One reason could be the resistor (8) having a short circuit. Normally its resistance has the value
of 200K.
One more possibility is a faulty capacitor. Check the capacitors, mainly the one on top (7) of the
oscillator circuit which is connecting the anode of the tube with the oscillator circuit. Check also
the grid capacitor (6) which is placed underneath the oscillator chassis. Try to find out whether
they are broken by applying a reasonable force on them to see whether they are still in one
piece.
Check also the other, bigger capacitors (9), (10) and (11) however if one of them was faulty,
most probably the fuses would blow.
3.3.2 Resistance furnace operation
See Chapter 2.4.2 “IResitance furnace operation”.
Pos: 3.8 /0025 Ü berschriften/ELTR A 1.1 Übersc hriften/11 Bad co mbustion ELTRA @ 6\mo d_13686086564 40_9.docx @ 40 248 @ 2 @ 1
3.4 Bad combustion
Pos: 3.9 /0010 ELTRA/0015 ser vice_instructions /CS-2000_ser vice/05Faults_C S-2000/05 20 Modul Bad com bustion @ 9\m od_14255394 43621_9.docx @ 74129 @ 33 @ 1
3.4.1 Induction furnace operation
In most cases the reasons for bad combustion are:
– Problems with the flow
– The Generator (oscillator) tube is not powerful enough anymore. Norma lly this does
not occur suddenly. It is rather a long process.
(Part number 77210)
– The contacts of the tube are bad.
Some more hints:
: bypass valves
The bypass valve V4 (28) is either falsely activated during combustion, or the plunger jams. In
this case, the oxygen flows through the bypass valve into the IR-cell and not through the
furnace. The furnace remains nonetheless under oxygen pressure.
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