Electrical Connection; Operation With Frequency Converter; Startup And Operation - Calpeda NM Instructions Originales Pour L'utilisation

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
GB
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.
Use an eccentric transition piece to join the suction
connection with a horizontal pipe of larger diameter
(fig. 2).
Avoid formation of air pockets in suction pipe:
a) eccentric transition piece;
b) gate valve with horizontal handwheel;
c) pipe leading upwards.
Avoid trasmission of stress to the pump:
d) supports and anchoring of pipes.
Fig. 2 Connection of pipes.
With a pump located above the water level (suc-
tion lift operation), fit a foot valve with strainer
which must always remain immersed 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
Page 12 / 88
b a
c
d
marking.
Compare the frequency and mains voltage with
the name-plate data and connect the supply con-
ductors 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 11 TAB IEC 60335-1.
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-
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 NMM, are supplied with a capacitor
connected to the terminals and (for 220-240 V - 50
Hz) with an incorporated thermal protector.
4.93.040

6.6 Operation with frequency converter

Adjust the frequency converter so that the limiting
values of min. 25 Hz and max. f
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 the pump is located above the water level
(suction lift operation) fill the suction pipe and the
pump through the priming hole
Fig. 3 Filling.
NM, NMS, NM4, NMS4 Rev. 24 - Operating Instructions
Hz will not be
N
.
Fig. 3
4.93.141