High vacuum pumps, exhausters and blowers operating manual
16
DANGER
Lay the pump power cable in such a way that it cannot cause the risk of tripping or falling or can be
damaged.
Always install an electric protection system between the
pump and power supply; the pump’s absorption levels are
shown on the electric motor plate. The fuses do not protect the motor, but are only a protection against short-circuiting.
Select a suitable kind and size of fuses bearing in mind the peak current, especially in the case of direct start-up.
The protection with motor protection is essential against overloading risks, in the absence of a network phase,
excessive variation of the voltage or pump block. Adjust the motor protection on the plate’s nominal current as the
maximum level. The pump is normally supplied without an electrical cable and switch. For electrical connection, see
the diagram contained within the terminal board or on the motor rating plate.
DANGER
The rotation direction determines also the flow direction (see figure 10).
Check that the direction of rotation is correct before starting the pump for the first time or after resetting the
electrical connections.
WARNING
In the event of incorrect rotation direction wait for the pump to come to a complete halt, before changing the
connection and supplying power again.
In the matter of blowers and exhausters, the correct rotation direction can be verified with a brief start-up.
Briefly start up the Bora pump motor, observing that the rotation direction of the motor cooling fan is counterclockwise
(arrow). If this is not the case disconnect the network cables and reverse the two phases. You can see if the sense of
rotation is correct, as soon as the rotation begins. Turn it off immediately and go on with the installation procedures.
In the matter of booster, the correct rotation direction can be verified bringing the pressure inside the pump to a value of
< 20 mbar, by switching on the primary pump. Then briefly start up the Bora pump motor and immediately turn it off,
making sure that the rotation direction of the motor cooling fan is counterclockwise (arrow). If this is not the case
disconnect the network cables and reverse the two phases.
Fig. 10