Start-Up; Water Connection; Electrical Connection - Espa Multi VX Manuel D'instructions

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5.1.4 Selecting the Foot Valve

Install a foot valve at the end of the suction pipe if the level of the liquid source is lower than the pump's. Refer to the illustrations in section 3.1.3 and the

diagrams in section 11.12.

5.1.5 Selecting the Electric Control Panel

The motors must be suitably protected against overload and short circuits.

Make sure that the panel's electric ratings match those of the electric pump. Improper combinations may cause problems and fail to guarantee the

protection of the electric motor.

The single-phase electric pumps, with up to 1.5 kW power, have an automatic reset protection incorporated in the motor (motor protector).

Avoid the possibility of dry running, i.e. the pump must not run without water inside it. Make sure that the electric panel is equipped with a dry running

protection system to which you must connect a pressure switch or float switch or sensors or other suitable device.

If you use thermal relays, we recommend those that are sensitive to phase failure.

5.1.6 Selecting the Electric Motor

If you buy the pump without motor and couple it to a motor other than those described in our catalogue, the safety of the unit must be guaranteed by

the person making the coupling.

You can use single-phase or three-phase motors whose size and power comply with the European standards.

Use dynamically balanced motors, with half-sized key in the shaft extension (IEC 60034-14) and with normal vibration rate (N).

6. Start

6. Start- - - - up

6. Start

6.1 Water Connection

Qualified installation technicians in compliance with the regulations in force must make the water connections.

In case of connection to the water system, the regulations issued by the competent authorities (municipal, public utility company) must be observed.

Authorities often require the installation of a backflow prevention device, such as a disconnector or check valve or disconnection tank.

The suction pipe must be perfectly sealed and watertight. If the pump/electric pump is installed near dwellings, suitable pipes or flexible unions should be

provided to prevent the transmission of vibrations from the pump to the pipes. Install on-off valves on the suction and delivery sides to avoid having to drain

the system before maintenance, repair or pump replacement operations can be performed. Whenever necessary, provide a by-pass circuit to prevent the over-

heating of the water inside the pump.

Refer to the illustrations in section 3.1.3 and the diagrams in section 11.12.

6.2 Electrical Connection

A qualified installation technician in compliance with the regulations in force must perform the electrical connections.

Make sure that the supply voltages and frequencies are suited to the characteristics of the electric motor. Check the motor rating plate.

Provide suitable general protection against short circuits on the power line.

Before proceeding, make sure that all the connections (even those that are potential-free) are voltage-free.

The power supply line must be provided with the following devices (unless otherwise specified by the local regulations in force:

A short-circuit protection device

A high-sensitivity differential device (30mA) providing additional protection against electric shock in case the grounding system is inefficient.

A mains isolator switch with a contact gap of at least 3 millimeters.

Ground the system according to the regulations in force. First of all, connect the external protection conductor to the PE terminal, making sure that it is longer

than the phase conductors. The selection of the conductors (gauge, material, sheath material...) must take into account the actual operating conditions.

Protect the electrical conductors from too high temperatures, vibrations and collisions.

To facilitate the connection, the terminal board can be placed in one of the four 90° positions. To obtain the most convenient position for the connection of the

power supply cables, remove the 4 adaptor/motor fastening bolts and rotate the motor to the desired position without removing the coupling between the

motor shaft and the pump shaft. Replace the 4 bolts and tighten them. Remove the screws that fasten the terminal box cover and make the connections as

shown on the back of the cover and in the diagrams in section 11.14.

6.2.1 Overload protection (single- - - - phase motors)

6.2.1 Overload protection (single

The single-phase electric pumps, up to 1.5 kW power, have an automatic reset protection incorporated in the motor (motor protector). Be careful

because the pump could start up suddenly once the motor winding has cooled down.

For versions with 2.2 kW and higher powers, you must provide the overload protection (thermal relay or motor protector). If you use a different motor

from the standard one we provide, make sure you read the operating instructions to see whether the protection is provided or not.

Adjust the thermal relay or motor protector to the nominal current value of the electric pump or to the operating current in case the motor is not used at full

load.

phase motors)

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information for installers

Table des Matières