Use With Gas/Diesel Engines And Electric Motors - Bertolini GIARDINAGGIO Serie Manual De Uso Y Mantenimiento

3.6

Use with gas/diesel engines and electric motors

WARNING!
All the electrical connections must be made by specialized technicians.
Do not work on the pump or electric pump with wet hands, in a wet environment or
on a wet surface.
Contact the Bertolini customer assistance service or the dealer from whom the
pump was purchased for any help required with the installation or use. This will
prevent annoying faults in relation to which the manufacturer hereby declines all
liability for non-compliance.
If electric motors are used, comply with the provisions established by the pertinent
–
standard EN60204-1 in order to avoid risks of an electrical nature.
The pulleys and belts must be adequately protected and covered in a suitable way, in
–
accordance with the norms in force.
It is essential to periodically check to make sure that the pulleys are correctly aligned
–
and the belts tightened to the extent indicated by the manufacturer.
Besides leading to early wear on the belts, failure to comply with the regulations may
–
cause the pump to overheat and damage to the bearings.
Maximum transmission ratio
After determining K, you can calculate the motor or pump pulley diameter:
Motor pulley pitch diam.: m.p. Ø =
Pump pulley pitch diameter = p.p. Ø = motor pulley pitch Ø x K
Calculation example:
The calculation must establish the pitch diameter of a pulley to apply to a 3000 r.p.m.
engine that must operate a PA530 Bertolini pump (550 rpm) in which a Ø 350 mm pulley
must be installed, as indicated in the Bertolini catalogue and in the chart on the next page:
First calculate the transmission ratio K:
engine r.p.m.
K= =
pump r.p.m.
Having determined K and after having chosen the pump pulley Ø, the engine pulley Ø can
be calculated in the following way:
Pump pulley Ø
E.P.Ø=
K
Motor R.p.m.
Pump R.p.m.
Pump pulley pitch diam
K
3000
= 5.45
550
350
= = 64 mm
5.45
= K
64