Fault Diagnosis DAC Professional
Fault 4: Pressure release
FAULT 4: Pressure release
Triggered by :
The monitoring time limit
Uet5 for the pressure release until reaching P11 has been exceeded.
Causes/ Remedy
Operating fault /Check by personnel:
•
Check that the cooling water outlet pipe is free of kinks and has a steady downward gradient
•
Check that the water outflow plumbing in the room is not blocked
Appliance fault / Repair by technical service personnel
►
Pressure release solenoid valve does not open
•
Electrical control system is faulty
-
in the "Diagnosis Program“, switch on output ACOUT 7:
the LED for this output lights up
-
Measure voltage at ACOUT 7 of control (approx.230V AC)
-
Measure voltage at output of the rectifier socket (approx. 200V DC)
-
Check coil of solenoid valve is conducting
•
Solenoid valve mechanically blocked (clogging)
Open valve casing
►
Pressure release filter clogged
Remove stopper. Check filter sieve for clogging, clean/exchange, insert new seal and screw tight.
►
Pressure sensor / Analog input AIN 3 measures too high
Even after pressure release, pressure signal still shows > P11. Follow-on faults would usually be "Fault 1
Vacuum system", " Fault 34: Sterilization TU"
Check the pressure displayed in "Diagnosis Program“/ "Analog inputs“ for plausibility, displayed value
must correspond to current atmospheric pressure (door open)
See also under "Fault 34 Sterilization TU“, "Pressure sensor, Analog input AIN 3 measures too high"
Exchange pressure sensor
If fault occurs again exchange CPU-board
09/21/2006
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Servicemanual DAC Professional
Summary of Contents for DAC PROFESSIONAL
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Page 56: ...Sirona DAC Professional Process 09 21 2006 54 61 Servicemanual DAC Professional...
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