Preliminary Inspections; Electrical Connections - caprari K+ Serie Instrucciones De Servicio

K.M150R.. / K.250... / K.D300... / K.D350...

17. PRELIMINARY INSPECTIONS

ATTENTION The electric pump may only be installed after a few simple inspections have been made.
1. The electric pump is supplied ready for use with the correct amount of oil. After a long period at a standstill, check that there is the right quantity of
oil in the "oil chamber" (consult the relative "OIL CHANGE" paragraph.
2. Check that the rotor is free to turn by working on the impeller through the suction mouth.
3. Connect the powering cables to the Control Panel (see paragraph 18).
The terminals of the power cable are marked with international IEC codes. The electric pump will only turn in the right direction if the terminals are
GB
correctly connected to the L1(u1-w2), L2(v1-u2), L3(w1-v2) line. If the installed unit is visible during the starting phase, it will be subjected to a kick-
back in an anti-clockwise direction (see Fig. 6).

18. ELECTRICAL CONNECTIONS

Make sure that the electric control panel corresponds to the national standards currently in force.
Particularly make sure that its protection degree suits the installation site. It is advisable to install the electrical equipment in a dry place. Failing this,
special versions of the equipment should be used.
ATTENTION The contacts of under-sized or poor quality electrical equipment will quickly deteriorate. This will lead to an unbalanced power supply
for the motor which could damage it.
Safe and reliable operation can only be ensured if good quality equipment is installed.
1) a main knife switch with a gap of at least 3 mm between its contacts and an appropriate device to lock it in the open position;
2) a suitable thermic motor protector device calibrated for a maximum power draw no higher than 5% of the current rating indicated on the motor
data plate and with an activation time of less than 30 seconds;
3) a suitable magnetic device to protect the cables against short-circuits;
4) a suitable device to protect the electric pump against earth faults;
5) a suitable phase failure protection device;
6) a device to protect against dry runs;
7) a voltmeter and an amperometer.
The engineer who designs the plant must make sure that the power supply system is protected against unwanted and accidental start-ups due to
national rules of installation (Italy CEI 64-8) and according to the wiring diagrams enclosed with the control panels.
Check that the voltage and frequency values on the electric pump data plate correspond to those of the electricity main.
ATTENTION
have been reversed. In electric pumps with channel impellers, this would overload the motor and subject it to heavy vibrations
Check the power draw on each phase. Unbalances must not exceed 5%. Higher values could be caused by the motor or the electricity main. Check the
power drawn in the other two motor-main combinations, working with double phase connection changes in order to maintain the same rotation direction.
The optimum connection is that with the least power draw difference per phase. Note that if the higher power draw is always on
phase, the main cause of this unbalance will be due to the power supply.
Unless it is correctly researched and implemented, use of the INVERTER and SOFT-STARTER can damage the pumping unit. Ask for assistance from
Make sure that the cable clamp is tightened. In case, for any reason whatsoever, the cable comes free from cable gland, replace
If the sheath comes off the cable, check that the joint between the two ends is perfectly insulated and protected against the damp.
The free ends of the cable must never be immersed or wetted in some way. Protect them against water absorption if necessary.
If the power cable breaks, ask for a genuine Caprari spare, complete with cable clamp, specifying the serial number of the electric pump and the number
inferior to those of the standard cable (contact Caprari S.p.a. and check the type of standard cable used in the sales catalogue).
General prescriptions for the use of the INVERTER
- During commissioning and/or use, the minimum frequency must not be lower than 30 Hz, with a steady voltage to frequency ratio
- Maximum acceleration ramp time - 3 seconds
- Maximum deceleration time equal to twice the maximum acceleration time.
Ensure the following operating conditions:
750
Voltage gradient
Conditions that must be met regardless of the length of the power cables.
General prescriptions for the use of the SOFT STARTER:
- The SOFT STARTER device must carry out a voltage ramp starting or a constant current starting
- The SOFT STARTER device must not carry out a current ramp starting or a torque ramp starting
- Minimum peak current Vs = 60% Vn
- Minimum peak current Is = 400% In
- Maximum acceleration ramp time - 3 seconds
- Maximum deceleration time equal to twice the maximum acceleration time
- Deceleration method either by freewheel or by voltage ramp, not by braking
- Always make sure that the soft-starter is off once the assembly start phase has completed.
assembly by connecting it directly to the grid (or with another device).
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1000 V
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the same line
Caprari S.p.A.