Electrical Connections; General Remarks - EBARA BHE Serie Manual De Empleo E Instalación

as minimum level).
Its presence reduces hydraulic shocks due to
starts and stops.

4. ELECTRICAL CONNECTIONS

Before starting to work on the pump,
make sure that the power supply has
been disabled and that it cannot be acci-
dentally switched on.

4.1 GENERAL REMARKS

The electrical connections should be carried out by
an authorised electrician according to the regula-
tions in force.
Supply voltage, current and cos j are quoted on
the motor plate that has to be kept within the elec-
trical panel.
The motor must be earthed and connec-
ted to the electric panel.
4.2 VERIFICATION OF ROTATION DIRECTION
When the pump has been connected to the power
supply, establish the current direction of rotation
as follows:
1. Start the pump and check the head supplied
with gate valve not completely closed.
2. Stop the pump and interchange two of the
phase connections.
3. Start the pump and repeat step 1. with the gate
valve in the same position.
4. Stop the pump.
Compare the results obtained in step 1. and 3..
The connection, which supplies the highest head,
is the correct one.
Note: The pump must not be started until the suc-
tion support has been completely submerged.
5. PUMP INSTALLATION
Before starting any work on the pump or
on the motor, make sure that the power
supply has been disabled and that it can-
not be accidentally switched on.
5.1 ASSEMBLING OF THE PUMP WITH THE
MOTOR
Place the pump on the motor in order that they are
positioned along the same axis and insert the
motor shaft in the pump shaft joint: the coupling
must not be forced.
Tighten the screws or the nuts that diagonally fix
the pump-motor flanges with a driving torque as
quoted in the following table.
Motor type Scerw
M8
Motor 4"
M12
Motor 6"
M16
Motor 8"
5.2 DELIVERY PIPING
If the pump is already coupled to the delivery
piping and you use a chain pipe wrench, tighten
the pump, holding it only by the delivery opening.
The threaded pipes must be connected in such a
way as to support the unscrewing action due to the
starting and stopping of the pump.
The thread of the pipe, which has to be screwed
into the pump, should not be longer than the
thread of the pump.
After screwing the pipe into the delivery opening,
tighten the screw assembled to avoid the loose-
ning of the first section of the pipe - see fig. 4.
Driving torque
Nm
18
100
200
13