Safety; Electrical Connection; Checking The Direction Of Rotation - Grundfos Unilift AP35B Instrucciones De Instalación Y Funcionamiento

3. Safety

Warning
Pump installation in wells must be
carried out by specially trained
persons.

4. 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 must be carried out in
accordance with local regulations.
The operating voltage and frequency are marked on
the pump nameplate. Make sure that the motor is
suitable for the power supply on which it will be used.
Warning
As a precaution, the pump must be
connected to a socket with earth
connection. The installation must be
fitted with an earth leakage circuit
breaker (ELCB) with a tripping current
less then 30 mA.
The pump must be connected to an
external mains switch with a minimum
contact gap of 3 mm in all poles. If the
pump is not installed close to the
switch, the switch must be of a
lockable type.
Three-phase pumps must be connected to an
external motor-protective circuit breaker with
differential release. The rated current of the motor-
protective circuit breaker must correspond to the
electrical data marked on the pump nameplate.
If a level switch is connected to a three-phase pump,
the motor-protective circuit breaker must be
magnetically operated.
Single-phase pumps incorporate thermal overload
protection and require no additional motor
protection.
Note: If the motor is overloaded, it will stop
automatically. When the motor has cooled to normal
temperature, it restarts automatically.
6

4.1 Checking the direction of rotation

Three-phase pumps only
Check the direction of rotation every time the pump
is connected to a new installation.
1. Position the pump so that you can observe the
impeller.
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 top of the motor (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 pipe system, check the
direction of rotation in this way:
1. Start the pump and check the quantity of water or
the 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 pressure.
4. Stop the pump.
5. 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 rotation.
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