Fault diagnosis for DAC Professional
Fault 1: Vacuum system
Seite 5 von 5
Rev.-Nr.:98/0
Code01.doc
Fault 1: Vacuum system
Fault class: leakages
Leaks in the solenoid valves
►
The solenoid valve for the venting (VB) will not close, or it leaks
•
Check the coil, the rectifier plug, and the control at output 8
•
Solenoid valve dirty. Check the plunger / is the seating tight?
Test under sub-atmospheric conditions (Vacuum Test program)
Remove the sterile filter. Cover the opening of the sterile-filter fitting
with the palm of your hand. Then observe the pressure reading.
►
The solenoid valve for pressure release 1 + 2 (VDA1, VDA2) has a leak
•
Solenoid valve dirty. Check the plunger / is the seating tight?
Test under sub-atmospheric conditions (Vacuum Test program)
Observe the water column in the hose between the solenoid valve “Pressure release” and the sterile filter.
If there is a leak, water will be pulled in the direction of the solenoid valve.
Loosen the hose on the T-fitting for the cooling-water drain, close with finger, observe the pressure reading.
►
The solenoid valve for the vacuum 1 + 2 (VV1 + VV2) has a leak (Vacuum Test program)
•
Solenoid valve dirty. Check the plunger / is the seating tight?
Test under sub-atmospheric conditions (Vacuum Test program):
Observe the water column in the hose between the intake fitting for the chamber and the solenoid valve for the
vacuum. If there is a leak, water will be pulled in the direction of the solenoid valve.
►
The solenoid valve for the feed pump (VQ) has a leak
•
Solenoid valve dirty. Check the plunger / is the seating tight?
Test under sub-atmospheric conditions (Vacuum Test program):
Observe the water column in the intake hose leading to the input
of feed water between the conductivity-sensor and the intake fittings
of the pump, and on the pressure side of the pump. If there is a leak,
water will be pulled in the direction of the solenoid valve.
Leaks at the threaded connections and adhesive bonding
Test under sub-atmospheric conditions: start the “Leak search” procedure in the Diagnosis Program (0.3 bar, for
8 min). Or, feed compressed air into the autoclave through the vent-filter fittings (in Diagnosis program, close
output 8, “MV vent”). Brush a soapy solution on the points shown below and check to see if there are any air
bubbles.
Plug of the pressure-release
filter
Adhesive bond for the T-fitting in
the pressure-release filter
Cutting-ring threaded
connection for steam
generator / chamber
Swivelled threaded
connection for the
steam generator
Adhesive-bonded threaded hose
connections at the chamber
Cover seal for
steam generator
Threaded connections
for temperature sensor
09/21/2006
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Servicemanual DAC Professional
Summary of Contents for DAC PROFESSIONAL
Page 1: ...b a PROFESSIONAL p j...
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...
Page 64: ......
