Electrical Connection - Grundfos S Series Installation And Operating Instructions Manual

4.1.4 Column pipe installation
Pumps for column pipe installation must be installed
permanently. Grundfos does not supply column pipes,
however; they are available on order. For the
appropriate column pipes, seethe 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 for cuts or ruptures.
4. Lower the pump into the column pipe by a
certified chain secured to the lifting bracket. The
pump rests on the conical surface of the seat ring.
The friction between the conical surfaces prevents
the pump from rotating. As an extra precaution,
the three guide pins on the seat ring limit the
possible rotation to maximum 60 °.
5. Hang up the end of the chain above or at the top
of the column pipe, so the chain cannot come into
contact with the pump.
6. Adjust the length of the cables, but make sure to
have enough cable length for service. Make sure
that the cables are not sharply bent or pinched.
Fix the cables to avoid extra slack inside the
column pipe. In case of long column pipes, it may
be necessary to arrange cable support. If
necessary, contact Grundfos.
7. Connect the motor cables and the sensor cable.
A
Column pipe installation, pump type ST
Pos. Description
A Min. 350 mm
B Min. 150 mm

4.2 Electrical connection

DANGER
Electric shock
Death or serious personal injury
‐
Before starting any work on the prod-
uct, make sure that the power supply is
switched off and that it cannot be
switched on unintentionally.
Connect the pump to an external main switch
ensuring all-pole disconnection with a contact
separation according to EN 60204-1. It must be
possible to lock the main switch in position 0. Type
and requirements as specified in EN 60204-1.
The supply voltage and frequency are marked on the
nameplate. Make sure that the motor is suitable for
the power supply available at the installation site.
Carry out the electrical connection in ac-
cordance with local regulations.
The pump must be connected to a motor-protective
circuit breaker.
Connect the pump to a control box with a
motor protection relay with an IEC trip
class 10 or 15.
Connect pumps installed in hazardous lo-
cations to a control box with a motor pro-
tection relay with an IEC trip class 10.
The motor is effectively earthed by 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.
DANGER
Short-circuit
Death or serious personal injury
‐
For Ex models in dry-installation, ver-
sion D and H, connect an external
earthing.
B
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