Thermal Imaging Cameras

The Motor Control Center

The MCC enclosure protects from personal contact with an electrical device and protects the components from different environments. It ‘important that the camera is mounted to ensure accessibility to that qualified personnel may) (eg, training thermographic panel opening under load. There are several categories and types of CMC, but in general, seen as an MCC series of cabinets, with each company represents a section of the CMC. The cabinet file drawer is the plug-in units that contain components of motor control. phase in CMC with bars, supermarkets metal bars today. The bus has three horizontal stages of distribution of power to a power outage. vertical bus in each section is connected to it for each MCC. orthoses and isolation are barriers to protect against fault conditions. The plug-in MCC shares in the power of a mesh back so that they are connected to the bars of the vertical structure of power.

Your early inspection infrared MCC

Before opening the door panels or on a DC motor, prescan the cabin, opening a safe condition is true. If the excessive heat will appear on the surface of the door, additional precautions must be taken in open. Thermography or escort may decide it was unacceptable, and not the ability to see the opening under load. Once the device is opened, it begins to exist in the field of infrared and visual inspection, both to ensure conditions are not dangerous. Inspections are carried out systematically in the infrared. Remember, the system must be subjected to a load to complete the examination. From left to right and follow the path to closely monitor all components. Look for abnormal patterns of connections with high heat resistance, congestion or imbalance due to the load. In three phase systems this can be done by comparing the phases. Adjust the level and scope of the infrared system to optimize the image.

The correct setting is determined by primary and secondary abnormalities. Bus stops and the connection to the main control points are important, often overlooked or misdiagnosed. The incoming connection on the main bus is generally horizontally behind a cover or coating, which is not foldable. They are usually bolted connections in parallel and can have investors. The stab in the back of the bus connectors plug-in units are more difficult to control. Thermography has no direct view of the connection, and the first signs of a problem can be found on the child of food entering the hammer to see, or to separate spindles. Remember that even small increases in temperature can be determined at this stage have serious problems.

Engine and the engine management

The purpose of the starter motor that protect the engine, the personnel and equipment. Approximately 90% of the motors are three-phase induction motors and motor starters can be started and stopped. A generic term to identify this equipment as a stepper motor. A controller can have different functions, such as starting, stopping, greater protection against overcurrent, protection against overloads, reverse and braking. The starter motor has been selected to match the voltage and power system. Other factors to be elected the starters: speed, torque, full-service load current (FLC), (SF) and Fair (worth 10 or 20 seconds).

Understanding the thermal design of these devices is crucial for a successful test. Also correctly identified the origin of this anomaly may be helpful recommendations.

Engine may be damaged or significantly reduces their life if the work continued at full load current of a stream. The engines are supplied for use in monitoring the peak current or increase in temperature of the rotor locked, without more, is a limited time and a limited number of launches. Until now locked rotor currents are most often caused by mechanical overload of the motor. National Electric Code (NEC), describes the current security situation, such as  “the engine overcurrent (overload) protection. ” This can be reduced and overload protection. Overcurrent due to short circuits or failures due to soil, resulting in much higher than the beginning due to mechanical overload or excessive.

The NEC describes this type of overcurrent protection, such as  “automotive branch circuit protection against short circuit and earth fault. ” This may be reduced to surge. The four varieties common to start the engine are among the appetizers-back-line, the starter lowest speed and voltage starters. Motor starters are generally the same types of components. These include a circuit breaker or fuse disconnect, contactor and overload. It may incorporate additional elements, including the control circuit and a transformer. Understanding the thermal design of these devices is crucial for a successful test. Also correctly identified the origin of this anomaly may be helpful recommendations.

Overcurrent

NEC groups overcurrent protection and a way to separate the motor and the control voltage. Fused disconnects or thermal magnetic circuit breakers are generally used for cleaning and separation and the circuit. A switch is NEMA as a device and not a cycle in the quasi-automatic start automatically connect on a predetermined overcurrent without injury to determine if properly applied within its rating. If we look at a section of a circuit breaker, we have problems with the connection. Studs line side and load side are the most common source of heat anomalies, but the switches have a lot of lives of a second behind the hammer. The heat from this context that the most important pin can be diagnosed. There are also internal contacts in which the flow is interrupted by the exercise component.

The arc contacts experience each time the switch opens. An arc is a discharge of electricity jump through an air gap between the two contacts. Arches are formed when the contacts of a switch is opened under load. Arc is formed under normal load is very low compared to a period of interruption of short circuit. Arc creates additional heat and can damage the surface of contact. Contact damaged can lead to resistive heating. Models of heat of these compounds appear to diffuse on the surface of the hammer poor heating. In addition, there are different types of surfing, which uses internal circuitry to protect the wheels. These coils are combined heat and can be with them seem to come out with a heating element, when in reality it is a normal condition.

