Safety; Electrical Connection; Checking Of Direction Of Rotation; Installation - Grundfos Unilift AP12 Bedienungsanleitung

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2. Safety

Pump installation in wells must be carried

out by specially trained persons.

3. Electrical connection

Note: Depending on local regulations, a pump with

10 metres of mains cable must be used if the pump

is used as a portable pump for different applications.

The electrical connection should be carried out in

accordance with local regulations.

The pump must be connected to an external mains

switch. If the pump is not installed close to the

switch, this must be of a lockable type.

The operating voltage and frequency are marked on

the pump nameplate. Please make sure that the

motor is suitable for the electricity supply on which it

will be used.

As a precaution, the pump must be con-

nected to a socket with earth connection.

The permanent installation must be fitted

with an earth leakage circuit breaker

(ELCB) with a tripping current < 30 mA.

Three-phase pumps must be connected to an exter-

nal motor starter with differential release and with a

minimum contact gap of 3 mm. The set nominal cur-

rent of the motor starter must correspond to the elec-

trical data marked on the pump nameplate.

If a level switch is connected to a three-phase pump,

the motor starter must be magnetically operated.

Single-phase pumps incorporate thermal overload

protection and require no additional motor protec-

tion.

If the motor is overloaded, it will stop auto-

matically. When it has cooled to normal

temperature, it will restart automatically.

3.1 Checking of direction of rotation

(Three-phase pumps only)

The direction of rotation should be checked every

time the pump is connected to a new installation.

Check the direction of rotation as follows:

1. Position the pump so that the impeller can be

observed.

2. Start the pump for a short period.

3. Observe the rotation of the impeller. The correct

direction of rotation is indicated by an arrow on

the suction strainer (clockwise when seen from

the bottom). If the impeller rotates in the wrong

direction, reverse the direction of rotation by

interchanging two of the phases to the motor.

If the pump is connected to a piping system, the

direction of rotation can be checked as follows:

1. Start the pump and check the quantity of water or

the discharge pressure.

2. Stop the pump and interchange two of the

phases to the motor.

3. Start the pump and check the quantity of water or

the discharge pressure.

4. Stop the pump.

Compare the results taken under points 1 and 3. The

connection which gives the larger quantity of water

or the higher pressure is the correct direction of rota-

tion.

4. Installation

The installation of the pump must be car-

ried out by specially trained persons.

Unilift AP35 and AP50: Care must be

taken to ensure that persons cannot come

into contact with the pump impeller.

4.1 Connection

For permanent installation, it is recommended to fit a

union, a non-return valve and an isolating valve in

the discharge pipe.

If the pump is installed in a pit with a minimum free

cable length of 100 mm, see fig. 6, the minimum pit

dimensions must be as shown in fig. 2.

Furthermore, the pit should be dimensioned accord-

ing to the relation between the water flow to the pit

and the pump capacity.

‹

550 mm

Fig. 2

4.2 Pump location

The pump can be used in vertical or horizontal posi-

tion with the discharge port as the highest point of

the pump, see fig. 3.

During operation, the suction strainer must always

be completely covered by the pumped liquid.

Fig. 3

When the pipe/hose has been connected, place the

pump in its operating position.

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Diese Anleitung auch für:

Unilift ap35 Unilift ap50

Safety; Electrical Connection; Checking Of Direction Of Rotation; Installation - Grundfos Unilift AP12 Bedienungsanleitung

2. Safety

3. Electrical connection

3.1 Checking of direction of rotation

4. Installation

4.1 Connection

4.2 Pump location

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