Electric Motors Manufacurer in Vadodara, Gujarat, India - ELCEN Machines Pvt. Ltd.
 
   
 
 
 
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Electrical Features
The various operating cycle of driven machines can be classified into nine basic duties, ranging from S1 to S9
separately indicated in the following pages. Suitable motors can be offered to match the duty cycle of the driven machines.

 
Classes of Duty
The following are the duty types:
 
Duty

S1


S2

 







S3

 

 

 





S4

 

 

 

 

 

 








S5

 

 

 

 

 

 






S6

 

 

 


 





S7

 

 

 

 

 

 

 










S8

 

 
Type
 

Continuous duty


Short time duty

 

 


 

Intermittent
periodic duty

 

 

 





Intermittent
periodic duty with
starting

 

 

 

 

 








Intermittent
periodic duty with
starting and braking

 

 

 

 

 

 




Continuous duty
with intermittent
periodic loading

 

 

 





 

Continuous duty
with starting
and braking

 






Continuous duty
with periodic
speed charges

 

 






Duty with non-
periodic load and
speed variations

 

 

 
Description
 

Operation at constant load of sufficient duration for thermal equilibrium tobe reached. These are our Standard Motors.

Operation at constant load during a given time, less than that required to reach thermal equilibrium, followed by a rest of sufficient duration to re-establish equality of temperature with the cooling medium.

The recommended values for the short-time duty are 10, 30, 60 and 90 minutes.

These motors are generally suitable for valve Actuators, Mixers etc.

A sequence of identical duty cycles, each consisting of a period of operation at constant load and a rest periods being too short to attain thermal equilibrium during one duty cycle. In the duty type, the starting current does not significantly affect the temperature-rise. Unless otherwise specified, the duration of the duty cycle is 10 minutes.

The recommended values for the load factor are 15, 25, 40 and 60 percent.

These motors also come in Crane Duty Applications and the Duty Cycle is designated as S3 – 40%, S3 – 60%.
The No of Starts is also less; either 45 or 60 Starts / hour

A sequence of identical duty cycles each consisting of a period of starting, a period of operation at constant load and a rest period, the operating and rest and de-energized being too short to attain thermal equilibrium during one duty cycle.

In this duty the stopping of the motor is obtained either by natural deceleration after disconnection of the electricity supply or by means of braking such as mechanical brake which does not cause additional heating of the windings.

These are generally suitable for Crane Duty/Lift Duty Applications where Moment of Inertia of the load is maximum equal to Moment of Inertia of the Motor.

Either one has to offer these motors in higher frame size or with extra Active material and with LM6 Rotors or a MS Rotor or a MS Rotor, to reduce the Starting Losses.

The Duty Designation is mentioned as S4 – 60% CDF, 150 Starts / hr etc.

A sequence identical duty cycles each consisting of a period of starting, a period of operation at constant load, a period of braking and a rest period. The operating and de-energized periods being too short to obtain thermal equilibrium during one duty cycle.

In this duty braking is rapid and is carried out electrically.

These are motors where generally Braking is done through Electromagnetic DC Brakes as normal Brake Motors or by Injection of DC Voltage in the Rotor. Since the Braking is done electrically, the Braking Losses are also added to the Starting Losses, thus making this Duty most stringent and heavy.

The Duty Designation is mentioned as S5 – 60% CDF, 300 Starts / hr etc.

Either one has to offer these motors in higher frame size or with extra Active material and with LM6 Rotor or a MS Rotor, to reduce the Starting Losses.

A sequence of identical duty cycles each consisting of a period of operation at constant load and a period of operation at no-load, machines with excited windings having normal no-load rated voltage excitation. The operation and no-load periods are too short to attain thermal equilibrium during one duty cycle.

Unless otherwise specified the duration of the duty cycle is 10 minutes.


The recommended values of cyclic duration factor are 15, 25, 40 and 60 percent. This Duty is different from S2 duty, as in S2 Duty there is a period of rest after the On-Load operation.

Normal S1 duty motors are suitable to operate on S6 Duty provided the Load Inertia is maximum equal to Motor Inertia is maximum equal to Motor Inertia

A sequence of identical duty cycles each consisting of a period of starting, a period of operation at constant load and a period of electrical braking. There is no rest and de-energized period.

This is also a very stringent duty Application similar to S5 Duty Motors, except in this case there is no rest period. These motors may be used for Balancing Machines, Tapping Applications. Either one has to offer these motors in higher frame size or with extra Active material and with LM6 Rotor or a MS Rotor, to reduce the Starting Losses.

A sequence of identical duty cycles each consisting of a period of operation at constant load corresponding to a determined speed of rotation, followed immediately by a period of operation at another load corresponding to a different speed of rotation (carried out, for example, by means of change of the number of poles in the case of induction motors), the operating periods being too short to attain equilibrium during one duty cycle.
There is no rest and de-energized period.

These motors are always Multi-speed Motors e.g. 4P/2P, 8P/4P, 6P/4P etc.

