Column Pipe Installation; Electrical Connection; Wiring Diagrams - Grundfos S2 Instrucciones De Instalación Y Funcionamiento

4.1.6 Column pipe installation

Install pumps for column pipe installation permanently in a
column pipe. Grundfos does not normally supply the column pipe.
Dimensioning of the column pipes is suggested in the pump
specific dimensional drawings.
1. Fit the seat ring to the bottom of the column pipe.
2. Clean out debris from the pit.
3. Before lowering the pump into the column pipe, check the
cables visually for cuts or ruptures which may have been
caused by rough handling during transportation or installation.
4. Lower the pump into the column pipe by means of a certified
chain secured to the lifting bracket of the pump. The pump will
rest on the conical surface of the seat ring. Normally the
friction between the conical surfaces will prevent the pump
from rotating. As an extra precaution there are three guide
pins on the seat ring which will limit the possible rotation to
maximum 60 °.
5. Hang up the end of the chain above or at the top of the
column pipe in such a way that the chain cannot come into
contact with the pump.
6. Adjust the length of the cables, but remember to have enough
cable length to be able to service the pump. Make sure that
the cables are not sharply bent or pinched. Fix the cables in
such a way that there is no extra slack inside the column pipe.
In the case of long column pipes, it may be necessary to
arrange cable support for the cables inside the column pipe. If
necessary, please contact Grundfos.
7. Connect the power cables and the control cable.
Fig. 11 Column pipe installation pump type ST

4.2 Electrical connection

Connect the pump to an external main switch ensuring all-pole
disconnection with a contact separation according to National
Electrical Code (NEC) and all local codes. It must be possible to
lock the main switch in position 0.
The supply voltage and frequency are marked on the pump
nameplate. Make sure that the motor is suitable for the power
supply available at the installation site.
The pump must be connected to a motor-protective circuit
breaker.
The motor is effectively earthed via the earth conductor of the
power cables and the pipes. The motor top cover for Ex pumps is
equipped with connections for external earthing or an
equipotential bonding conductor.

4.2.1 Wiring diagrams

72 and 74:
Standard power cables
35.4 in (900 mm)
78:
43.3 in (1100 mm)
All:
15.7 in (400 mm)
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
Carry out the electrical connection in accordance
with local regulations.
Connect the pumps to a control box with a motor
protection relay with an IEC trip class 10 or 15.
Connect pumps installed in hazardous locations to a
FM
control box with a motor protection relay with an IEC
trip class 10.
DANGER
Short-circuit
Death or serious personal injury
- For Ex models in dry-installation, version D and H,
connect an external earthing.
1
U1
2
W1 U1
U2
3
V1
V1
4
V2
5
W1
W2 U2
6
W2
V2
Fig. 12 Wiring diagram for standard power cable
U1 U2
U1
U2
V1 V2
V1
V2
W1 W2
W1
W2
11