Electrical Connections; Start-Up - Mountfield BHP 4/7 Instrucciones Para La Instalación Y El Mantenimiento

7.

ELECTRICAL CONNECTIONS

Attention: always respect the safety regulations! Electrical installation must be carried out by an expert, authorized electrician,
who takes on all responsibility.
The system must be correctly and safely grounded as required by the regulations in force.
If a plug-connected pump is connected to an electric installation where an electrical circuit breaker (voltage sensing ELCB,
residual-current device RCD or residual-current circuit device RCCB) is used as an additional protection, this circuit breaker
must be marked with the first or both of the symbols shown below. If the pump is terminal-connected, the circuit breaker
must be marked with both of the symbols below:
The thermal magnetic circuit breaker must be correctly sized.
The mains voltage must be the same as that on the motor data plate.
Connect to the mains with a two-pole switch, with contact opening distance of at least 3 mm.
Correctly size the cross section of the power supply cable in relation to the length to avoid voltage losses.
Install a high-sensitivity differential switch (0.03A) as additional protection or compatible with the control equipment (e.g.
Inverter).
In fixed installations, International Standards require the use of isolating switches and fuse holder bases.
The electrical connection to any electronic equipment against dry running must be carried out in compliance with the wiring
diagrams given in the use and maintenance manuals of the electronic control units.
Cable connections below the water level must have a vulcanized joint to ensure tightness.
7.1 SINGLE-PHASE WIRING DIAGRAM (50/60Hz)
1- Common
2- Run
3- Start
C- Capacitor
T- Thermal relay
8.

START-UP

1. After lowering the pump into the well or tank, start it up at a reduced flow rate, checking the current consumption and the relative
pressure. Gradually increase the flow rate to check for changes in the water level and any sand content. In the case of large
quantities of sand in the water being transported, the internal parts of the pump will be subject to considerable wear. If the sand
content is too high, the pump may become blocked or unprimed. In this case, it is necessary to contact the company that made
the well for the necessary assistance. If the flow stops, switch off the pump immediately to avoid dry running or running with the
motor blocked.
2. Check the current consumption, which should drop to the value of the rated current no more than 2 seconds after switching on. If
this does not occur, the pump must be stopped immediately and the cause of the fault must be sought.
3. Run the pump for a few hours to verify that the borehole flow rate is sufficient in relation to the pump itself.
If the water does not come out at the first start even if the motor is running normally and the maximum suction depth has been
respected, it is probable that the pump will not be able to expel the air inside the delivery pipe, thus preventing the valve from opening.
Fill the delivery pipe completely with water and repeat the start-up operation.
ENGLISH
Blue
Red
White
Yellow/Green
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