Oerlikon 10926, Operating Instructions Manual

Page: 25 / 44

25 GAET02307_002_10 - 06/2008 - © Œrlikon Leybold Vacuum
Operation
When the pump has been switched off due to over heating, initiated by the
motor or its temperature detector, the pump must be cooled down to the
ambient temperature, and must only be switched on again manually after
having eliminated the cause.
In order to prevent the pump from running up unexpectedly after a mains
power failure, the pump must be integrated into the control sytem in such a
way that the pump can only be started by a manually operated switch. This
applies equally to emergency cut-off switches.
In case of switching processes in connection with a pump which has warmed
up under operatin
g condit i ons, the pump must then not be directly switched
on again.
4.3 Ultimate Pump Pressure
If the system cannot produce the pressures specified in the technical date,
measure the ultimate pressure directly at the pump’s intake port after
disconnecting the pump from the system.
The ultimate pressure of non-condensable gases (partial pressure of air) can
only be measured with a compression vacuum gauge or a partial pressure
gauge. Precise measurements can only be obtained with calibrated
instruments.
Upon initial start-up, after prolonged idle periods or after an oil change, it
takes a while until the pump reaches the specified ultimate pressure. The
pump has to attain its operating temperature, and the pump oil has to be
degassed. We recommend operating the pump initially with the gas ballast
valve open.
The ultimate pressure depends on the pump temperature and the pump
oil used. The best ultimate pressures can be obtained at a low pump
temperature and by using the recommended oil types.
4.4 Installing the Optional Gas Ballast Valve
The Sogevac
®
pump SV200-300 are supplied on request either with or
without a gas ballast valve. The valve can also be retrofitted (see § 4.1 for
choose of gas ballast).
Remove the fastening screws at the top of the pump cyclinder cover (7/51a-
52a), loosen the pump foot at the bottom of the cover (7/94) and take off the
cover.
Drain the oil (see 5.4.C).
Remove the screw (6/13) with gasket.
Install the chosen gas ballast valve (6/14) with its banjo bolt and gasket.
Reinstall the cover and fill in oil.
Caution