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How To Set Thermal Overload Relay. The purpose being to fully protect the motor and at the same time avoid the nuisance trappings. What causes a thermal overload relay to trip?
Thermal Overload Relay 80.0093.00 Amp ElecDirect from www.elecdirect.com
Thermal olr is based on the principle of deformation of a bimetallic strip on heating. Normally for overload relay setting depend on fla ( full load ampere ) of motor.we can see at the nameplate of motor.normally setting for overload is 5% until 10 % more than fla. Based on the principle of operation they are classified into thermal and electronic overload relays.
The Heat Produced By The Overload Current Is Utilized To Trip The Motor Circuit.
What causes a thermal overload relay to trip? Hope this willclear allthe doubts. Figure below shows a typical thermal overload relay.
Thermal Overload Relay Setting = 100% X Full Load Current (Line).
Reaction time is slow, and typically if. An adjustment dial located on the unit allows the ampere trip setting.a manual test button is provided to test the operation of the overload relay control contacts. The supply current to the motor flows through the heater winding and heats the alloy.
This Current Rise Heats The Bimetal Strips Within The.
Hence, it can be concluded that the operating time vs actuating current curve of the chosen thermal over load relay should be situated below the thermal limit curve of the motor but above the starting. The range of the relay should be such that it allows a maximum setting of 10 to 20 percent above the full load current of the motor. Thermal olr is based on the principle of deformation of a bimetallic strip on heating.
Then Select The Model Of The Thermal Relay Based On The Rated Current.
The correct setting for a thermal overload relay depend on the type of relay, the supply impedance and the type of load. A thermal overload relay is a safety device used in manual control circuits. Eutectic thermal overload relays use a eutectic alloy (a combination of metals that melts and solidifies at a defined temperature), housed in a tube and connected to a heater winding.
Size And Type Of Contactor.
The rated current of the thermal relay should be greater than the rated current of the motor. Thermal overload relays are useful electrical devices which are used to protect the functioning of motors. The construction of thermal relay is quite simple.
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