Sirona DAC PROFESSIONAL, Руководство по обслуживанию, Страница: 49 / 66

Fault-diagnosis DAC Professional
Fault 35: Sterilization TO
Fault diagnosis using the program print-out
FAULT 35 Sterilization TO
The control pressure reading on the print-
out at the time of the fault corresponds to
the rated values P6 – P10 The control pressure reading on the print-out
at the time of the fault is markedly higher than
the rated values P6 – P10
Signal to the steam generator Output
ACOUT1 is faulty / does not switch off
•
Check heat transfer semi-
conductor relay ACOUT1 to
cooling body
•
Exchange CPU-board
The temperature of temperature sensor
"Temp_Chambr_Dis1/2“ (Analog input
AIN2) corresponds to that of
temperature sensor
"Temp_chambr_elec“ (analog input
AIN1), but both temperatures are well
above the theoretical value needed for
saturated steam.
The temperature of temperature sensor
"Temp_Chambr_Dis1/2“ (analog input AIN2)
corresponds to the theoretical saturated
steam pressure, i.e. only the temperature
from the temperature sensor
"Temp_chambr_elec“ (analog input AIN1)
lies above the theoretical value needed for
saturated steam.
Pressure sensor signal faulty, too low
•
Pressure sensor faulty
•
Signal processing on CPU-board
faulty
Exchange pressure sensor/ CPU-
board
Temperature signal from analog input AIN 1
faulty
Switch temperature sensors AIN1 and AIN2
and restart program
•
Program runs without
disturbances,
(possibly "Fault 27") ?
•
Temperature on print-out too
high for saturated steam?
Exchange temperature sensor
now on AIN2 (was previously on
AIN 1)
•
Fault 35 again?
•
Does temperature on print-out
correspond with pressure to
generate saturated steam?
Signal processing on CPU-
board faulty,
Exchange CPU-board
09/21/2006 47/61 Servicemanual DAC Professional