1. Non è ammesso intervenire sui pressacavi o aprire la carcassa motore se non da parte di officine autorizzate Caprari.
2. Le caratteristiche di funzionamento di queste macchine devono essere conformi alle caratteristiche riportate in targa e nel certificato EX allegato.
3. La quota di minimo battente è alla sommità del motore elettrico per le macchine funzionanti in servizio S1; sopra il corpo pompa per le elettropompe previste per funzionamento con servizio intermittente S3
4. E' obbligatorio collegare le sonde termiche all’apparecchiatura di comando dell’elettropompa. L’intervento della sonda termica deve interrompere l’alimentazione dell’elettropompa. Il ripristino non deve essere automatico, ma deve avvenire solo dopo un controllo da parte di personale qualificato.
5. Non è ammesso apportare modifiche alle macchine o sostituire particolari nei motori elettrici. E' ammesso sostituire unicamente particolari della parte idraulica con particolari originali identici (stesso codice o stessa sigla riportata sul particolare) in presenza di normale usura per funzionamento. Interventi diversi dalla manutenzione ordinaria possono essere eseguiti unicamente dalla Caprari S.p.A.
6. L’uso, facoltativo, del sensore di conduttività inserito nella carcassa motore, è subordinato all’ impiego di un dispositivo di comando inserito nel quadro e conforme alle previsioni dell’ ambiente potenzialmente esplosivo.”
7. I seguenti malfunzionamenti possono essere fonti di innesco di esplosione; attivare pertanto tutti i possibili accorgimenti atti ad evitarli:
   - funzionamento senza liquido nella pompa oppure a portata nulla: prevedere quindi idonei dispositivi di controllo con intervento diretto sul quadro ed a riarmo manuale
   - avaria ai cuscinetti dell’albero pompa: in caso di un aumento delle vibrazioni e/o della rumorosità di funzionamento arrestare la pompa ed inviare la stessa alle officine autorizzate Caprari
8. Funzionamento con inverter/converter:
   l’uso di questa apparecchiatura elettronica di comando e regolazione deve essere studiato con la massima attenzione per verificare che non generi disturbi elettromagnetici o correnti indotte disperse che diminuiscano lo standard di sicurezza richiesto dalla classificazione ATEX della zona in cui operano le apparecchiature. Devono essere in ogni caso rispettate le seguenti condizioni
   - è obbligatorio l’uso di inverters Danfoss della serie VLT FC202 o modelli Danfoss di più recente costruzione con caratteristiche prestazionali migliorative; l'uso di modelli corrispondenti di altre marche devono essere autorizzati dalla Caprari S.p.A.;
   - è obbligatorio impostare la frequenza di commutazione interna dell’inverter a non più di 4kHz o alla minima frequenza ammessa dall’inverter;
   - è obbligatorio dotare l’inverter di opportuni filtri di riduzione del [dv/dt] interposti fra l’inverter ed il motore;
   - è obbligatorio utilizzare l’inverter nel solo campo di modulazione 35 - 60 Hz.
9. La temperatura standard max ambiente è di 40°C, su richiesta, a seguito verifica Caprari S.p.A., si può accettare un temperatura ambiente massima fino a 60°C, temperatura che verrà riportata in targa elettropompa.
   
    

Absorption differences on the three motor phases (greater if detected without load) are not always due to a construction defect since even the supply can be unbalanced.
If a high imbalance is detected (under optimal voltage conditions) also check absorption on the other two motor/mains connection combinations; (to maintain the same rotation direction, proceed according to the diagram):
Optimal connection is when the difference between absorptions is the least. 
However, if the highest absorption is always detected on the same phase of the line the main cause of imbalance is due to the supply.
N.B.: Max. permissible imbalance on absorbed current: 5%.

The maximum temperature of the pumped liquid is 40° C.

A density higher than 1 Kg/dm 3 and/or viscosity higher than 1 mm 2 /s inevitably involves an increase of power absorbed by the motor, with subsequent overheating and burning of the winding if there are no thermal protectors. 
Possible suggestions:
Use a motor of higher power: the percentage increase in motor power must be at least equal to the density percentage. 
Use of an impeller of smaller diameter than standard.
To avoid possible obstructions and clogging, it is advisable to check that the velocity of the liquid in the delivery piping stays above 0.8-1 m/s. In the presence of sand, at least 1.6 m/s is required in the horizontal piping and 2.5 m/s in the vertical.