Here the Speed change is done by Pole Changing method. This is achieved by connecting the Motor terminals in two different ways to achieve 2 different speeds.

A duty in which generally load and speed are varying non-periodically within the permissible operating range. This duty includes frequently applied overloads that may greatly exceed the full loads. For this loads. For this duty type, suitable load values should be taken as the basis of the overload concept.

 
 
Application
 

Pumps, Blowers,
Fan Compressors
Operation of gates
of dams, siren,
Capstan

 





Valve actuators,
Wire drawing
machines

 

 





Hoist, Cranes, Lifts

 

 

 

 

 

 









Hoist, Cranes,
Rolling Mills

 

 

 

 

 

 





Conveyors,
Machines
Tools


 

 

 

 




Machine
Tools







Special applications
where the motor is
required to run at
different speeds
and different loads

 





Special applications
where the motor is
required to run at
different speeds and
different loads

 
 
Designation

A duty type is designated by mean of the abbreviation given below. For the duty type S2 the abbreviation is followed an indication if the duration of the duty. For duty type S3 and S6 the abbreviations are followed by an indication of the cyclic duration factor.

Examples :
S2 60 minutes
S3 25 percent
S6 40 percent
For the duty types S4 and S5 the abbreviation are followed by the indication of the cyclic duration factor, the number of
duty cycles per hour (c/h) and the factor of inertia (FI)

Example :
S4 25 percent 120 Starts / hr Load factor =2 (Load Factor = Load Inertia / Motor Inertia)
For the duty type S7 the abbreviation is followed by the number of cycles per hour and the factor of inertia.

Example :
S7 500 Starts / hr Load Factor = 2
For the duty type S8 and S9 the abbreviation is followed by the indication of the number of duty cycles per hour and the factor inertia
together with the load. In addition, the cyclic duration factor should be indicated for each speed.
Examples: S8 or S9 30 Starts / hour Load Factor = 3

 
S2/S3 Rated Motor Outputs
Standard motors can be used for S2 and S3 duties with increased outputs. However, the starting torque and pullout torque as percentage of full load torque would be reduced. The ratings indicated in the table are with minimum 200% pull out torque.
 
TEMPERATURE RISE AND INSULATION GLASS
Normally motors are insulated to Class “F” with a temperature rise restricted to Class “B”. Class “H” insulation can be produced if required.
All the motor winding with VPI treatments
 
 
DERATING FACTOR
Theratings and performance values are specified at 40ºC ambient temperature and below 1000 meter altitude. However the same motor can be used with higher ambient temperature and altitude but has to be derated as specified in adjoining tables.
 
 
 
MOTOR PROTECTION
Normally motors are protected against over current by overload relays, fuses or MCBs. For thermal protection, motors can be supplied with thermister or thermal switch. For condensing environments, motors with space heaters can be supplied as well. The table below is a general guide line for selection of fuse ratings.
 
 
DOL Starting
 
STAR - DELTA Starting
 
Wiring Guidelines

Motors with six terminals have to be connected in accordance with supply conditions. Verify the connection instruction before putting the motor in operation. With different connections of the motor, it is possible to use the same motor at different voltage supplies (Dual voltage motor) Star Connection – On Six termination plate, connect U2, V2 and W2 with link supplied along with the motor and connect three phase supply wires to U1, V1 and W1 to connect the motor in star connection. Delta Connection – On a Six Termination plate, connect V1-U2, U1-W2 and W1-V2 with the link supplied along with the motor and connect three phase supply wires to U1, V1 and W1 to connect end of one phase to beginning of next phase.

 
 
 
While changing the connections, ensure that the rated Voltage is maintained on the supply to brake, rectifier or any other type of equipment that is directly connected to the motor termination.
 
 
Testing
The standard test programmes are divided into four parts: routine tests type tests, optional tests and special tests. The routine test program is done to every machine and it is included in price of the machine. Type test is performed in addition to routine tests normally to one of the machines of a series of similar machine or by a request of the customer. Optional tests and special test are additional type tests subject to mutual agreement between purchaser and the manufacturer.
 
 
CONTENTS OF TEST PROGRAMMES:
ROUTING TESTS   OPTIONAL TESTS

 

TYPE TESTS
  • Insulation resistance test
  • Measurement of resistance of the stator
  • Locked rotor test
  • No load test
  • Reduced voltage running test
  • High voltage test
 
  • Vibrational severity test
  • Sound level measurement
  • Degree of protection test
  • Temp. rise test at limiting values
    of voltage & frequency variation
  • Over speed test
  • Test on insulation system
 
  • Dimensions
  • Measurement of resistance of stator
  • Locked rotor test
  • Temperature rise test
  • Full load test
  • No load test at rated voltage
  • Reduced voltage running test
  • Momentary overload test
  • Insulation resistance test
  • High voltage test
 
Special Customized Designs
Electric Motors Manufacturer in Vadodara, Gujarat, INDIA
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