Free-Standing Submerged Installation; Electrical Connection - Grundfos SEG Instrucciones De Instalación Y Operación

7.2 Free-standing submerged installation

Pumps for free-standing submerged installation can
stand freely on the bottom of the pit or similar
location.
The pump must be mounted on separate feet
(accessory).
In order to facilitate service on the pump, fit a flexible
union or coupling to the discharge pipe for easy
separation.
If a hose is used, make sure that the hose does not
buckle and that the inside diameter matches that of
the discharge port.
If a rigid pipe is used, the union or coupling, non-
return valve and isolating valve should be fitted in
the order mentioned, when viewed from the pump.
If the pump is installed in muddy conditions or on
uneven ground, it is recommended to support the
pump on bricks or a similar support.
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. It
is recommended 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 pit 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.
If several pumps are to be installed in the
same pit, the pumps must be installed at
Note
the same level in order to allow for
optimum utilization of pump alternation.
12

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 an
IEC trip class 10 or 15.
Warning
The permanent installation must be fitted
with earth leakage circuit breaker (ELCB)
with a tripping current < 30 mA.
Warning
Pumps installed in hazardous locations
FM
must be connected to a control box with a
motor protection relay with an IEC trip
class 10.
Warning
Do not install Grundfos control boxes,
pump controllers, Ex barriers and the free
end of the supply cable in potentially
explosive environments.
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 lead is connected to the
external earth terminal of the pump via a
lead with a secure cable clamp. Clean the
surface for external earth connection and
fit the cable clamp.
FM
The cross-section of the earth conductor
must be at least 4 mm
K (PVT 90 °) yellow/green.
Make sure that the earth connection is
protected from 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.
2
, e.g. type H07 V2-