WIRING DIAGRAMS
Motive three phase motors can be connected "Star" or "Delta".

STAR CONNECTION
Star connection is obtained by connecting together the terminals W2, U2, V2 and supplying the terminals U1, V1, W1.
The phase current and voltage are respectively:
Iph = In
Uph = Un / 3 -2
where In is the supply line current and Un is the supply line voltage of Star connection

The following voltages and frequencies are inside the standard power supply of all three-phase motive motors, under S1 duty service:

  Volts
Size Hz collegamento a triangolo collegamento a stella
56-132 50
± 5%		 230 400
220 380
240 415
60
± 5%		 260 440
220 380
265 460
280 480
 
132-355 50
± 5%		 400 690
380 660
415 720
60
± 5%		 440 760
380 660
460 795
480 830


targa motore
DELTA CONNECTION
Delta connection is obtained by connecting the end of a phase with the beginning of the following one.
The phase current Iph and the phase voltage Uph are repectively:
Iph = In / 3 -2
Uph = Un
where In and Un are referred to Delta connection.

MOTIVE MOTORS PROTECTION

protections must be chosen based on the specific running conditions, according to standards EN 60204-1.
Protection for motors with a shaft power greater than or equal to 0.5 kW with continuous S1 service. This protection may be achieved by means of a thermal cut-out relay, which automatically control a knife switch.
protection against peak currents by magnetic relay that controls an automatic knife switch, or by fuses; these must be set to the locked rotor current.
if the application requires, protection against excessive speed of the electric, for example if the mechanical load may drive the electric motor itself and thereby create a hazardous situation.
If special conditions or synchronised operation with other machines or parts of machines require it, protection against power failures or dips by means of a minimum voltage relay that controls an automatic power knife switch.

The electrical protections on the motor power line may not be sufficient to protect against overloads. If the cooling conditions worsen, the motor overheats but the electrical conditions do not change, which inhibits line protections. Installing built-in protections on the windings solves this problem:
PTO bimetallic device
this is a normally-closed electromechanical device that opens electrically when the threshold temperature is reached; it automatically resets when the temperature falls below the threshold level. Bimetallic devices are available with various intervention temperatures and without automatic reset, per EN 60204-1.
PTC thermistor device
this device promptly, positively adjusts its resistance once the threshold temperature is reached. motive motors from type 160 to type 355L are equipped with 3 PTC thermistors in the winding, with temperature intervention of 150°C in Class F motors (standard), or 180°C in H Class motors.
PT100 device
this is a device that continuously, increasingly adjusts its resistance according to the temperature. It is useful for constant measuring of the winding temperatures using electronic equipment.