Sirona DAC PROFESSIONAL, Service Manual

Page: 47 / 66

Fault Diagnosis DAC Professional
Fault 34: Sterilization TU
Fault diagnosis using the program print-out
FAULT 34: Sterilization TU
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 lower than the rated
values P6 – P10
The overheating protection of the steam
generator switches off
•
The capillary tube level regulator DIN 2
does not switch / switches too late (water
shortage not recognised)
•
The capillary control "Overheating
protection" switches too soon.
Exchange steam generator
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
below 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 below the theoretical value needed for
saturated steam.
Leaking, no saturated
steam (do vacuum test)
Pressure sensor signal faulty, too
high
•
Pressure sensor faulty
•
Signal processing on CPU-
board faulty
Exchange pressure sensor /
CPU-board
Temperature signal from analog input
AIN 1 faulty
Change temperature sensors on AIN1
and AIN2 and restart program
•
Program runs without
disturbances,
(possibly "Fault 27") ?
•
Temperature on print-out too low
for saturated steam?
Exchange temperature
sensor now on AIN2 (was
previously on AIN 1)
•
Fault 34 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 45/61 Servicemanual DAC Professional