Electrical Connection - Grundfos SL1 Instrucciones De Instalación Y Funcionamiento

8. Electrical connection

Warning
Connect the pump to an external mains switch
which ensures all-pole disconnection with a
contact separation according to National
Electrical Code and all local codes.
It must be possible to lock the mains switch in
position 0. Type and requirements as specified in
National Electrical Code and all local codes.
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
FM
Pumps for hazardous locations must be
connected to a control box with a motor
protection relay with IEC trip class 10.
See "Motor protection wiring diagram" on
page 17.
Warning
FM
Do not install Grundfos control boxes, pump
controllers, Ex barriers and the free end of the
power 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 on the pump using a secure cable
clamp. Clean the surface of the external earth
connection and mount the cable clamp.
The earth lead must be minimum AWG 12 type
RHH, RHW, RHW-2 or similar, rated for 600 V and
min. 194 °F (90 °C), 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 Dedicated Controls, DC or DCD, via an
intrinsically safe barrier to ensure a safe circuit.
Warning
If the supply cable is damaged, it must be
replaced by the manufacturer, its service agent or
similarly qualified persons.
Set the motor-protective circuit breaker to the
rated current of the pump + 15% Service factor.
Caution
The rated current is stated on the pump
nameplate.
If the pump has an Ex mark on the nameplate,
make sure that the pump is connected in
Caution
accordance with the instructions given in this
booklet.
14
The mains supply voltage and frequency are marked on the pump
nameplate. The voltage tolerance must be within - 10 %/+ 10 % of
the rated voltage. Make sure that the motor is suitable for the
power supply available at the installation site.
As standard, all pumps are supplied with 33 ft (10 m) cable and a
free cable end.
Pumps without sensor must be connected to:
• a control box with motor-protective circuit breaker, such as a
Grundfos DC, DCD pump controller
Pumps with sensor must be connected to:
• a Grundfos IO 111
• a control box with motor-protective circuit breaker, such as a
Grundfos DC, DCD pump controller
Warning
FM
Before installation and the first start-up of the
pump, check the condition of the cable visually to
avoid short circuits.