Varian DS102 1Ph, Инструкция пользователя

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TECHNICAL INFORMATION
TROUBLESHOOTING AND CORRECTIVE ACTION
NOTE
If the pump breaks down or does not work well, first check thoroughly that all the standards rules listed in the
sections relevant installation and operation are currently observed.
If you cannot get sufficiently low pressure, the problem may lie with the system connected to the pump, i.e.
the vacuum chamber and inlet line.
Even when the design sizes are correct, the problems listed below are still fairly frequent:
a) faulty seals: check that the seals are fitted, are in good working order
and are clean; check all
joints, taps, sight glasses, weld joints, etc.
b) unsuitable materials: avoid the use of rubber, plastic or even metal parts that are porous or permeable.
c) volatile substances: as far as possible, eliminate humidity, grease, dirt, rust, solvents (even small traces).
SYMPTOM PROBABLE CAUSE SUGGESTED REMEDY CARD
REF.
1 The pump does not start (or
stops immediately). A) The motor-pump coupling is
defective. Check state of the elastic joint and replace
the parts as needed. 105
B) Viscosity of the oil has in-
creased. Examine the oil and change if necessary
(find out why it has deteriorated). 102
C) Excessive friction inside
pump. Test the resistance to rotation, by turning
the joint by hand. If the rotors are blocked,
disassemble the pump body and check
state of the parts inside. 110
D) Electrical protections not set. Adjust the protections.
E) Oil too viscous because of
low room temperature. Heat the oil up to a temperature of 20 °C
or use an oil recommended for low tem-
peratures. 102
2 The pump stops (stalls). A) Seizure of some internal
parts. Proceed as at 1-C.
B) Oil very dirty. Proceed as at 1-B.
3 The pump overheats. A) Too much friction inside. Proceed as at 1-C.
B) Oil ducts clogged inside. Try changing the oil, otherwise disassem-
ble the pump and clean it well. 102
110
4 Too much oil drained off by the
exhaust. A) Gas Ballast device broken
(always open). Check the device to ensure the gas ballast
is properly adjusted. 110
B) Heavy duty work (high suc-
tion pressures or very frequent
cycles). Check condition of the oil trap filter.
C) Leak in system. Check the system (see “Note”).
5 The pump is loosing oil. A) Gaskets defective. Identify the areas where seeping occurs
and check the associated gaskets. Refer to the
card related
to involved
item
B) Oil level window broken Replace the oil level window.
57 87-900-943-01(E)