Grundfos SE - Electrical Connection

5. Electrical connection
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.
DANGER
Electric shock
Death or serious personal injury
‐ The pump must be grounded. Before
connecting the pump to the voltage
supply, make sure the connection to
ground complies withthe local
regulations.
Connect the pump to an external main
switch ensuring all-pole disconnection with
a contact separation according to EN
60204-1, 5.3.2. It must be possible to lock
the main switch in position 0.
The supply voltage and frequency are
marked on the nameplate. Make sure that
the motor is suitable for the power supply
at the installation site.
The electrical connection must comply with
the local regulations.
Connect the pumps to a controller with a
motor protection relay with IEC trip class
10 or 15 or NEMA-equivalent.
The power supply for the motor protection
circuit must be low voltage, class 2.
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.
If the power cable is damaged, it must be
replaced by the manufacturer or his
service agent.
Connect the pump to a motor-protective circuit
breaker.
Set the motor-protective circuit breaker to
the rated current of the pump +15 %
service factor. The rated current is stated
on the nameplate.
The supply voltage and frequency are marked on the
nameplate.
The voltage tolerance at the motor terminals must be
within ± 10 % of the rated voltage.
The motor is effectively grounded with the power
cable and pipes. The motor top cover is equipped
with connections for external grounding or an
equipotential bonding conductor.
Maintenance and service work on
explosion-proof pumps must be carried out
by Grundfos or an authorised service
workshop.
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English (GB)