Fused disconnects

Fusa be used separately to provide overcurrent protection for vehicles in the same way as a switch. Instead of opening the contacts, the fuses are not the open road. If you overload by fuses, circuit breaker is needed for the planned opening of the manual. Disconnectors and fuse block is an assembly in general. Connections to hinge on the counter blade is a typical source of overheating. High strength due to abuse or under-employed is usually the case. To separate the fuse clip is also a weak point of connection for some models. Different types of fuses or producers in the same heat current can lead to different signatures. Even if the size or amperage fuses also several thermal models can collect points appear warmer than the rest of the circuit due to the size of the driver.

Sagittarius

Appetizers for two blocks, contactors and overload protector did. Contactor control the flow of electric current to the motor. Their function is to create again and again and break an electrical circuit. A shooter can stand on its own as a power to external control, or as part of an appetizer. Electromechanical contactors working with a small ongoing control to open and close the road. Electromechanical components do the job, not the hand of man, as is the case, go with a knife or a manual control. The sequence of operation of a switch is as follows: first, a control current applied to the flow of current in the coil after coil produces a magnetic field that magnetized the e-framework to an electromagnet and, finally, electro – magnet attracts the anchor on it and closes the contacts. A contactor has a life expectancy.

If the contacts of the contactor are often open and closed was the length of the device. Since the contacts are exercised, creates an arc between the contacts. Arcs produce heat that can damage the contacts. Finally, the contacts are oxidized with a black deposit. This can actually filing black improve the electrical connection between the contacts through the improvement of the seat, but traces of burns, bites and corrosion show, it’s time to replace the contacts. Following model temperatures associated with Sagittarius. The coil of the contactor is usually the hottest part of the unit. The high temperatures in May, a breakdown of the coil. Lateral line and load side connections in July can cause high thermal resistance from poor connections. Burned and pitted contacts heating can heat  “visible ” on the body of the contactor.

Overload protection

Overload protection of the engine is a perfect unity with the functions of the current sensor, such as the heating curve of the engine. Would be exceeded in the circuit of the engine at full load. Operation of this equipment should allow the engine to operate with temporary congestion harmless, but opens when the congestion lasts too long.

Typical problems of thermal overload are the connections to the contactor, relay, or motor.

This protection can be ensured the use of a motor protection relay available. Consumption of the motor protection relay for limiting the power to protect the motor against overheating. It consists of a sensor and a current drive mechanism for opening the circuit. A relay motor protection is renewable and can be repeatedly reset to travel and work cycles. Congestion, but provide no protection against short circuits. The league relay (or eutectic) protection consists of a heating coil, a eutectic alloy, and to activate a mechanical mechanism, tripping occurs when an overload. The relay measures the temperature of the engine by monitoring the amount of current is drawn.

This is done indirectly through a heating coil, which, under the overload, a special fund for spin welding Ratchet free and allows open contact. Bimetallic thermal overload is a U-shaped bimetal. The heat causes the bimetallic overload of lead, and then open a contact. The solid state overload relay does not generate heat more like a journey. Instead, current activities or a change of resistance. The advantage of this method is that the relay motor protection doesn  ‘t waste energy generating heat and n ‘ add to the panel cooling. Search for a normal heating thermal overload may be abnormal. The heat generated in the coil or bi-metal connections can be regarded as a problem. Typical problems of thermal overload are the connections to the contactor, relay, or motor.

Appetizers

Appetizers are a combination of a controller, usually a contactor and relay. The above descriptions of each component for the system startup. Reduced voltage starters are used in applications involving high-powered engines. They are used to limit the reduction in the current race and the torque and the load of mechanical stress. The components of this type of initiation must be controlled, while the phases of the motor to accelerate. A small separate circuit voltage starter, the engine used to walk on their toes. Once the speed of operation, these devices are turned off.

Complete Inspection

Remember that the primary abnormality, problems that can easily lift, while secondary abnormalities in May, demanding that the primary abnormality in the saturation to be adjusted to allow the identification of anomalies secondary. For example, different types and sizes of signatures because different thermal fuse as motor protection relays that are different sizes in the same circuit. Anomalies, such as those to be identified and reported. Also note that in assessing the severity of the problem, the temperature is only one variable. All parameters with the severity of the abnormalities in question must be considered. To improve temperature measurements, to avoid too low emission surfaces. Look cavity radiator or emission standards insulation of the conductors. Specific measures, sizing of components, overload, or imbalances of the load are met. Beware of the effects of wind and convection components. Note temperature, thermal gradients, and the source of heating. Security must meet soon.

Conclusion

Knowledge of equipment, you can monitor the correct identification of problems that are ignored or misdiagnosed. The analysis of unknown samples to a thermal component is easier when the design of equipment will be taken into account. More detailed recommendations concerning the repair can be made. Position of temperature differences in qualitative or quantitative is the real advantage of infrared thermography. Knowing where to look for these differences in temperature comes from the knowledge of the equipment and expertise, the equipment will be better thermography.

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