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

7.2 Free-standing submerged installation

Pumps for free-standing submerged installation can
stand freely on the bottom of the pit or similar
location. See fig. C on page 584.
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, we recommend you 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 or hose.
2. Lower the pump into the liquid by means of a
chain fastened to the lifting bracket of the pump.
We recommend you 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
Note
installed at the same level in order to
allow for optimum utilization of pump
alternation.
14

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
When the pump has been installed,
there must be at least 3 m free cable
above the maximum liquid level.
Warning
Pumps installed in hazardous locations
must be connected to a control box
with a motor protection relay with an
IEC trip class 10.