Fault-diagnosis DAC Professional
Fault 38: Sterilization TD
FAULT 38: Sterilisation TD
Triggered by:
The maximum permissible difference D6 between the temperature value to generate saturated steam calculated on
the basis of the measured pressure and the value measured by the temperature sensor "Temp_chambr_elec“ at
AIN1 during the period T1-T5 was exceeded.
Cause / Remedy
Operating fault / Checks by personnel:
Overheating, in particular in the case of textile loads soiled with chemicals
Appliance fault / Repair by technical service
►
No saturated steam pressure / Leaking
As a result of too much residual air in the autoclave chamber, the temperature is not high enough to allow
the generation of saturated steam.
Check using the print-out records:
Control pressure in record corresponds to control pressures P 6 – P10
Reading in record from temperature sensor "Temp_Chambr_Dis1/2" at Analog input AIN2 is also too low
(corresponds to the temperature of temperature sensor "Temp_chambr_elec" at analog input AIN1 (see
last line of record print-out.)
Carry out a vacuum test
►
Temperature sensor "Temp_Chambr_elec"/ Analog input AIN1 fehlerhaft
Check using the record print-out:
Print-out reading for control pressure corresponds to control pressures P 6 – P10
Print-out reading for temperature sensor "Temp_Chambr_Dis1/2“ at analog input corresponds with the
pressure required for saturated steam.
In order to determine whether the fault lies in the temperature sensor or the signal processing on the CPU-
board, proceed as follows:
Change temperature sensors on AIN1 and AIN2 and start the program again
►
Pressure sensor / Analog input AIN 3 measures incorrectly
If the checks show there is no leak (Vacuum test), check through the following on the program print-out::
Pressure reading on print-out corresponds to the control pressures P 6 – P10
Print-out readings from temperature sensor "Temp_Chambr_elec“ (AIN1) and from temperature sensor
"Temp_Chambr_Dis1/2“ (AIN2) correspond to one another, but both are too low or too high to produce
saturated stream
•
Exchange pressure sensor
•
If there is still a fault, exchange the CPU board
•
Program
runs
without
disturbance, (or with "Fault 27“ )
•
Temperature on print-out
deviates from that needed to
produce saturated steam?
Exchange temperature sensor
now on AIN2 (was on AIN 1)
•
Fault 38 again
•
Temperature reading on print-
out corresponds with the
pressure to produce saturated
steam
Signal processing on CPU-board
faulty,
Exchange CPU-board
09/21/2006
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Servicemanual DAC Professional
Summary of Contents for DAC PROFESSIONAL
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Page 7: ...Figure 4 Back view 09 21 2006 5 61 Servicemanual DAC Professional...
Page 56: ...Sirona DAC Professional Process 09 21 2006 54 61 Servicemanual DAC Professional...
Page 60: ...Valve diagram 09 21 2006 58 61 Servicemanual DAC Professional...
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