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Braking Resistors

 

     Electric motors in certain cases run as a generator by the machine that it is operating and feeds the electric network. If the motor is required to stop or slow down to nominal speed in such cases, a resistor with suitable ohmic and watt ratings is connected to inverter braking terminals in order to convert the energy generated by motor to dc current and convert it into heat through inverter braking resistor. Required power of a braking resistor (dynamic braking) in order to brake a motor that rotates at maximum speed and maximum load must be equal to the power of the motor. However, as the braking time is generally around a few seconds, a resistor power rating that is smaller than motor's rated power can be over loaded for a short time in order to provide an economical way of braking.

       Braking resistors for variable frequency drives. Inverters and drive motors with a dynamic load that requires quick stopping. braking resistors are used to stop ac and dc motors with inverter control. Design of  Braking Resistors depend on recommended braking periods or specific applications. 

Applications:

·            Elevators

·            Cranes

·            High speed machines

 

 

 Benefits:

 

 

·            Decelerating a load with large inertia

·            Increase the control torque of the inverter

·            For frequently repeated ON/OFF cycles

·            Compact construction

·            Easy installation

·            Suitable for the use with any frequency drive

·            Compact design

·            Protection

·            Dielectric strength

·            High temperature wire

·            CE Marked

 

         No.

Model

         Description

       Ohms

         Watts

             1

             MH60-15-J 

                15  

               60

             2

             MH100-15-J

                15

               100

             3

             MH200-10-J

                10

               200

             4

             MH200-5.8-J

                5.8

               200

             5

             MH200-320-J

                320

               200

             6

             MH400-10-J

                10

               400

             7

             MH400-320-J

                320

               400

             8

             MH400-160-J

                160

               400

             9

             MH500-120-J

                120

               500

             10

             MH1000-80-J

                80

               1000

             11

             MH1000-120-J

                120

               1000

             12

             MH1000-160-J

                160

               1000

 

 



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