Grundfos SE1 50 Notice D'installation Et De Fonctionnement page 19

Do not install Grundfos 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.
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.
FM
The cross-section of the earth
conductor must be at least 0.0062 in2
(4 mm2), such as type H07 V2-K (PVT
90°) yellow and green.
Make sure that the earth connection is
protected from corrosion.
Make sure that all protective
equipment is connected correctly.
Float switches used in potentially
explosive environments must be
approved for this application. They
must be connected to the Grundfos LC
231 or LC 241 pump controller through
the intrinsically safe barrier to ensure a
safe circuit.
DANGER
Electric shock
Death or serious personal injury
‐
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. The
rated current is stated on the
nameplate.
If the pump has an FM mark on the
nameplate, make sure that the pump is
connected in accordance with the
instructions given in this manual.
The main supply voltage and frequency are
marked on the pump nameplate. The voltage
tolerance must be within ± 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 49 ft (15 m) cable and
a free cable end.
Pumps with sensor must be connected to a
Grundfos IO 113 and one of the following
controller type is recommended:
• a control box with a motor-protective circuit
breaker, such as a Grundfos CU 100
• a Grundfos LC 231 or LC 241 pump controller
• a Grundfos DC, DCD pump controller.
Before installation and the first startup
FM
of the pump, check the condition of the
cable to avoid short circuits.
6.1.3 Pumps with WIO sensor
CAUTION
Electric shock
Minor or moderate personal injury
‐
For safe installation and operation
of pumps equipped with a WIO
sensor, an RC filter is
recommended. If an RC filter is
installed to avoid any kind of
transient, the RC filter must be
installed between the power
connector and the pump.
The following may cause problems in case of
transients in the power supply system:
• Motor power:
- The bigger the motor, the higher the
transients.
• Length of the 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
increases 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 can 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.
Note: Soft starters and variable speed drives
have other Electro-Magnetic Compatibility (EMC)-
related issues that must be taken into
consideration.
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