Installation
33
GA03108_002_C1 - 04/2018 - © Leybold
3.4 Electrical Connection
Notice safety information 0.2.
Especially when operating the pump using a frequency converter you must
ensure by means of a separate mains connection for the fan’s motor that is
connected to the right supply voltage and frequency. Otherwise the fan will
be damaged.
Always provide an uninterrupted connection for the protective ground con-
ductor
connecting it in a professional manner. Never leave the protec-
tive ground conductor for the pump unconnected.
Do not link control circuits to the power circuit of the motor. Observe the
wiring diagrams.
When connecting the motor you must also connect the thermal switch of
the pump motor (ensure protection in case of indirect contact, see Section
0.2.11) and the fan motor (for recommendations, see Fig. 3.6).
Never allow the pump to run in the wrong direction or with open flanges for
a longer period of time.
Connect the pump to the correct mains voltage through the terminals provi-
ded in the junction box (see Fig. 3.6).
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 (3.1/7) on the motor flange shows the correct direction of rotation
for the impeller connected to the motor shaft. 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 pressure must drop. If the pressure increases or remains constant, the
RUVAC is turning in the wrong direction.
Then rewire as described above.
The built-in fan is driven by a separate single-phase motor and may thus not
be used to determine the direction of rotation of the pump.
WARNING
NOTICE
CAUTION
