Publicité
Les langues disponibles
Les langues disponibles
OPERATING AND MAINTENANCE MANUAL
CENTRIFUGAL ELECTRIC PUMP CB SERIES
In the case of a self-priming pump, the bottom valve can be replaced by
a check valve mounted directly on the suction inlet. In order to use it as a
positive head pump, a gate valve must be installed on the pipe upstream
from the pump. (See Fig.3) The delivery pipe must be fitted with a check
valve (to protect the pump from water hammer and to prevent the backflow
of liquid from the pipe through the impeller) and a flow regulator gate valve
downstream from the check valve in order to regulate the flow, the head and
the power of the pump. (See Fig.3) In the case of self-priming electric pumps
for high priming-suction heights, (greater than 5 m but anyway less than 9 m)
the delivery pipe must have a straight and vertical section at least 1 m long.
10.
Conexión eléctrica
For all the pumps, the electrical power cables must be sized according to their length
and the current indicated on the pump data plate. Prepare the ends of the power and
ground conductors so that the conductors cannot slip off during installation when the
corresponding terminal block nuts and the ground screw are tightened.The electrical
connection must anyway be carried out by qualified personnel, in compliance with
the current regulations in the country in which the equipment is used. Make sure that
the voltage / frequency of the mains power supply is the same as the one indicated
on the data plate of the electric pump: then connect the terminals following the
diagrams shown in Fig. 8 and / or located inside the terminal box cover.
Earth the electric pump using the specific terminal. Make sure that the mains power
supply is properly earthed and that therefore the electric pump is earthed.
Some models of single-phase electric pumps, fitted with motor protectors, could
restart without warning if the motor protector tripped due to overheating: disconnect
the power supply before carrying out any work on the electric pump. Both threephase
and single-phase electric pumps must anyway be permanently connected to the
mains power supply and a suitable protection device installed (suitably rated thermal
magnetic circuit breaker incorporated in the fixed wiring) that ensures an all pole
disconnection of the mains power supply. The maximum permissible tolerance
between the actual electrical supply voltage and the nominal value indicated on the
data plate of the electric pump is ± 10% for three-phase electric pumps and ± 6% for
single-phase electric pumps.
11.
Start-up and operation
Make sure that the motor shaft is free to rotate before starting the machine. The
smaller electric pumps have a slot for inserting a screwdriver at the end of the shaft
on the fan side for doing this; if the shaft does not move, lightly tap the screwdriver
with a plastic headed hammer. (Fig.6)
www.proindecsa.com / proindecsa@proindecsa.com
13
Publicité
