Oerlikon RUVAC WA, Installation And Operating Instructions Manual

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Installation
42 GA03107_002_A4 - 09/2015 - © Oerlikon Leybold Vacuum
After connecting the motor and every time you alter the wiring, check the
direction of rotation.
Wear protective goggles for protection against particles which may be
forced out of the flange opening. Keep your hands away from the flange
opening.
An arrow on the motor flange shows the correct direction of rotation for the
impeller connected to the motor shaft (see fig. 3.1). To check rotation, switch
on the motor briefly and observe the direction of impeller rotation through the
pump’s intake and then immediately switch off again.
The impellers should move up from the center and drop down to the side.
If this is not the case, disconnect the pump from the mains and interchange
two mains phases.
Even if the pump has been already firmly connected to the piping, you may
determine the direction of rotation.
For this, evacuate the vacuum system down to a pressure below 20 mbar with
the aid of the backing pump. Then switch on the RUVAC briefly; now the pres-
sure must drop. If the pressure increases or remains constant, the RUVAC is
turning in the wrong direction.
Then rewire as described above.
Pressure switch
For ATEX applications process the signal with an intrinsically safe electric circuit
only.
The RUVAC can be automatically switched on and off via a contactor using a
pressure switch and the contact amplifier SV 110.
At Oerlikon Leybold Vacuum, the pressure switch PS 115 is set to a fixed
value. When ordering the pressure switch please state the required switch-on
pressure.
After removing a screw plug, the pressure switch together with an adapter
and a right-angle bend can be mounted on the bore (see fig. 3.1).
When doing so, ensure proper sealing and air-tight installation.
It is advisable to mount the switch vertically to reduce the entry of contami-
nants.
Temperature sensor
(see ATEX Section)
CAUTION