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What is the cause of the compressor if not trip to its overload?
What is the cause of a compressor if not trip to its overload
Why one phase shows 0 Amps while a delta connected 3 phase induction motor runs?
Cause 2 phase is applied to the motor and another phase is disconnected ... in this condition ur motor cannot run longer ,it will trip on over current or burn ur motor winding .
What starting device is used on single phase fractional horsepower compressor motors?
A centrifugal switch is used on the starting winding of fractional HP motors. It is used to start the motor one the start winding and at a predesignated rotational speed the switch opens to de-energize the start winding and the motor carries on running on the run winding. Another device that should be on compressor motors is an unloader valve. Sometimes it is electrical driven and other times it is mechanical. It is used to used to unload the pressure from the compression cylinders. Without this pressure being unloaded the motor has to start against the pressure in the cylinder head and the added current draw on the motor is sometimes enough to trip the overload protection of the motor.
Overload Trip Class - What does it really mean?
Quite often we here of applications in which the motor protection/overload relay 'trips' during motor starting. The remedial action taken by many when faced with this problem is to select and install a replacement overload relay, generally one that provides a higher 'Trip Class' setting, for example, Trip Class 20 in lieu of the standard Trip Class 10.Note: The appears to be a general misconception in industry that Overload Trip Class relates directly to the starting time of a machine. This is not the case.All due care must be taken when selecting a protection relay offering higher Trip Class, as this can result in under protection and subsequent failure of the motor.To select an overload relay with a more suitable trip class, you must in the first instance obtain data relating to the motor's thermal withstand capabilities. That is, you need to know how many seconds (from cold condition) the motor can the sustain Locked Rotor Current before it is compromised.This information is readily available from most leading manufacturers of motors and is generally provided in one of two formats.a) Specific values for Locked Rotor Current and maximum Locked Rotor Time (from 'cold condition' ) are given.b) A Motor Thermal Withstand Curve is provided.With this information available to you, you can refer to the tables given in IEC 60947 to identify the most appropriate Overload Trip Class. This is defined as the one that provides a trip curve as close as possible to but below the overload curve of the motor. Adopting this process will ensure nuisance tripping is minimised and that the motor is adequately protected at all times.Note: If the above processes are adopted but the trip conditions continue, there are 4 possible causes.1. The motor (and overload relay) are not given sufficient time to cool between starts.2. Assuming reduced voltage start (star/delta, auto-transformer, primary resistance, soft start etc., the motor is not delivering torque sufficient to accelerate the connected load to speed. That is the starting current and starting time under RVS conditions exceeds that permissible by the overload curve.3. A more advanced protection strategy such as motor thermal modelling may be required. Motor thermal modelling allows the user to 'match' the curves of the protection device to the connected motor. This is of particular advantage when the motors thermal withstand capabilities and the start condition (starting current and starting time) fall between two curves defined by standard overload trip classes.4. The motor is simply too small for the application.Put simply, the most appropriate protection strategy is the one that allows the motor to be fully utilised without nuisance tripping or fear of motor burn-out.
3 phase 480 volt motor that continually trips the heaters?
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.
What is the cause of the compressor if not trip to its overload?
What is the cause of a compressor if not trip to its overload
What will cause a star delta panel to trip in delta?
On a star delta starter a motor overload or a motor going to ground and cause a short circuit will cause the overload protection to trip. These overloads have to be reset before the motor can be restarted.
Even after changing the start relay and the capacitor what would keep a Frigidaire refrigerator compressor from starting and just buzz?
If the compressor is still not starting and just buzzing after changing the start relay and capacitor, it could indicate a faulty compressor motor or a more serious electrical issue within the refrigerator. It would be advisable to have a professional technician diagnose and repair the problem to prevent further damage to the appliance.
Why does Ac trip breaker when on heat it doesn't?
That tells me the problem is with the outdoor unit. Most likely a dead compressor or fan motor. Additionally, your indoor and outdoor units are not on the same breaker.
Compressor stops running after a while and will not restart until it has cooled.?
There are a couple of things to check. First did the compressor reach its cut-off pressure? If it did and then tries to restart after reaching its cut in pessure, then you can suspect that the unloader valve is not functioning. This valve relieves the pressure that the motor has to work against. This is the hissing sound that you should hear sfter the compressor stops running. Compressors will normally not start under pressure and this leads to a locked rotor and an internal circuit breaker will automatically trip. After cooling off, this overload swith will normally reset itself. On some machines, this may have to be done manually. Once the motor has cooled, simply push the red button and if it clicks, that was the problem.If the compressor did not reach its cut-off pressure before shutting off, then the most likely cause is a shorted winding in the motor. This is not repairable and you have to get a new motor. Another possibility is that the motor is undersized, working against too much load (i.e. bad compressor, no oil, etc.) Make sure you check this before tossing out what could be a good motor.
Can a small mini-fridge be plugged into the same circuit as the washer machine?
Not a good idea in general. There is a large chance that you will trip what I expect is a 20 A breaker controlling the circuit. It may seem to work under some circumstances, but if the refrigerator compressor kicks in while the washer motor is demanding a surge current on motor start-up the breaker will likely trip.
The compressor overload should be set at at how many amps?
The compressor overload should generally be set to trip at around 10-15% above the rated running amps of the compressor motor. This helps protect the compressor from overheating and potential damage during prolonged overcurrent conditions. It is recommended to refer to the manufacturer's specifications for the exact amp rating.
What happen If one phase of the three phase induction motor is not supplied?
If the motor was lightly loaded it may continue to run, however in most applications the loss of the phase would cause the motor to stop. Properly wired and it should trip the motor overload device and prevent damage to the motor windings.
What will cause a motor to go into a locked rotor state?
The only time a motor should go into a locked rotor condition is if the motors connected load jams causing the motor to stop turning. At this point if the motor control circuitry is sized to the motor's full load amperage, the high rise in current will trip the motor off line.
Is it possible to stop the rotation of motor even if the power supply persists?
Yes. With enough of a load on a motor the rotation can be stopped. As the motor starts to slow down the current draw of the motor starts to go higher. Usually what will happen is as the current goes higher the overload protection on the motor's starter will trip and disconnect the electrical supply from the motor long before the motor stops turning.
Why one phase shows 0 Amps while a delta connected 3 phase induction motor runs?
Cause 2 phase is applied to the motor and another phase is disconnected ... in this condition ur motor cannot run longer ,it will trip on over current or burn ur motor winding .
What is wrong with Kenmore dryer that won't stay on and the motor makes a scratching sound?
Sounds like the motor is bad or the motor bearings are bad. This will create more resistance and will therefore create more current in the circuit. More current in the circuit will cause the overload to trip. This is for safety to prevent excess heat building up in the circuit which could cause a fire.
