Electrical Connection; Operation With Frequency Converter; Startup And Operation - Calpeda NM Instrucciones De Uso

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).
EN
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.
6.4.4 Alignment of pump-motor unit
ATTENTION: a misalignment between pump
feet and motor feet could cause vibration and
early wear of elastic bearings, the seal and
other internal parts.
Make sure the rotor turns freely when moved by
hand. Insert 1 mm thickness under the feet of the
pump casing, then thicken the motor until alignment
is obtained. For adjustment loosen or remove the
screws where necessary and add calibrated plates
under the motor feet if necessary.

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
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-
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b a
c
d
marking.
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. 13.3 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-
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-
4.93.040
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.

6.6 Operation with frequency converter

Adjust the frequency converter so that the limiting
values of min. 25 Hz and max. nominal frequency 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 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.
When the liquid level on the suction side is above
the pump (inflow under positive suction head), fill
the pump by opening the suction gate valve slowly
and completely, keeping the delivery gate valve open
to release 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
casing, otherwise, disconnect electrical power and
reverse the connections of two phases.
With a suction lift operation it may be necessary to
NM, NMS, NM4, NMS4 Rev. 28 - Operating Instructions
.
Fig. 3
4.93.141