The minimum level of fluid required for a submersible electric pump immersed in that fluid differs, depending on the type of service (A1=continuous service/S3=intermittent service). This is why it is pre-engineered for installation of a cooling casing if required.
INSTALLATION WITHOUT THE COOLING CASING:
S1 operation: the motor must be completely immersed in the pumped fluid. 
S3 operation: the fluid can reach the base of the motor. However, the electric pump can only operate in these conditions for a certain period, alternated by the period at a standstill required by the motor.
OPERATION WITH THE COOLING CASING: The motor can operate completely uncovered by the fluid in the S1 service mode.

The phenomenon of cavitation is due to the formation and subsequent implosion of vapour bubbles forming inside the impeller blades due to an internal pressure lower than the vapour pressure of the pumped liquid at a given temperature.
With waste water electric pumps cavitation can occur for the following reasons:

• Suction pipe too long (only in the case of installations in dry chamber)
• Intake of small quantities of air bubbles due to the creation of vortices caused by the dynamic level lower than m…
• If the effective work duty point goes outside the normal electric pump utilization field
• Water based liquids with temperatures above 80°C. 
  N.B.:  Cavitation can cause the following malfunctions:
• Changes in hydraulic performance
• Excessive noise (rattling)
• Violent vibrations with possible failure of seals, bearings and the shaft

Standard submersed motors can also be used with multi-frequency starters. 
The use and maintenance manual of the electric pump gives instructions that must be complied with if an Inverter or Soft-starter is used.
General instructions for use of the INVERTER:
- the minimum frequency must not be less than 70% of the rated value during the starting phase and/or use, with the voltage/frequency ratio maintained at a constant level. 
A filter that ensures the following voltage gradient must be installed between the inverter and motor: 
- (dV / dt) ≤ 750 V/µs for motors in oil
- (dV / dt) ≤ 500 V/µs for motors in water and propylene glycol with standard winding and well tmax C ° ≤ 25 °C 
- (dV / dt) ≤ 650 V/µs for motors in water and propylene glycol with special winding and well tmax C ° ≤ 35 ° 
- 
<= 1.5% harmonic voltage content. 
<= 4 % harmonic current content.
Conditions to be complied with regardless of the length of the power cables.

General instructions for use of the SOFT-STARTER:
The SOFT-STARTER device must be the voltage ramp and not the current ramp type.
- always make sure that the soft-starter is cut out once the starting phase of the assembly has terminated.
If an installation with a soft-starter or inverter starting system functions in a faulty way, check the operation of the electric pump assembly by connecting it straight to the electricity main (or to another device).

The possibility of coupling using adapters with the main coupling supports in production is provided for. 

The terminals of the power cable are marked with the IEC international codes. Their correct connection to the L1(u), L2(v), L3(w) line ensures that the electric pump turns in the right direction. The arrow on the casting on the top part of the motor indicates the correct direction of rotation, i.e. clockwise viewed from above. If the installed unit is visible when started, it will be subjected to kick-back in the anti-clockwise direction.
If it is impossible to directly check the direction of rotation (e.g.: when the electric pump is already installed), it is advisable to compare the hydraulic performance parameters and the motor’s electric power input with the electric pump’s data plate values.
Switch two of the phases with each other to invert the sense of rotation.

If the Caprari electrical panel, already arranged for sensor connection, is not available, it is possible to ask the sales network for the appropriate CLM/3S-24V motor oil chamber water detection sensors.

The conductivity sensor is inserted in the oil chamber and detects any water infiltration in the chamber from the mechanical seal. If the electrical panel has a detection device just connect the terminal with the "S" symbol and a branch of the yellow/green earth wire.
The conductivity detection device is used to activate an alarm circuit in the event water is detected in the oil.
The alarm can be either visual or audible. For explosion proof motors the devices used must be intrinsically safe and compatible with the zone classification in which they are in use.
 

In normal operating conditions the oil must be changed every 10000/15000 hours.
Use SAE 10W oil. If there is water in the oil, check the condition of the pump side mechanical seal and replace it if necessary.

The heat sensor terminals, marked with the symbols T1 and T2, must be connected in series to the electric pump command remote control switch coil (see the general cable wiring diagram in the operator's manual). The heat sensors are normally closed bimetal switches embedded in the motor windings. When the temperature of 132°C is exceeded they open, breaking the remote control switch coil feed circuit and causing the electric pump to stop.
The coil is excited again when the sensors have cooled (114°C). The sensors can be connected with a max. of 250V. A power supply of 24V – 1.5°? is recommended.
For pumps with explosion proof motors  (type ..X.. ) the connection of the temperature 
probes is compulsory.  Failure to do so will invalidate the warranty.

All the paints used have certification of suitability for contact with drinking water.
Upon request the pump oil chamber, normally filled with mineral oil - viscosity SAE 10W, can be filled with dielectric oil approved by the Food and Drug Administration (U.S.A.) and suitable for contact with food substances.