Fault diagnosis for DAC Professional
Fault 1: Vacuum system
Fault 1: Vacuum system
Æ
Fault class: Fault in control system or function of the pump
You can check the input voltage for the vacuum pump, as well as the function of the pump, as follows:
Æ
Fault class: the vacuum performance of the pump system is too weak
►
The vacuum solenoid valves 1 + 2 do not open (VV1, VV2)
•
The solenoid valve, or coil, or rectifier plugs are defective.
•
The activation for the solenoid valve (output 6) is defective.
Switch on output 6 in the Diagnosis program.
Check the electric control system and the switching behavior of the solenoid valve.
►
The flow resistance in the intake line is too high
•
Filter in the intake fitting on the sterilization
chamber is clogged up
►
The pressure-sensor signal is defective, or the
processing of this signal is not correct
•
The level of the pressure-sensor signal, or the signal processing,
is too high. See the section “Sensor Fault Group”.
►
The suction of the vacuum pump is too weak
Check the vacuum performance of the membrane as follows:
1. Check to see if there are leaks.
2. Make sure that the chamber to be evacuated is empty and dry.
3. If there are no leaks, and if the chamber is empty and dry,
check the performance of the pump. It must be at least
800 mbar in 80 s, or 900 mbar in 180 s.
4. If there are no leaks, and if the chamber is empty and dry, and if the performance of the pump does not meet
the above level (800 mbar in 80 s, or 900 mbar in 180 s), then exchange the pump.
Yes
Make sure that the intake side is vented, since the pump will not start against a vacuum. In the Diagnosis
program, switch on the solenoid valves for vacuum 1 + 2 (VV1 + VV2) by switching on the power output
ACOUT 6 (the valves are open when the current is applied).
Yes
Yes
No
In the Diagnosis Program, switch on the pump
(PV) by switching the power output ACOUT 3.
Does the pump now run?
Check Fuse F1. Is it OK?
Test the power output
EP2-2 on the circuit board
with a meter. Output OK?
No
Exchange
fuse F1.
Exchange the
circuit board.
No
The pump is defective.
Exchange the pump.
Proceed to the next step in the higher-level
fault-analysis plan.
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...
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