Grundfos SL1.100.100.40.4, Installation And Operating Instructions Manual

Page: 17 / 56

English (GB)
17
8. Electrical connection
The 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.
All pumps are supplied with 10 m cable and a free cable end,
except for pumps for Australia which have 15 m cable.
Pumps without sensor must be connected to one of these two
controller types:
• a control box with motor-protective circuit breaker, such as a
Grundfos CU 100 control box
• a Grundfos LC, LCD 107, LC, LCD 108 or LC, LCD 110 pump
controller.
Pumps with sensor must be connected to a Grundfos IO 111
and one of these two controller types:
• a control box with motor-protective circuit breaker, such as a
Grundfos CU 100 control box
• a Grundfos LC, LCD 107, LC, LCD 108 or LC, LCD 110 pump
controller.
Pumps with WIO sensor
For safe installation and operation of pumps equipped with a WIO
sensor, we recommend to install an RC filter between the power
contactor and the pump.
Please note that the following aspects may cause problems in
case of transients in the power supply system:
• Motor power:
– The bigger the motor, the higher the transients.
• Length of motor cable:
– Where power and signal conductors are running in parallel
close to each other, the risk of transients causing
interference between power and signal conductors will
increase with the length of the cable.
• Switchboard layout:
– Power and signal conductors must be physically separated
as much as possible. Close installation can cause
interference in case of transients.
• Supply network "stiffness":
– If a transformer station is located close to the installation,
the supply network may be "stiff" and transient levels will be
higher.
If combinations of the above aspects are present, it may be
necessary to install RC filters for pumps with WIO sensors to
protect against transients.
Transients can be completely eliminated if soft starters are used.
But be aware that soft starters and variable speed drives have
other EMC-related issues that must be taken into consideration.
For more information, see section
8.8 Frequency converter
operation
Warning
The pump must not run dry.
An additional level switch must be installed to
ensure that the pump is stopped in case the stop
level switch is not operating.
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 IEC trip class
10 or 15.
Warning
Pumps for hazardous locations must be
connected to a control box with a motor
protection relay with IEC trip class 10.
Warning
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 conductor 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 cross section of the earth conductor must be
at least 4 mm
2
, e.g. type H07 V2-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.
Warning
If the supply cable is damaged, it must be
replaced by the manufacturer, its service agent or
similarly qualified persons.
Caution
Set the motor-protective circuit breaker to the
rated current of the pump. The rated current is
stated on the pump nameplate.
Caution
If the pump has an Ex mark on the nameplate,
make sure that the pump is connected in
accordance with the instructions given in this
booklet.
Warning
Before installation and the first start-up of the
pump, check the condition of the cable visually to
avoid short circuits.
Caution
If an RC filter is installed to avoid any kind of
transients in the installation, the RC filter must be
installed between the power contactor and the
pump.