Free-Standing Submerged Installation; Electrical Connection - Grundfos SL1.50 Installation And Operating Instructions Manual

9. Hang up the end of the chain on a suitable hook
at the top of the tank and in such a way that the
chain cannot come into contact with the pump
housing.
10. Adjust the length of the motor cable by coiling it
up on a relief fitting to ensure that the cable is not
damaged during operation. Fasten the relief
fitting to a suitable hook at the top of the tank.
Make sure that the cables are not sharply bent or
pinched.
11. Connect the motor cable and the monitoring
cable, if any.
The free end of the cable must not be
Note
submerged as water may penetrate
through the cable into the motor.

7.2 Free-standing submerged installation

Pumps for free-standing submerged installation can
stand freely on the bottom of the tank or the like.
See fig. B, page 9.
In order to facilitate service on the pump, fit a flexible
union or coupling to the elbow on the discharge line
for easy separation.
If a hose is used, make sure that the hose does not
buckle and that the inside diameter of the hose
matches that of the pump discharge port.
If a rigid pipe is used, fit the union or coupling, non-
return valve and isolating valve in the order
mentioned, when viewed from the pump.
If the pump is installed in muddy conditions or on
uneven ground, we recommend to support the pump
on bricks or a similar support.
Proceed as follows:
1. Fit a 90 ° elbow to the pump discharge port and
connect the discharge pipe/hose.
2. Lower the pump into the liquid by means of a
chain secured to the lifting bracket of the pump.
We recommend to place the pump on a plane,
solid foundation. Make sure that the pump is
hanging from the chain and not the cable.
3. Hang up the end of the chain on a suitable hook
at the top of the tank and in such a way that the
chain cannot come into contact with the pump
housing.
4. Adjust the length of the motor cable by coiling it
up on a relief fitting to ensure that the cable is not
damaged during operation. Fasten the relief
fitting to a suitable hook. Make sure that the
cables are not sharply bent or pinched.
5. Connect the motor cable and the monitoring
cable, if any.
The free end of the cable must not be
Note
submerged as water may penetrate
through the cable into the motor.

8. Electrical connection

Warning
Connect the pump to an external mains
switch which ensures all-pole
disconnection with a contact
separation according to EN 60204-1,
5.3.2.
It must be possible to lock the mains
switch in position 0. Type and
requirements as specified in EN 60204-
1, 5.3.2.
The electrical connection must be
carried out in accordance with local
regulations.
Warning
The pumps must be connected to a
control box with a motor protection
relay with IEC trip class 10 or 15.
Warning
Pumps for hazardous locations must
be connected to a control box with a
motor protection relay with IEC trip
class 10.
Warning
Do not install Grundfos control boxes,
pump controllers, Ex barriers and the
free end of the power cable in
potentially explosive environments.
The explosion protection classification
of the pump is CE
X. The classification of the installation
site must be approved by the local fire-
fighting authorities in each individual
case.
On explosion-proof pumps, make sure
that an external earth conductor is
connected to the external earth
terminal on the pump using a
conductor with a secure cable clamp.
Clean the surface of the external earth
connection and mount the cable clamp.
The cross section of the earth
conductor must be at least 4 mm
type H07 V2-K (PVT 90 °) yellow/green.
Make sure that the earth connection is
protected against corrosion.
Make sure that all protective equipment
has been connected correctly.
Float switches used in potentially
explosive environments must be
approved for this application. They
must be connected to the Grundfos
LC, LCD 108 pump controller via the
intrinsically safe LC-Ex4 barrier to
ensure a safe circuit.
II 2 G, Ex d IIB T4
2
, e.g.
31