Ground Connection; Motor Protector Connections; 20. Preventive Maintenance Inspections; Oil And Grease Inspection And Change - caprari K+ Serie Instrucciones De Servicio

18. GROUND CONDUCTOR CONNECTIONS
The Yellow/Green ground terminal in the electric pump cable must be connected to the grounding circuit of the system before the
other terminals are connected. Furthermore, it must be the last terminal to be disconnected if the electric pump is disconnected.
There is an additional external terminal near the cable clamp for flameproof versions of the electric pumps. Connection of this
terminal with the grounding circuit of the system is at the installer's charge.
19.

MOTOR PROTECTOR CONNECTIONS

19.1.
THERMAL PROBES (standard supply on version K...+...X... only)
ATTENTION All electric pumps are equipped with thermal probes as standard supply (terminals marked with symbols T1 and T2). It
is obligatory to connect them to a suitable power source cut-out device with manual reset.
Thermal probes are normally closed bimetallic switches installed in the motor windings. Once a temperature of 132°C (270°F)
has been exceeded, the switches open and interrupt the power supply to the remote control coil, thus stopping the electric
pump.The coil will be energized again when the probes have cooled (114°C/237°F).
The probes can be connected at a max. voltage value of 250V and have a max. capacity of 1,6A cosϕ = 0.6.A 24V - 1.5A power
supply is recommended.
19.2 CONDUCTIVITY PROBE (standard supply on version K...+...X... only)
WARNING All the explosion-proof electric pumps are equipped with conductivity probes. The probe detects water infiltrations in the motor casing.
The terminals of the probe circuit are the conductor bearing the "S" symbol and a shunt from the Yellow/Green earth conductor. If the electric panel
is equipped with the relative device, this will activate when the electric resistance of the circuit drops to below 30kΩ owing to the presence of water.
The conductivity detector is generally used to close an alarm circuit (lights and/or acoustic) if water is detected near the probe.
When explosion-proof electric pumps are installed in sites classified as places where explosions could occur, probe
use requires installation of a protected intrinsic safety circuit using type "i" safety equipment with galvanic
separation, certified in compliance with EN-50.014 and EN-50.020 standards (see paragraph 7.7).

20. PREVENTIVE MAINTENANCE INSPECTIONS

To ensure regular pump operation and long life, the purchaser must ensure that regular inspections and periodic maintenance operations are carried
out, with replacement of any worn parts. It is advisable to carry out the below listed preventive inspections at least once a month, or after every 200-
300 hours service:
- check that the power supply voltage is within the established values;
- check that the noise and vibration levels are unchanged, in relation to optimum first start-up conditions;
- using an amperometric clamp, check that the power draws on the three phases are balanced and that they do not exceed the data plate values;
- check the motor insulation: detach the power cable from the panel and connect the joined cable terminals and the ground cable to the terminals of
a 500 V.d.c. ohmmeter. The insulation resistance (motor-cable) must not be less than 5MΩ. Failing this, pull out the unit and overhaul (a cable will
need replacing or the motor must be repaired). Further inspections for electric pumps equipped with the following devices:
- check the oil conductivity which must be >30KW, if the electric panel is without the relative warning light;
- check the specific warning light to see whether the thermal probes of the motor have activated.
Ask Caprari SpA for their "Periodic inspections and preventive maintenance" publication, document N° 0023450 for more detailed and scheduled
maintenance work.
21.

OIL AND GREASE INSPECTION AND CHANGE

In normal conditions of work, the oil must be changed every 7500 hours and every 2500 hours in heavy duty situations. Use the oils listed
below or similar ones.
Use the relative opening with plug on the pump casing opposite the delivery inlet when emptying and filling with oil. To ensure complete
emptying, the machine should be set in a horizontal position. If the drained oil is like an emulsion, change it for new oil and check the condition
of the seal on the pump side.
Change the mechanical seal on the pump side if there is water together with the oil in the reservoir. The mechanical seal on the motor side
should only be replaced if it is damaged or if there is fluid in the motor compartment.
When the electric pump is installed in a horizontal position, correct oil filling is obtained by adding the below indicated quantities:
Electric pump type
K _ _ 065 F _ _
K _ T 040 F _
To correctly fill, it is very important to comply with the indicated oil quantity. The oil reservoir has been designed to ensure an adequate air cushion.
Once the emptying/filling operations have been completed, check that the plug is well tightened and equipped with a new copper seal. If the oil has been
changed, do not throw the old oil away. Give it to those companies authorized for oil disposal (apply to the relative COBAT Obligatory Consortia in Italy).
Bearings must be lubricated with lithium grease type ESSO - UNIREX - N3 or equivalent filled at 70% only in case of bearing replacement or electric
pump repair.
In case the lower mechanical seal undergoes a failure, an oil emission in the pumping fluid may happen.The safety card
concerning the oils used by Caprari can be required directly to Caprari S.p.A.The oil filling provided of F.D.A. certification
can be even asked to Caprari S.p.A.
Caprari S.p.A.
Oil type Quantity in [kg]
ISO32 - SAE 10 W
- ARNICA 32 -AGIP
- DTE24 -MOBIL
- NUTO H32 -ESSO
- TELLUS S37 -SHELL
OR ANALOGOUS
K..065F.. / K.T040F..
Quantity in [l]
0,74
0,82
0,40
0,48
GB
25