Calpeda MXS Serie Instrucciones Originales De Uso página 6

ATTENTION: in the case of water containing
chloride (or salt water), the earthing (grounding)
conductor is useful also to reduce the risk of
galvanic corrosion due to electrolytic action,
especially with non-metallic delivery pipe and
safety rope.
Make sure the frequency and mains voltage cor-
respond with the name plate data.
For use in swimming pools (not when people are
in the pool), garden ponds and similar places, a
residual 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 on all poles.
When the water level is not under direct visible
control, install a float switch or electrodes to protect
the pump against dry running and to set the water
levels to stop and automatically start the pump.
The pumps are supplied with power cable type
H07 RN8-F, 4G1 mm
When extension cables are used, make sure the
cable wires are of adequate size to avoid voltage
drops. For connection of cables in a well, use
thermo-shrinking sheathes or other methods for
submersed cables.
3.1. Single-phase pumps MXSM
Supplied with incorporated thermal protector.
The motor will stop if overheating is detected.
When the windings cool down (after 2 to 4 min-
utes), the thermal protector enables re-starting.
Control box with starting capacitor is included in
the scope of supply.
MXSM
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Electrical diagram
4.93.002/1N
3.2. Three-phase pumps MXS
Install in the control box an overload-protective
device in accordance with the name-plate current.
4. Starting
With a three-phase power supply make sure
the direction of rotation is correct.
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MXSM....CG
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For this purpose, with the gate valve at any aperture
position, check the pressure (with the pressure
gauge), or flow rate (sight check) after starting.
Switch off power, invert the connections of two
phases on the control panel, re-start and check the
pressure or flow rate capacity again.
The correct direction of rotation will provide a con-
siderably greater and easily distinguishable pres-
sure and delivery capacity.
Make sure the pump is operating within its range of
rated performance and that the absorbed current
indicated on the name-plate is not exceeded.
Otherwise, adjust the delivery gate valve or the set-
ting of pressure switches if installed.
ATTENTION: never allow the pump to run for
more than five minutes with a closed gate valve.
ATTENTION: never run the pump dry, not even
for a short trial run.
Never start the pump before it has been immersed
to a depth of at least 100 mm.
Construction with float switch:
the float switch, connected directly to the pump,
controls starting and stopping.
Check that the float switch is free from any obstacle.
If necessary, adjust the float-switch cable.
Execessive cable length may cause the motor to
overheat and the pump to run dry.
Construction without float switch:
If there is no air vent valve in systems with a check
valve, the minimum immersion depth at first start-up
must be 300 mm. An air vent valve must be used in
systems with an immersed delivery outlet.
Do not start the pump with a completely closed shut-
off gate valve.
Never take the pump out of the water while the
pump is still operating.
5. Maintenance
Under normal operating conditions the pump will
not require maintenance.
If freezing may be expected while the pump re-
mains inactive and it is not submersed at a safe
depth, remove the pump from the water and leave
it in a dry place.
ATTENTION: if the pump is temporarily used
with dirty liquids or water containing chlori-
de, flush the pump briefly with clean water im-
mediately after use to remove any deposit.
4.93.002/1N
If the pump has not been used for a long time and
does not start or gives no water (but electrical
connections are in order), the pump must be
removed from the water and checked to see if it is
choked by any foreign matter or blocked by sedi-
ment, deposits or any other cause.
Disconnect electrical power before
any servicing operation and make
sure the pump cannot be acci-
dentally switched on.