Any sort of work which includes an exposure to electrical circuits and equipment involves its own set of risks. Particularly, electricians are exposed to these hazards on a regular basis. We commonly know that electric shock is the only danger electricians are exposed to, but little do we know that electric arc explosion is an equally perilous threat, which can generate blistering heat called arc flash that can cause lethal injuries. read more
This post is a continue from the troubleshooting electric motors part 1.As I mentioned on my last post, I will share information and guideline about electric motors breakdown.
Once it has determined that the motor is at fault, you can proceed to locate the problem with the motor. A troubleshooting guide outlines a comprehensive variety of motor problems.
Generally the categories are arranged according to symptoms, offering brief suggestions concerning what to look for when investigating motor failures and often providing advice on how to correct the problem once it has been identified. read more
Breakdown causes by electric motor failures always happen in our operation due to of 2 major factors.It is Mechanical component defect and Electrical circuit failure.
Typical instruments used for troubleshooting motor operation problems include a Multimeter, Clamp-on Meter,Insulation Resistance Meter, and Infrared Thermometer. These instruments are used to measure voltage,current, resistance, insulation resistance, and temperature.
But when we involve for electrical testing,it have a risk and can lead to injury or electrical shock.We must aware during handling electric motor and to reduce the risk we need to follow safety procedure to avoid any incident by certain to read more
Basically electrical motor have a phase to phase winding coil around armature to created a magnetic field.To avoid shortage between phase to phase winding,the insulation systems needed.
It consists of the groundwall insulation and turn to turn insulation. Typically for induction motor insulation is the slot of paper to protect between cooper and ground surface.For phase to phase insulation normally used sheet of insulation paper laid between phase. read more
As we known,rubber is very good for electric insulation.It used in many electrical safety equipment and device to protect person from electric shocked.Rubber mats is a rubber sheet commonly used at sub station and control panel.
The main purpose is to cover and insulate floors from electric path away to the earth and to avoid completed circuit when current flow in human body.It can save our life from electric shock when perform electrical task.
We must ensure the rubber mats have a quality and follow electrical regulation standard and specification.Please checked the rubber mats condition and apparent it is in good shape to avoid any injuries or death causes when electric shock happened. read more
When we perform insulation resistance tester,temperature winding effected the accuracy of Mega Ohms reading.The basic theory is when temperature increase,the insulation resistance decrease due to physical factor of material for winding.
To get a accurate reading for insulation resistance ( Mega Ohms ),we need to ensure the minimum temperature during measurement.
According to IEEE 43,the temperature correction should be to 40 °C and the correction factor for temperature is such that the minimum insulation resistance value is doubled for every 10 °C decrease in winding temperature. read more
In air-condition system,compressor is a main component to pump the refrigerant circulation in system.It like our heart to pump a blood all around human system.If this part breakdown or have a problem,all system is paralyze.
Normally for single phase air-condition system,the common type of electric motor is running capacitor motor and used scroll type compressor.The famous brand now in market such as Copeland,Daikin,Toshiba,Mitsubishi and others brands.
I want explain about single phase motor for air-condition or refrigerator compressor basic concept and how to check their winding condition and connection. read more