Electrical Connection; Operation With Frequency Converter; Start-Up And Operation - Calpeda NR Instructions Pour L'utilisation

For installation in a position other than with a vertical
rotor axis, care must be taken to see that a drain
and condensation water hole is provided at the
lowest point of the motor.
Provide enough clearance around the unit for motor
ventilation, for inspections, to check the rotation of
the shaft and for filling and draining the pump.
6.4.1. Pipes
Ensure the insides of pipes are clean and unobstruc-
ted before connection.
ATTENTION: The pipes connected to the pump
should be secured to rest clamps so that they do
not transmit stress, strain or vibrations to the
pump.
The inside diameter of the pipe-work depends on the
desired flow.
Provide a diameter assuring a liquid flow not greater
than 1.5 m/s for suction and 3 m/s for delivery.
The pipe diameters must never be smaller than the
pump connection ports.
6.4.2. Suction pipe
The suction pipe must be perfectly airtight and be led
upwards in order to avoid air pockets.
With a pump located above the water level (suc-
tion lift operation), fit a foot valve or a check valve
on the suction connection.
With a pump located below water level (inflow
under positive suction head) install a gate valve.
6.4.3. Delivery pipe
Fit a gate valve in the delivery pipe to adjust delivery,
head, and absorbed power.
Install a pressure gauge.
With a geodetic head of over 15 m fit a check valve
between the pump and the gate valve in order to pro-
tect the pump from water hammering.

6.5 Electrical connection

OFF
Electrical connection must be carried out only
by a qualified electrician in accordance with
local regulations.
Follow all safety standards.
The unit must be properly earthed (grounded).
Connect the earthing (grounding) conductor to the
terminal with the marking.
Compare the frequency and mains voltage with the
name-plate data and connect the supply conductors
to the terminals in accordance with the appropriate
diagram inside the terminal box cover.
ATTENTION: with motor power rating ≥ 5.5 kW avoid
direct starting. Provide a control panel with star-
delta starting or an other starting device.
ATTENTION: never allow washers or other
metal parts to fall into the internal cable
opening between the terminal box and stator.
If this occurs, dismantle the motor to recover the
object which has fallen inside.
If the terminal box is provided with an inlet gland, use
a flexible power supply cord of the H07 RN-F type
with section of cable not less than (par. 12.5 TAB 1).
If the terminal box is provided with an inlet bushing,
connect the power supply cord through a conduit.
For use in swimming pools (not when persons are in
the pool), garden ponds and similar places, a resi-
NR(D), NR(D)4 Rev. 14 - Operating Instructions
dual current device with IΔN not exceeding 30 mA
must be installed in the supply circuit.
Install a device for disconnection from the mains
(switch) with a contact separation of at least 3 mm in all
poles.
With a three-phase motor install an overload protec-
tion device with curve D appropriate for the rated cur-
rent of the pump.
Single-phase NR(D)M, NR(D)4M, are supplied with
a capacitor connected to the terminals and (for 220-
240 V - 50 Hz) with an incorporated thermal protector.

6.6 Operation with frequency converter

Adjust the frequency converter so that the limiting
values of min. 25 Hz and max. fN Hz will not be
exceeded.
7 STARTUP AND OPERATION
7.1 Preliminary checks before start-up of the
pump
Do not start-up the device in case of damaged parts.
7.2 First starting
OFF
ATTENTION: never run the pump dry. Start the pump
after filling it completely with liquid.
When operating under a positive suction head, fill the
pump by opening the suction gate valve slowly and
completely, keeping the delivery gate valve and the
vent holes (14.42) open to release the air.
For water circulation in a closed circuit, open both
gate valves completely by releasing the air.
Check that the shaft turns by hand.
With a three-phase motor check that the direction
of rotation is as shown by the arrow on the pump,
otherwise disconnect electrical power and reverse
the connections of two phases.
With a suction lift operation it may be necessary to
wait a few minutes for the pump to prime.
Check that the pump works within its field of perfor-
mance, and that the absorbed current shown on the
name-plate is not exceeded.
Otherwise adjust the delivery gate valve.
Do not touch the fluid when its temperature
is higher than 50 °C.
Burn hazard. Due to high temperature of
the fluid, the pump casing and the motor
may reach temperatures higher than 50°C.
DO NOT TOUCH these parts unless with
suitable protective devices or wait and
make sure they have completely cooled.
7.2.1 First starting NRD, NRD4
Repeat this procedure for both pump units (paragraph
7.2).
After the start-up procedure, check that:
- The pump unit in use and the one in standby must
alternate regularly to ensure even distribution of the
hours of operation: make the change manually or
install an automatic controller
- When pumping domestic hot water, the pump units
should alternate at least once a day to prevent any
deposits from clogging the pump unit on standby.
EN
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