads in an
invalid value supplied by the vacuum sensor.
Check the connecting cable and the connections to the vacuum sensor,
perform an atmospheric adjustment of the sensor or replace the vacuum
sensor if necessary.
Causes:
Vacuum sensor not connected.
Heating spiral of vacuum sensor broken.
Overpressure refrigerator 1
Overpressure in refrigeration unit KM1, released via the pressure switch.
Please check the ambient temperature, ensure sufficient air circulation of
the heat exchanger of the refrigeration system and check the load of the
unit.
Overpressure refrigerator 2
Overpressure in refrigeration unit KM2, released via the pressure switch.
Please check the ambient temperature, ensure sufficient air circulation of
the heat exchanger of the refrigeration system and check the load of the
unit.
Excess temperature “ice condenser”
This error occurs in case the temperature of the ice condenser exceeds
+65°C. All active aggregates are switched off simultaneously, i.e. the
system is automatically switched to standby mode. The error message can
occur when the temperature of the ice condenser exceeds +65°C when
defrosting the system. The refrigerating unit is switched off in order to
prevent it from being operated or started at too high temperatures. The
system cannot be restarted until the ice condenser temperature is lower
than +65°C.
Ice condenser temperature -20°C
In the case of insufficient ice condenser cooling, the ice condenser
temperature can increase to -20°C during the drying process. In order to
avoid damage to the vacuum pump caused by the withdrawal of
condensable gases, the pressure control valve will close automatically
when reaching this temperature, and an error message is displayed. Please
observe the function of the refrigeration system and contact the service
department, if necessary.
Temperature sensor “ice condenser” defective
This error occurs in case the temperature sensor is not connected properly
or in case it is defective. Please contact our service department.
Temperature sensor “defrosting heater” defective
This error occurs in case the temperature sensor is not connected properly
or in case it is defective. Please contact our service department.
Mains failure
The system detects a mains failure when the power supply is interrupted
under operating conditions (run mode). Once power supply is re-
established, the process will be continued. Process times will be reset to
zero. Set values for control purposes remain unaffected.
Factory settings loaded
All settings are reset to the delivery status of the unit. The factory settings
are loaded in case the corresponding command is executed in the service
menu or in case of an error in the parameter memory.
IO communication error (0x20)
Error in the IO module LDplus EA
Please contact our service department.