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By the phrase "trips the heaters" I am assuming that you meant the Overloads. There are 3 possible answers: 1) The Overloads are not the correct size or are in a high ambient temperature envornment. Most manufacturers have sizing charts that take these into account. 2) The motor is bad or in the process of going bad. 3) The motor is overloaded. If you are running a 7 1/2 HP motor on a load that requires 10 HP then the motor will draw too much amperage and trip the overloads.
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If a three phase motor loses one leg will it turn backwards before it burns up?
If a three phase motor loses one leg it will do neither of what you suggest. To change the rotation of a three phase motor any two motor leads must be interchanged. When one leg of a three phase system goes down it is said to be single phasing. The overload protection on the motor senses the higher current on the other two legs and trips the overload heaters. This in turn drops the contactor open and disconnects the motor from the supply.
What is the use of centrifugal switch in single phase induction motors do all single phase motors gave them?
To stop a three-phase motor dead ('plugging'), rather than allowing it to slow to a stop, the motor controller interchanges two of the three lines -which applies a reverse torque to the machine. But before the motor then gets a chance to reverse direction, the centrifugal switch trips the starter and removes the supply. <<>> The centrifugal switch that you refer to and can see in an open frame motor, is used to open the start winding of small HP single phase motors. Once the motor gets up to a certain RPM, the switch opens and the motor continues to operate on its run winding. When the motor stops, the switch goes back to its normally closed position in the start winding and awaits the next start operation.
Can the tripping due to inrush current be suppressed by either decreasing the sensitivity.What are the drawbacks involved?
The only breakers that allow any adjustment at all are usually three phase and used on motor starting. These types of breakers have overload rated trips installed into them. The breaker has to be sized by code to 250% of the motors full load amperage. The adjustment is in the time that the breaker will hold the 250% overload before tripping. The draw back is that the longer the time for the motor to start, the quicker the motor will heat up. It is the prolonged heat that finally destroys the insulation on the motor's winding and will finally lead to a shorting of the windings to ground or to themselves.
What are the points to be check when an induction motor is contniously tripping?
If it is a fractional horse power motor and it states on the nameplate that it is thermally protected, check that the cooling holes are not plugged and that the ambient temperature is not over 40 degrees C. On larger motors that use thermal trips in a starter take a current reading to find out how high the current is going before it kicks out. Usually what trips the motor out is the connected load. If the load is belt driven take off the belts and then check the motor again. If it is running within its specifications then it is the load that is causing the problem. Get a millwright or a mechanic to find the problem with the driven load.
How can you have a ground fault protection in a 3 phase 3W system?
3 phase ground fault detection on a 3 phase system requires that the vector summation of all three phase currents be measured. The vector sum of these currents should equal zero, or nearly zero for a balanced system. If a ground fault exists, then the vector sum will not equal zero. This condition must be validated using i2t techniques in order to eliminate false trips.
Describe the steps you take to troubleshoot a 3 phase 480 volt motor that continually trips the heaters?
Start by checking the motor current when the motor is running under load with a clamp on amp meter. If it is over nameplate rating, check and find out if the load the motor is driving is somehow dragging and creating more load that normal. 98% of the time it is the load seizing up that causes motors to trip. Drop the load off the motor and see if the motor runs under nameplate amperage. If it does that is good. Check for loose connection in the motor contactor and around the overload heater block. Check and make sure the overload heaters are set to the FLA of the motor. As a last resort megger the motor to make sure one of the phases has not grounded out.
If a three phase motor loses one leg will it turn backwards before it burns up?
If a three phase motor loses one leg it will do neither of what you suggest. To change the rotation of a three phase motor any two motor leads must be interchanged. When one leg of a three phase system goes down it is said to be single phasing. The overload protection on the motor senses the higher current on the other two legs and trips the overload heaters. This in turn drops the contactor open and disconnects the motor from the supply.
What cause the Main Breaker trips when I start a 30KW 3-phase Motor(Star Delt Starter)?
The wiring is like this:[[30KW Motor ---- Star Delt Starter(100A Breaker inside) ----- 200A Breaker------50A Breaker(Inside the breaker box which located inside the factory) -----100A Main Breaker]]Once I try to start the Motor, the Main Breaker trips immediately.
What is a turbine trip?
A turbine trip is an automatic shutdoen to protect the wquipment from over-speed damage. It is similar to blowing a fuse on an electrical system die to a short circuit. ------------------------------------------------------------------------------------------- Any device which will instantly shut down the turbine. There are high vibration trips, overspeed trips, high bearing temperature trips, low lube oil pressure trips, eccentricity trips, axial position trips, and for generating units: out of phase trips, low voltage trips, high voltage trips, reverse power trips, power to ground trips, and a few others.
What is the use of centrifugal switch in single phase induction motors do all single phase motors gave them?
To stop a three-phase motor dead ('plugging'), rather than allowing it to slow to a stop, the motor controller interchanges two of the three lines -which applies a reverse torque to the machine. But before the motor then gets a chance to reverse direction, the centrifugal switch trips the starter and removes the supply. <<>> The centrifugal switch that you refer to and can see in an open frame motor, is used to open the start winding of small HP single phase motors. Once the motor gets up to a certain RPM, the switch opens and the motor continues to operate on its run winding. When the motor stops, the switch goes back to its normally closed position in the start winding and awaits the next start operation.
What will cause electric motor to shock you when you touch it?
The motor winding has gone to ground internally. The ability of the motor to shock you is caused by the ground wire missing or not connected. It is this ground wire that trips the breaker in short circuit conditions and disconnects the motor from the distribution system.
Breaker trips after running pool motor about 8 hours the timer was changed the receptacle was changed but you noticed a little bit of rust on the plug to the pool motor should that be changed?
Pool motor is overheating and or a short in the motor. You need a professional pool tech to troubleshoot.
Why is it the control of a three phase motor trips when changing from wye configuration to delta?
Few things to look for, one, are the contacts good on the run contactors. Two, has the motor wiring been changed in any way, contactors or leads on motor. Trace wiring and make sure the leads are paired correctly to the starters. Three, make sure the start timer is not bringing the run contactors in too late. Also check that the shorting contactor is opening when the run contactor comes in.
Can the tripping due to inrush current be suppressed by either decreasing the sensitivity.What are the drawbacks involved?
The only breakers that allow any adjustment at all are usually three phase and used on motor starting. These types of breakers have overload rated trips installed into them. The breaker has to be sized by code to 250% of the motors full load amperage. The adjustment is in the time that the breaker will hold the 250% overload before tripping. The draw back is that the longer the time for the motor to start, the quicker the motor will heat up. It is the prolonged heat that finally destroys the insulation on the motor's winding and will finally lead to a shorting of the windings to ground or to themselves.
How do you use a 3 phase contactor in a single phase installation?
A CONTACTOR SHOULD NOT BE USED TO START A 3-PHASE MOTOR unless there is some sort of motor protection in series with it. You would need a 3-phase contactor and just connect each phase (1 wire) to each terminal of the line side of the contactor, and the 3 wires to the load side. 3 wires on the line side, and 3 wires on the load side.
Why do the windshield wipers go on and off 1996 Dodge Grand Caravan?
The wiper motor has a switch inside of it. When they are turned off and the wipers go to the down position it trips the switch in the motor that tells the computer they are in the down position. If that switch in the motor is faulty, the wipers are repositioning until the switch is tripped to the off position. THE FIX.... Replace the wiper motor.
How may iles per gallon does a Jetta TDI get?
Motor trend tested one and was able to get 710mile on a tank(48.7mpg). Other trips averaged 41-44mpg.
