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As we have discussed before, all overload relays have one major limitation - because they operate on line current, they do not directly sense the motor temperatures. However, with proper heater selection and careful attention to the factors that affect heater performance, the overload relay can work extremely well to protect the motors. Some of these factors that need close attention are: Motor full load current Motor temperature rise rating Service factor Ambient temperature at the motor and at the protector Motor locked rotor current ratio Starting time Duty cycle Locked rotor endurance time. Article: As we have discussed before, all overload relays have one major limitation - insofar as they operate on line current, they do not directly sense the motor temperatures. However, with proper heater selection and thorough punctuality to the factors that operate on heater performance, the overload relay can work extremely well to protect the motors. Some of these factors that need bear up study are: Motor full load current Motor temperature rise rating Service factor Ambient temperature at the motor and at the protector Motor locked rotor current ratio Starting time Duty cycle Locked rotor endurance time. If heedfulness is not given to these factors, the overload relay will perform poorly. The other factor to be considered is maintenance. are some maintenance routines: Cleaning - The overload relays should be refined periodically. Dirt or dust created by the operating conditions in the plant tends to settle in a circle the moving parts in the device and prevent it from operating properly. Tightening connections - in that most overload relays make use of current flowing through heater elements to sense overloaded conditions, it is important that the electrical terminals are not loose. Loose electrical connections can create extra heat and impulse false tripping of the relays. Inspecting heater size - Heaters can oxidize over a period of time and erupt smaller in cross section. The smaller current flowing in the smaller heater generates the same tab of heat to bring to pass unnecessary tripping of the relay. With dutiful selection and maintenance, overload relays are excellent for motor protection. The wide use of thermal overload relays in industry attests to their resignation as the most practical means of protecting motors from overloads. And they are the most economical solution available. Until next time... 'Looking For Magic Gadgets Discount?' Gifts for Curious Minds expands Our Thinking! Will it Spark the Genius in You?
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