Electrical Connection; Maintenance - Calpeda MXS 3 Originalbetriebsanleitung

The pump can be held in a suspended position by
the metal delivery pipe. Tighten the threaded pipe
joints firmly to avoid loosening during operation.
Position the pump at a distance of at least 0.5 m
from the bottom of a well so that sand is not lifted.
A safety rope or chain of non-perishable material
should always be used to secure a suspended pump.
When a plastic or flexible delivery pipe is used,
the safety rope or chain should be utilized for low-
ering, securing and raising the pump.
Never use the electric power cable to
suspend the pump.
Attach the power supply cable to the delivery pipe
and to the safety rope with cable clamps at inter-
vals of about 3 m. The power cable should not be
taut: allow for a certain degree of slackness
between the clamps to avoid the risk of strain
caused by expansion of the pipe during operation.

3. Electrical connection

Electrical connection must be carried out
only by a qualified electrician in accor-
dance with local regulations.
Follow all safety standards.
The unit must be always earthed, also with a
non-metallic delivery pipe.
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 I∆N 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 .
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 capacitor and thermal
protector, with plug.
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Connect the plug to a socket with an earth lead.
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.
Electrical diagram pag. 40.
3.2. Three-phase pumps MXS
Install with a control box and 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.
To check this close the discharge valve and mea-
sure the closed valve pressure with a pressure
gauge mounted between the valve and the pump
discharge, or visually check the flow-rate.
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 discharge 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.
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