Manual Speroni ME (page 12 of 52) (English, German, French, Italian, Spanish)

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The suction line should be slightly inclined up towards

the pumps and any reducers should be eccentric

(see fig. 1) to prevent air locks.

In any such installations where the operating condi-

tions require that the pump delivery be restricted or

modulated, we recommend that a relief valve be fitted

to the delivery pipe, or a re-cycle by-pass put between

the delivery and the supply reservoir.

We recommend that a non-return valve be fitted to

the delivery pipe close to the pump to protect it from

any dynamic stresses caused by water hammer, and

a foot valve be put at the end of the suction pipe to

facilitate priming.

4.1 Wiring up motor

Make sure that the specifications written on the motor

plate are correct for the electrical supply line. Remove

the terminal box cover, inside which is illustrated the

wiring diagram.

Caution: the unit must be grounded before you make

any other connections.

Single phase motors

Wire up the motor as illustrated inside the terminal

box cover.

The connections are pre-arranged for the correct

direction of rotation - which is anti-clockwise when

the pump is viewed from the pump inlet.

Three phase motors

The thermal overload protection is to be provided by

the user, with motor protector complete with remote

control switch, thermal relay and fuses installed

upstream.

The overload relay must be set to the full rated load

value (In) written on the motor plate. The thermal relay

may be set to a current value slightly lower than the

full load value when electric pump is definetely un-

derloaded, but the thermal overload protection must

not be set to current values higher than the full load

values. Any operation at current values slightly higher

than the full load values (max. 1.1 In) may be tolerated,

provided they are only due to occasional sudden

changes in the supply voltage.

We also recommend that an omnipolar switch be

installed upstream of the motor protector in order to

fully insulate the electric pump from the electric supply

line. Where two pumps are installed (one being a

stand-by unit) a commutator should be provided

between the two pumps in order to equalize the wear

rate of both pumps.

4.2 Checking the direction of rotation of the

electric pumps with three phase motors

The direction of rotation may be checked before the

pump is fitted with the liquid to be pumped, provided

it is run for very brief intervals only.

The pump must not be run before it is filled with

liquid. Continuous dry running would damage the

mechanical seal beyond repair.

If the direction of rotation is not anti-clockwise, as

viewing the pumps from the pump inlet, then inter-

change two supply leads.

4.3 Priming

Priming is accomplished by filling the pump and the

suction line with the liquid to be pumped. To fill the

pump, remove the filling plug and proceed as follows:

– Pump with positive suction head: open the sluice

valve at the suction and let the liquid flow in until

it brims over the filling plug.

N.B. The function of the sluice valve at the suction

is to intercept the liquid flow and not to control the

flow rate as this is only accomplished by a sluice

valve fitted to the dellivery.

– Pump with negative suction head, fitted with foot

valve: fill the pump and the suction line through the

filling plugs. This operation may be shortened by

filling the pump through the pump outlet. During

the filling stage take care to let all air escape please

note that filling is completed correctly only after

the water level at the filling plus is stable and all air

bubbles have disappeared.

– Pump with negative suction head, without foot

valve. In this case filling is a bit more complicated

as a pressurized liquid or air source would be

required, along with an ejector or a vacuum pump.

In such instance, a perfectly watertight sluice valve

must be fitted to the delivery.

As fitting is completed, start the pump and check

that both pressure and flow rate are constant; if that

is not the case, stop the pump and repeat the entire

operation.

5. Running

If all the above operations-installation, filling, etc,. -

are carried out correctly, the pump will offer quiet

running.

– With liquid temperatures higher than the test tem-

perature, the manometric delivery head will decrease

in relation to the specific weight of the liquid.

– When handling viscous liquids, both flow rate and

head would decrease, while the power input would

increase.

INSTRUCTIONS FOR THE INSTALLATION AND USE OF ELECTROPUMPS

In such instance the maximum rated flow rate should

be reduced, to avoid the overload protection tripping

too often.

– The pump should not be subjected to more than

20 startings per hour, to avoid excessive thermal

stress on the motor.

Where a star-delta starter is used, the above number

of startings per hour may the slightly increased.

– The pump should not run for long periods with

closed sluice valve at the delivery. Where this is

inevitable, or in all such instances where the delivery

rate is to be modulated, proceed as directed under

the section “installation”.

– All pumps which are installed in places unprotected

from frost must be emptied whenever they remain

inoperative, and flushed inside with water emulsified

with a corrosion inhibitor.

6. Maintenance

The electric pumps do not require any scheduled

maintenance, as the motor bearings are pre-packed

for life and the mechanical seals are lubricated by

the pumped liquid.

7. Connection

The six terminal arrangement with delta ( ) or star

( ) connection allows for the motors.

Star connection

( )

400 V ( )

700 V ( )

240 V ( )

415 V ( )

230 V ( )

400 V ( )

Delta connection

( )

V2W1

U2U1

U2W2

U1W1

T R

S TR

V1 W1U1

U2 V2W2

S TR

V1 W1U1

U2 V2W2

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Speroni ME Manual

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