WAZIPOINT Engineering Science & Technology: LOW VOLTAGE CONTROLED MOTOR WIRING SYSTEM

Sunday, October 4, 2020

LOW VOLTAGE CONTROLED MOTOR WIRING SYSTEM

Three Phase Motor Wiring
Fig- Low Voltage Motor Control Wiring Diagram

Three Phase & Single Phase Motor Starter Wiring System with Low Voltage Control


This article for the purpose to present the wiring system for both single and three-phase magnetic controlled motor with low voltage control (LVC) system.  Who think safety is the first priority for motor starter wiring, this article will help them. Motor ON-OFF switch is controlled herewith safe low voltage instate of the supplied power line.

The main and special feature in this motor control system is no voltage or low voltage protection system, low voltage control system, motor overload protection system refer to the figure below.

Main Safety Feature for LVC Motor Starter

Due to low voltage or no voltage, the magnetic contact will release the contact and motor will disconnect from the power. When power reinstates, if the motor restart automatically that may because of the dangerous accident for motor or human. To prevent this auto-restart a manual Start & Stop system is included here in this system. If temporary power failure then until the manual start, the motor will remain stopped.

The main supply voltage is dangerous for an electrical shock during coming very near to ON-OFF switch. But in low voltage controlling system what is provided here can eliminate the dangerous electric shock provability. Here ON-OFF system operates by the 24-volt low voltage that is very much safe for the operator.

If motor being overloaded and run for a long time then hues possibilities to burnout the equipment. Prevent motor damage from overload a motor overload protection system is also associated with this low voltage motor control system, a thermal overload relay which protects the motor from overloaded.

Every electrical installing and servicing should not try except clear understanding and qualified electrical personnel.

Three Phase LVC Motor Starter Wiring Diagram

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Refer to the above 3 phase LVC motor starter wiring diagram, if you study the wiring line and try to find the basic components of the diagram, you will find the following major components:
      • magnetic contactor with coil;
      • overload with heater;
      • start/stop station;
      • connection and relation between different component.

The unique feature of this wiring diagram shows the relation and connection of both power circuit and control circuit together which makes very easy understanding even for any new technician. The blue line shows the power line and the red line shows the control wiring. Also, all component are shown in black colour and grounding or earthing system shown in the yellow-green line.

Single Phase LVC Motor Starter Wiring Diagram
Actually, nothing special for single-phase LVC motor starter if you have the three-phase wiring diagram, just consider the phase number 3 is not in the above 3 phase diagram, then you will get a single phase wiring diagram. Single-phase motor terminal T1 & T2 and power source L1 & L2 will remain in the above diagram.

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