Required fields are marked *, Powered by WordPress and HeatMap AdAptive Theme, Ahmed Farahat is EECS engineer With 18 years of experience in the field he worked on different technological discipline and and had Measure the motor current. Pressing it opens the N/C auxiliary contact, 95-96. data nameplate motor tersebut: V=400 volt, kapasitas: 110 KW, arus:180 Ampere. One of these is a large blue dial which is adjustable using a screwdriver. Continuous duty motors are protected against overload by a separate overload device sized between 115% and 125% of the motor nameplate full-load current, FLA. Motor manufacturers have designed several types of separate overload devices with sensing elements that will “trip” when the motor is overloaded. Semoga coretan yang singkat ini bermanfaat. The Test lever will not operate in the Auto position. This may be done using a suitably sized screwdriver. Take Full Load Amps of Motor and divide by CT ratio The overload protects the motor, the overcurrent protects the wire. Your email address will not be published. data nameplate motor tersebut: V=400 volt, kapasitas: 110 KW, arus:180 Ampere. If you put in a different size breaker the answer does not change. Hapus. C440 OL CT Adjustments.doc. The operator or attendant will have to physically confirm that the motor has had sufficient time to cool down and that the cause for the overload has been removed. Pressing this button with a small flat screwdriver will simulate the tripping function. Because the time/current curves are very far apart from each other, don't ever think that one will adequately protect for the other. This is a multiplier of the Ir setting, often 1.5 to 10 times the Ir current (im=xIr) Protection against short circuits. This is very useful for checking the control circuit wiring during commissioning. An unmarked overload relay is always Class 20. If the motor current is 22A and the rated full load current is 20A, then the load factor is 22/20 = … In many cases, the drive components may need to be suitably aligned with the motor to avoid any mishaps of this nature. I have an Exd motor located in a zone 2 hazardous area. pada saat start awal arus mencapai 800 A, berselang 5 detik proteksi overload langsung kerja dan motor TRIP. To further calculate your setting use the following formula. It is simply rotated so that the required figure in Amps is in line with the white arrow on the body of the relay. what is the formula for setting overload relay of a three phase electric motor.? http://www.phoenixcontact.com/contactron Setting the overload settings on the 9 Amp CONTACTRON 4-in-1 three-phase motor starter. In this way all motor FLC values are catered for. If set too high, they will not provide proper protection for the motor. When set in the Auto position ( press in using screwdriver before attempting to turn ) the button is held in. If these figures don't match, then measuring the motor current may not give a true indication of motor heating and overload. Menghitung Overload Relay, Motor sangat perlu adanya pengamanan beban berlebih yang biasanya di sebut overload, ... jika melebihi dari setting Overload maka bisa di cek di overloadnya, seperti : 1. kontak poinya 2. umur overload mungkin itu dlu bisa dicoba bang . The overload relay in Figure 42 is suitable for any motor with a FLC of 1.6 Amps to 2.5 Amps. Divide by the rated full load current from the motor nameplate. Generally, this is set at 110% of the total power capacity of the motor. where a motor overload device is so connected that it does not carry the total current designated on the motor name plate , such as for wye-delta starting , the percentage of the motor nameplate crrent applying to the selection or setting of the overload swhall be clearly marked on the motor starter shown in the motor starter manufacturs overload selection table For the US and Canada, the rated frequency should be 60Hz. please see attached for adjustment settings based on CT's used. (tr=Sec) Protection against overloads: Im / Isd: Short time (Magnetic Setting). The red button is simply a local stop button. It must now be pressed to reset after a trip has taken place. The overload device must trip when needed but allow the motor … Electronic thermal overload protection This function is set to protect the electric motor from overheating, it calculate the AC motor temperature rise by the VFD internal CPU base on the operation current and frequency, thus to enable overheating protection. A thermal overload relay works in the principle of electro-thermal properties in a bimetallic strip. However if motors are designed with a service factor, which is then shown on the nameplate eg.
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