ATTENTION:
Do not connect ball valves to this pipeline.
5.5 Electric connection
The control panel and electric connections must be carried out by skilled per-
sonnel and conform to the EN 60204-1 rules or to other local regulations in the
Country of use. The electric equipment must comply with EN 61000-6-4 and EN
61000-6-2 standard concerning electromagnetic compatibility, emission stand-
ard and immunity for industrial environments
Check the main voltage and frequency in use to correspond to the data stamped
on the motor name plate.
The electric motor must be protected against overload. The full load amperage
value on the motor name plate must be considered when sizing the electrical
components and motor protection against overloading.
Make sure the grounding is correctly done.
Carry out the electric connection following the diagram shown on the motor
terminal box.
Check the direction of rotation by starting the pump for a short time (2-3 sec-
onds). The correct direction is shown by the arrow on the pump:
EM4 - EM4/B
see on page 20 –
EM8 - EM8/B
see on page 21 –
EM 12 - EM
12/B
see on page 24 –
EM 20 - EM20/B
see on page 25-
EM 28 - EM 28/B
see
on page 26 –
EM 40 - EM 40/B
see on page 27.
In case of wrong rotation, it is necessary to change the motor rotation by ex-
changing position of two of the three connections in the motor terminal box.
5.6 Commissioning
The pump is supplied without lubricating oil.
WARNING:
The operation without oil causes big damages to the pump.
Carry out the first filling up through the plug (
E
) up to the half of the sight glass (
F
)
and close the plug (
G
):
EM4 - EM4/B
see on page 20 -
EM8 - EM8/B
see on page 21 -
EM12 - EM12/B
see on page 24 -
EM20 - EM20/B
see on page 25 -
EM28 - EM28/B
see on page
26 -
EM40 - EM40/B
see on page 27.
WARNING:
A quantity of oil greater than necessary may clog the oil separator
and damage the pump or the electric motor.
Start the pump and take it to the maximum vacuum level for at least 2 minutes.
Stop the pump, check again the oil level and add it if needed, in order to get to the
correct oil level.
5.7 Suggestions for the use
When the room temperature is lower than 10°C, it is good to let the pump operate
at maximum vacuum level for about 5 minutes. During this period the pump may not
reach the stated pressure limits.
WARNING for EM4:
Allow the pump to achieve the maximum vacuum (within 5 minutes)
cyclically, so that a regular recovery of the oil knocked down by the
exhaust filter is assured. Alternatively, stop the pump every five min-
utes.
WARNING:
Avoid operating pump for long periods with inlet port at atmospheric
pressure. Avoid frequent stop-starting. (It is advisable not to exceed
30 startings per hour).
5.8 Water vapour suction (excluded EM4 - EM4/B)
In order to pump down water vapour it is essential to take the pump temperature to
its operating value. In case there are other condensate in the oil, let the pump run at
maximum vacuum for at least thirty minutes, at the end of the working cycle.
It is advisable to carry out this operation before stopping the pump for a long time.
The gas ballast valve will allow the elimination of water condensate from the lubri-
cating oil.
15
ENG
