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OMEC MOTORS

 

 

OMT1 & OMT2 Mounting & Maintenance Instructions

 

 

Page 7 

 

 

 
5.2.

 

Circuit  

 

Normally our motors are provided with a terminal box with six connections, to which six 
leads from the winding are connected either in a delta connection or in a star connection 
by means of connection links.  

 

Usually two voltages are indicated on the nameplate of these motors, which means that 
the motor can be connected to a circuit having one of these voltages.  

 

If the main voltage is corresponding with the lowest indicated voltage, the winding has to 
be connected in delta connection (see figure 1); if it is corresponding with the highest 
indicated voltage, the winding has to be connected in star connection (see figure 2).  

 

A motor with e.g. 230/400V on its rating– plate is suited to be switched on directly, on a 
circuit with a voltage of 230V between phases with the winding connected in a delta 
connection, or on a circuit with a voltage of 400V with the winding connected in a star 
connection.  

 

But if the motor is switched on with a star– delta starter the motor is only suited for a 
main voltage on the rating-plate, this is the delta voltage. In this case, the connection 
strips on the terminal box have to be removed when the motor is connected; the star and 
delta connection will be made successively in the starter during the run up. If only one 
voltage is indicated on the rating– plate together with the delta sign, the motor can be 
switched on directly at the indicated voltage or with a star/delta start.  

 

Pole change motors (for two or more speeds) are connected according to a diagram sent 
together with the motor.  
 
 
 

Summary of Contents for OMT1

Page 1: ...ntents page 1 General information 2 2 Delivery 2 3 Mounting 2 4 Coupling 3 5 Electrician connection 6 6 Connection diagram 8 7 Putting into service 9 8 Maintenance 9 9 Bearing types 12 10 Bearing grea...

Page 2: ...photos to the supplier You should be able to rotate the shaft easily and smoothly with the hand Compare the details on the nameplate with those of the power network and with the requirements of the mo...

Page 3: ...1 Direct coupling The motor and the driven machine must be mounted in one line to avoid tension on the shaft Bad alignment can be a major source of noise and vibrations We do not recommend using soli...

Page 4: ...mall or too wide or too high a tension on the belt may damage the bearing or cause a shaft break In case of doubt consult the supplier Spur Gear Drives The motor and the driven machine have to be posi...

Page 5: ...ension and the tolerances of the shaft extension and the key are indicated on the motor dimension sheet Assembling the coupling elements has to been done with great care Careless handling may damage t...

Page 6: ...e motor TBox cover When a motor is only suited for one direction of rotation it is indicated with an arrow on the motor fan cowl Connecting cables must conform to IEE regulations as must earthing requ...

Page 7: ...2 A motor with e g 230 400V on its rating plate is suited to be switched on directly on a circuit with a voltage of 230V between phases with the winding connected in a delta connection or on a circuit...

Page 8: ...OMEC MOTORS OMT1 OMT2 Mounting Maintenance Instructions Page 8 6 CONNECTION DIAGRAM...

Page 9: ...ion Load the motor gradually and check whether it runs without vibration The motor can be used under deviation of the main voltage 5 or frequency of max 2 compared to the nominal frequency or nominal...

Page 10: ...re tight 8 4 Greasing Before they leave the factory the bearings of the OMEC motors are filled with a high quality Lithium base grease The sizes 56 up to and including 250 are provided with shielded s...

Page 11: ...ly heat to 80 degrees centigrade with an electric induction heater then slip quickly onto the shaft up to the stop In the case of a roller bearing only fit the inner race in this manner Heating temper...

Page 12: ...06 ZZ C3 6306 ZZ C3 30 30 OMT1 112 2 4 6 8 6306 ZZ C3 6306 ZZ C3 30 30 OMT2 132 2 4 6 8 6308 ZZ C3 6308 ZZ C3 40 40 OMT1 132 2 4 6 8 6308 ZZ C3 6308 ZZ C3 40 40 OMT2 160 2 4 6 8 6309 ZZ C3 6309 ZZ C3...

Page 13: ...for about 10000 service hours with 2 pole designs and 20000 service hours with multi pole designs If not otherwise agreed upon the grease need not be refilled during this period Nevertheless the condi...

Page 14: ...nt 11 STORAGE Motors should be stored in a dry vibration free and clean area at normal ambient 20 to 40 Motors should be also stored away from corrosive or chemically damaging fumes Shafts should be r...

Page 15: ...ameplate 24 Terminal Box gasket 7 Spring washer 25 Connection fixation nuts 8 Bearing DE 26 Terminal board 9 Inner Bearing cap DE from size 180 27 Terminal board holder bolt 10 Key 28 Terminal block P...

Page 16: ...OMEC MOTORS OMT1 OMT2 Mounting Maintenance Instructions Page 16...

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