14
GA02329_002_03 - 01/2010 - © Oerlikon Leybold Vacuum
4.2
Working in cycles in / out
We recommend strongly to limit starting of the pump to 5 or 6 per hour.
If the process need it, we recommend utilization of a pneumatic or
electromagnetic valve and to let the pump run continously.
4.3
Switching off / Shutdown
The intake port of the Sogevac
®
pumps contains an anti-suckback valve
which closes the intake port when the pump is switched off, thus maintaining
the vacuum in the connected apparatus and preventing oil from being
sucked back into the apparatus. The valve’s functioning is not impaired by
gas ballast operation.
If the pump has to be shutdown, drain the oil flush out the pump with
fresh oil and fill in the required amount of clean oil (see § 5.4). Close the
connection ports. Special preservation or flushing oils do not need to be
used.
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 operation conditons, the pump must then not be directly switched
on again.
Operation
Caution
