Electric Wiring - Saci pumps MN Serie Manuel

INSTRUCTIONS FOR INSTALLING AND OPERATING
SACI PUMPS SURFACE MOTORISED PUMP
Conditions for using and installing the pumps
The Saci surface motorised pumps in normal working conditions.
Are used for pumping clean water and other liquids that are not chemically or mechanically harmful
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for the pump materials, that are not explosive, with a temperature of:
• From +5°C to +50°C for models with noryl hydraulics or which have one or more diffusers;
• From -15°C to +90 °C for models with metal hydraulics (brass, steel, cast iron);
It should be remembered that high temperature in the pumped liquid, like the altitude of the instal-
lation location for the motorised pump, reduce the intake capacity of the pump.
They must be installed in a well-ventilated place, dust free, protected from the weather, with an
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ambient temperature between 5 and 40°C. When the machine is installed, it is advisable to leave
sufficient space around it for any repair work or dismantling. It should be remembered that the am-
bient temperature and altitude of the installation location effect the possibility of the electric motor
working at full charge; excessive ambient temperature and low air density in fact reduce the cooling
capacity of the electric motor.
They are provided with a foot/base at the bottom (on the pump or tank); for safety reasons it is
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advisable to anchor the autoclaves using the holes in the supporting foot/base; it should not be in-
stalled with the motor underneath the pump body (except for vertical models in the ULTRA and MS
series); for safety reasons the motorised pump should be anchored using the holes on the feet/base;
it should not be installed with the motor underneath the pump body.
They are equipped with:
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• CM normalised models: flanged openings with a counter-flange, axial aspiration and radial deli-
very upwards;
• Other models: threaded openings, axial aspiration (or lateral on the CP, PM-A, MD models) and
radial delivery upwards.
They must not be subjected to:
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• more than 30 start-ups per hour at regular intervals: models with rated output up to 2.2 kW;
• more than 15 start-ups per hour at regular intervals: models with rated output from 3 to 7.5 kW;
• more than 10 start-ups per hour at regular intervals: models with rated output from 10 to 37 kW;
The greater the power given off by the machine the lower the number of starts. Pay special attention
to the operations of pumps with the "press-control" and/or "press-flow meter" systems: the slight-
est even unperceivable pressure drop in the plant could cause a high number of starts/stops to the
pump, causing it to wear very quickly. It is advisable to install an autoclave tank, even a small one
of 0.5-1 litres, on pumps with these systems.
The pumps can support a maximum working pressure (equal inlet pressure + closed delivery valve
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head) of:
• CAM/JMC/INOX/AP75-100/PM-CP45/MD/CB100/CM50-75-100/CS/CR/CH: 6 bar;
• CAM/CAB/AP150÷300/PM80/CP75/MB/CM160÷550/MPX/MPA: 8 bar • CM normalised series: 10 bar
• CB160÷1500: 11 bar.
Piping
The piping must be fixed and anchored to its supports, and connected so that it does not transmit any
thrust, tension or vibrations to the pump. - Fig. 4 -
The internal diameter of the piping depends on its length and the delivery it has to support: it must be
chosen so that the speed of the liquid does not exceed 1.4 – 1.5 m/second on intake and 2.4 – 2.5 m/
second on delivery; in all events, the diameter of the piping must not be less that the diameter of the pump
outlets. Before installing the piping, check that it is clean inside
The intake piping: - Fig. 5 -
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• must be as short as possible, without narrowing or sharp changes in direction;
• must be perfectly sealed and resist the depression created by the pump during aspiration;
• must rise up towards the pump, to prevent air pockets that could block priming the pump or
cause it to cut out.
For aspiration operations, install a foot valve with a suction rose: if a self-priming pump is installed, the
foot valve can be replaced by a check valve installed directly on the inlet opening. For the motorised pump
to work correctly, the end of the intake pipe must be immersed in water that is at least twice as deep as
the diameter of the pipe itself. - Fig. 3 -
The delivery piping should have a check valve and a regulation valve installed. The check valve
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should be installed upstream from the regulation valve, to protect the pump from water hammering
and block the reverse flow through the impeller should the pump cut out unexpectedly. The regula-
tion valve serves to regulate the delivery, head and absorbed power. Install a pressure gauge on the
delivery pipe). - Fig. 3 –
For a self-priming pump, in the event of very high priming-aspiration levels (above 5 meters and less than
9 meters), the delivery piping must have a straight, vertical stretch of at least 1 meter.

Electric wiring

Carefully select the power leads according to their length and the current given on the motorised pump
specification plate. Prepare the ends of the power leads and ground leads so that when they are connected,
they remain firmly fixed under the terminal nuts and ground screw. Electrical wiring must be carried out
by a qualified electrician, respecting current regulations in force.