Electrical Requirements; Install The Pump; Mechanical Installation - Lowara e-NSC Serie Manual De Instrucciones

en - Original instructions
valve) for regulation of the pump capacity, for
pump inspection, and for maintenance.
• In order to prevent back flow into the pump when
pump is turned off a check valve is installed on
the delivery piping.
WARNING:
Do not use the on-off valve on the dis-
charge side in the closed position in or-
der to throttle the pump for more than a
few seconds. If the pump must operate
with the discharge side closed for more
than a few seconds, a bypass circuit
must be installed to prevent overheating
of the liquid inside the pump.
For illustrations that show the piping requirements,
see Figure 12 and Figure 13

4.2 Electrical requirements

• The local regulations in force overrule these
specified requirements.
• In the case of fire fighting systems (hydrants
and/or sprinklers), check the local regulations in
force.
Electrical connection checklist
Check that the following requirements are met:
• The electrical leads are protected from high tem-
perature, vibrations, and collisions.
• The power supply line is provided with:
• A short-circuit protection device
• A mains isolator switch with a contact gap of
at least 3 mm
The electrical control panel checklist
NOTICE:
The control panel must match the ratings of the elec-
tric pump. Improper combinations could fail to guar-
antee the protection of the motor.
Check that the following requirements are met:
• The control panel must protect the motor against
overload and short-circuit.
• Install the correct overload protection (thermal re-
lay or motor protector).
Pump Type
Single phase standard
electric pump ≤ 2.2 kW
Three phase electric
4
pump
3
fuses aM (motor starting), or magneto-thermal switch with curve C and Icn ≥ 4,5 kA or other equivalent device.
4
Overload thermal relay with operation class 10A + fuses aM (motor starting) or motor protection magneto-thermal switch
with operation class 10A.
20
.
Protection
• Built-in automatic
reset thermal-am-
perometric protec-
tion (motor protec-
tor)
• Short circuit protec-
tion (must be sup-
plied by the instal-
3
ler)
• Thermal protection
(must be supplied
by the installer)
• Short circuit protec-
tion (must be sup-
Pump Type
• The control panel must be equipped with a dry-
running protection system to which a pressure
switch, float switch, probes, or other suitable de-
vice is connected.
• The following devices are recommended for use
on the suction side of the pump:
• When the liquid is pumped from a water sys-
tem, use a pressure switch.
• When the liquid is pumped from a storage
tank or reservoir, use a float switch or probes.
• When thermal relays are used, relays that are
sensitive to phase failure are recommended.
The motor checklist
WARNING:
• Read the operating instructions in or-
der to ensure whether a protection
device is provided if another motor
other than the standard is used.
• If the motor is equipped with automat-
ic thermal protectors, be aware of the
risk of unexpected starts in connec-
tion to overload. Do not use such mo-
tors for fire-fighting applications.
NOTICE:
• Only use dynamically balanced motors with a
half-sized key in the shaft extension (IEC
60034-14) and with normal vibration rate (N).
• The mains voltage and frequency must agree
with the specifications on the data plate.
• Only use single-phase or three-phase motors
whose size and power comply with the European
standards.
In general, motors can operate under the following
mains voltage tolerances:
Frequency Hz Phase ~
50
60
Use cable according to rules with 3 leads (2+earth/
ground) for single phase versions and with 4 leads
(3+earth/ground) for three phase version.

4.3 Install the pump

4.3.1 Mechanical installation

Check the following before installation:
Protection
plied by the instal-
ler)
UN [V] ± %
1 220 – 240 ± 6
3 230/400 ± 10
400/690 ± 10
1 220 – 230 ± 6
3 220/380 ± 5
380/660 ± 10