Grundfos SE - Page 10

Vertical installation on auto-coupling
The free end of the cable must not be
submerged as water may penetrate into
the motor.
Minimum liquid level
Do not let the pump run dry.
Install an additional level switch to ensure
that the pump is stopped in case the stop
level switch is not working.
The level of the pumped liquid must be
controlled by level switches connected to
the motor control circuit.
Explosion-proof, submersible SL pumps
without cooling jacket must always be
completely submerged in the pumped
liquid to the top of the motor.
The pump housing of explosion-proof,
submersible SE pumps with cooling jacket
must always be completely covered by the
pumped liquid.
For a short period, the pump may be used
to pump down the liquid level to remove
the float layer. For explosion-proof pumps,
do not let it go below the stop levels shown
in fig.
The pump must not run dry.
To ensure adequate motor cooling, the following
minimum requirements must be met:
• Vertical installation on auto-coupling:
- SL pump: the pump must be completely
submerged in the pumped liquid to the top of
the motor. See level 1 on the figurebelow.
- SE pump: the pump must be submerged in the
pumped liquid until the bottom of the motor.
See level 2 on the figure below.
1
TM081911
Liquid level, SL
2
TM085627
Liquid levels, SE
Electrical connection
EMC shielding of power and control cables
must be connected and fixed by the
operator.
Connect pumps installed in hazardous
locations to a control box with a motor
protection relay with an IEC trip class 10.
1. Do not install pump controllers, Ex
barriers or the free end of the power
cable in potentially explosive
environments.
2. The classification of the installation site
must comply with the local rules.
3. On explosion-proof pumps, make sure
that an external ground conductor is
connected to the external ground
terminal on the pump by a secure
cable clamp. Clean the surface of the
external ground connection and mount
the cable clamp.
4. The ground conductor must be
minimum AWG 12 type RHH, RHW,
RHW-2 or similar, rated for 600 V and
minimum 90 °C, yellow and green.
5. Make sure that the ground conductor is
protected from corrosion.
6. Make sure that all protective
equipment has been connected
correctly.
7. Float switches used in potentially
explosive environments must be
approved for this application. They
must be connected to the Grundfos
Dedicated Controls, DC, DCD or the
SLC, DLC controllers, by an
intrinsically safe barrier to ensure a
safe circuit.
DANGER
Electric shock
Death or serious personal injury
‐ Unauthorised people must not have
any access to this product.
DANGER
Electric shock
Death or serious personal injury
‐ Before starting any work on the
product, make sure that the power
supply is switched off and that it cannot
be switched on unintentionally.
10
English (GB)