Electrical Connection; Motor Protection; Checking Direction Of Rotation - Grundfos SPO Series Installation And Operating Instructions Manual

Fig. 4
SPO pump with base plate
in dry installation
Pos. Description
1 Pipework support
2 Non-return valve
3 Drain plug
4 Pipework support
5 Non-return valve
6 Suction strainer

6. Electrical connection

The electrical connection must be carried out by an
authorized electrician in accordance with local regu-
lations.
The mains voltage and frequency stated on the
pump nameplate should be compared with the actual
electricity supply available.
Before starting work on the pump/motor,
make sure that the electricity supply has
been switched off and that it cannot be ac-
cidentally switched on.
The pump must be connected to an exter-
nal mains switch with a minimum contact
gap of 3 mm in all poles.
The pump must be earthed.
8

6.1 Motor protection

Single-phase pumps:
The pump incorporates a thermal overload switch
and requires no additional motor protection.
1
2
Connect the pump supply cable as shown in fig. 5.
Fig. 5
1
3
4
Three-phase pumps:
The pump must be connected to a motor starter.
5
The set rated current of the motor starter must corre-
spond to the electrical data stated on the pump
6
nameplate.

6.2 Checking direction of rotation

Applies to three-phase pumps only:
The direction of rotation should be checked every
time the pump is connected to a new installation.
Proceed as follows:
1. Position the pump on a plane surface.
2. Start the pump and stop it immediately.
3. Observe the movement (jerk) of the pump when
started (seen from the top of the pump).
The direction of rotation is correct (clockwise) if
the pump sleeve moves counter-clockwise, see
fig. 6.
Fig. 6
If it is not possible to check the direction of rotation
as described above because the pump has already
been installed, proceed as follows:
When the motor has cooled to normal tem-
perature, it will restart automatically.
L
N
~ ~
3
L1 Black
L2 Blue
L3 Brown
Yellow/green
L1 L2
L3