KNF SC 920G Manual De Instrucciones página 81

Vacuum Pump System SC 920G
Vacuum pump system as a whole
Problem
Translation of original Operating Instructions, English, KNF 334631-334633 07/21
Cause
Leaks in venting valve.
Condensation in pump
head.
Gas outlet blocked on high-
performance condenser.
Worn diaphragms or valve
plates.
Replaced diaphragms and
valve plates.
Troubleshooting
Solution
 Temporarily close the ventilation
connection (Fig. 2/6, p. 12). If this
stops the leak, leaks are present in
the venting valve. In this case:
 Flush the venting valve:
1. Close the gas inlet (Fig. 2/7).
2. If necessary for safety reasons:
Connect inert gas to ventilation
connection. Observe the safety
instructions in chapter 3.
3. Run the vacuum pump system at
100% pump capacity in evacuation
mode.
4. Re-open the gas inlet.
 If problem persists, contact KNF
Service.
 Dry system with fresh air or, if
necessary for safety reasons, with
an inert gas:
1. Using inert gas: Connect inert gas
source with gas inlet (Fig. 2/7, p. 12)
and start system up in evacuation
mode (100% capacity). Observe the
safety instructions in chapter 3.
2. Using air: Open gas line (Fig. 2/7, p.
12) to the surrounding environment
and start system up in evacuation
mode (100% capacity).
3. Close the gas inlet after 30 seconds,
and leave the vacuum pump system
running for 30 seconds under
vacuum.
4. Repeat this process 3–5 times.
 If this problem occurs frequently,
place the vacuum pump system at a
higher level than the vacuum
chamber.
Risk of bursting of high-performance
condenser!
 Eliminate blocking of gas outlet.
 Replace diaphragms and valve
plates (chapter 9.3).
 Check that the correct diaphragm
spacers are placed under the
diaphragms.
 If necessary, carefully tighten the
pump head fixing screws (Fig. 17/2,
p. 33) in diagonally opposite
sequence.
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