How a DC Magnetic Motor Controller Works - Basic Troubleshooting of an Old DC Motor Starter(2)

Update:29 Nov 2019
Summary:

During acceleration of the motor, contactor or other kn […]

During acceleration of the motor, contactor or other known as FA field accelerator contacts remained closed. This contact ensures that the motor is running at a constant speed until full power is applied to the magnetic field parallel to the electric motor. It is also referred to by some manufacturers audience FF contactor or contactors. Once the motor has reached its proper speed, the FA or FF contactor opens, and the motor speed control to the rheostat. Rheostat in series with the shunt field. Parallel current flow through the magnetic field by changing, you can adjust the speed of the motor. If the motor winding or mechanical failure load is too large, it will add some form of protection in the motor starter. FL dissipation contactor or contactors is typically designed to parallel magnetic field coil in series. Parallel excitation circuit will result in an open field loss contactor open and disables a control circuit, which acts like a stop button is pressed. Another form of protection circuit is overloaded. OL OLX contactor or contactors are used to monitor the overload condition. Role of these contacts is also similar to the stop button. Overload usually sensed current and short circuit since the inner winding open circuit, motor brush motor failure, mechanical failure or mechanical failure of the motor due to the motor bearing abrasion caused by the connected devices due to flow through the motor armature excessive . Parallel excitation circuit will result in an open field loss contactor open and disables a control circuit, which acts like a stop button is pressed. Another form of protection circuit is overloaded. OL OLX contactor or contactors are used to monitor the overload condition. Role of these contacts is also similar to the stop button. Overload usually sensed current and short circuit since the inner winding open circuit, motor brush motor failure, mechanical failure or mechanical failure of the motor due to the motor bearing abrasion caused by the connected devices due to flow through the motor armature excessive .

Parallel excitation circuit will result in an open field loss contactor open and disables a control circuit, which acts like a stop button is pressed. Another form of protection circuit is overloaded. OL OLX contactor or contactors are used to monitor the overload condition. Role of these contacts is also similar to the stop button. Overload usually sensed current and short circuit since the inner winding open circuit, motor brush motor failure, mechanical failure or mechanical failure of the motor due to the motor bearing abrasion caused by the connected devices due to flow through the motor armature excessive . Role of these contacts is also similar to the stop button. Overload usually sensed current and short circuit since the inner winding open circuit, motor brush motor failure, mechanical failure or mechanical failure of the motor due to the motor bearing abrasion caused by the connected devices due to flow through the motor armature excessive . Role of these contacts is also similar to the stop button. Overload usually sensed current and short circuit since the inner winding open circuit, motor brush motor failure, mechanical failure or mechanical failure of the motor due to the motor bearing abrasion caused by the connected devices due to flow through the motor armature excessive .


These other optional items added to an electromagnetic motor starter assembly is, for example, an external ammeter for observation personnel. Load table is a good example of current monitoring, which modified the load on the electric motor can be displayed to the operator in real time. Also reversible option, may change the direction of rotation of the motor by a mechanical switch or handle. Familiar magnetic DC motor starters and basic electrical skills, their experience, these manufacturers in any one of the control circuit troubleshooting will be easier, because the concept of Cutler Hammer, GE, Allen Bradley and Westinghouse and basic principles Figure always similar.

 

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