Delta 50-900 Series User Manual download pdf (Page 12)

ENGLISH

7.6

Ensure that the plant is provided with an air bleeding system and that the expansion chamber (if

provided) is installed before the intake aperture. If the pump is installed on the delivery of an

open vessel circuit, ensure that the safety pipe is connected before the pump.

7.7

When fitting the pump on the system, ensure that the metal pipes do not weigh down on the pump

body, transmitting excess forces or stress that could cause cracks or breakages

7.8

To avoid transmitting noise and vibrations, fit vibration-damping couplings on the intake and

delivery apertures.

ELECTRICAL CONNECTION

Caution! Always follow the safety regulations.

Scrupulousl

follow the wirin

dia

rams inside the terminal

board box and those on page 5 of this manual.

8.1

The electrical connections must be made exclusively by skilled personnel (see point 6.1) as

required by the safety regulations in force.

The requirements of the electric energy supply company must be scrupulously complied

with.

In the case of three-phase motors with star-delta start, ensure that the switch-over time from star to

delta is as short as possible and that it falls within table 8.1 on page 102.

8.2

Before opening the terminal board and working on the pump, ensure that the power has been

switched off

8.3

Check the mains voltage before making any connection. If it is the same as the voltage on the data

plate, proceed to connect the wires to the terminal board, giving priority to the earth lead. (Fig.

D).

8.4

ENSURE THAT THE EARTH SYSTEM IS EFFICIENT AND THAT THERE IS THE

POSSIBILITY OF MAKING A GOOD CONNECTION.

8.5

The pumps must always be connected to an external switch.

8.6

Single-phase motors are provided with thermal overload protection and may be connected directly

to the mains.

8.7

Three-phase motors must be protected with special remote-control motor-protectors calibrated for

the current shown on the plate.

8.8

In systems where twin pumps are fitted, provide separate wiring and switches for each pump so as

to ensure continuous service.

STARTING UP

9.1

As well as being at high temperature and high pressure, the fluid in the

system may also be in the form of steam.

DANGER OF BURNING.

It may be dangerous even to touch the pump or parts of the system.

Before starting up you must fill the system with water and bleed the air. Bleed the residual air

from the pump body through the bleeding cock provided (not present on version ALM 200 – ALP

800) until only water comes out (Fig. E). This ensures that the mechanical seal is well lubricated

and that the pump immediately starts to work regularly. Dry operation, even for brief periods,

causes irreparable damage to the mechanical seal.

9.2

Switch on the power and, on three-phase versions, check that the motor is turning in the right

direction, that is clockwise when viewed from the fan side, Fig. F. Otherwise invert any two

phase leads, after having disconnected the pump from the mains.

9.3

With the pump running, check the supply voltage at the motor terminals, which must not differ

from the rated value by +/- 5% (Fig. G).

9.4

With the unit at regular running speed, check that the current absorbed by the motor does not

exceed the value on the data plate..

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Delta 50-900 Series User Manual Page 12

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