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There are a couple of things you must keep in mind when troubleshooting centrifugal pump problems:
- The centrifugal pump always pumps the difference between the suction and discharge heads. If the suction head increases, the pump head will decrease to meet the system requirements. If the suction head decreases the pump head will increase to meet the system requirements.
- A centrifugal pump always pumps a combination of head and capacity. These two numbers multiplied together must remain a constant. In other words, if the head increases the capacity must decrease. Likewise if the head decreases, the capacity must increase.
- The pump will pump where the pump curve intersects the system curve.
- If the pump is not meeting the system curve requirements the problem could be in the pump, the suction side including the piping and source tank, or somewhere in the discharge system.
- Most pumps are oversized because of safety factors that were added at the time the pump was selected. This means that throttling is a normal condition in most plants, causing the pump to run on the left hand side of its curve.
The increased amperage can be caused by a pump that is too large for the application.
- A large pump was specified in anticipation of future needs.
- The pump was sized for the maximum operating condition, but does not run anywhere near that point most of the time.
- The capacity requirement has been lowered and the pump is being throttled rather than cut back the impeller diameter.
- The pump was oversized because of safety factors that were added at the time the pump was sized.
- Increasing the speed of the pump causes a dramatic change in the amperage required. The amperage changes by the cube of the change in speed or impeller diameter. If you double the speed of a pump you will need eight times the amperage.
The increased amperage can be caused by a change in the product.
- The motor was sized for a low specific gravity fluid, but the lines are being flushed or tested with water.
- The specific gravity of the fluid has increased for some reason.
- The viscosity of the liquid is increasing with a change in temperature. Some viscosities increase with a lower temperature, some with a higher temperature.
- The viscosity of a liquid can increase with agitation. That is how cream becomes butter.
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What is the difference between overload trip and over current trip. if there is an overload trip the current will be raised above the set point?
An overload trip is due to too much load on a circuit (for example, my wife running a hair dryer and portable heater on the same outlet). An over current trip is the same thing, but it can also refer to an actual fault condition where conductors have come in contact with eachother/shorted.
A device with a overload protection used to control a motor is a?
A device with an overload protection used to control a motor is an Overload Relay.
It is safe to use 8-3 wire on a 50 amp breaker?
No, it is not safe to use a #8 conductor on a 50 amp breaker. A #8 conductor is only rated at 45 amps capacity. By connecting it to a 50 amp breaker, which would trip at 50 amps on an overload, would overload the conductor by an extra 5 amps. This would be a conflict against the electrical code.
How do you calculate 3 phase motor overload relay setting?
overload model no Ke-FKR4(D)
What is meant by fundamental overload in reference to a receiver?
Fundamental Overload refers to the receiver picking up a source so powerful it causes overload. IE, the receiver is picking up the fundamental output of the functioning transmitter, but is overpowered by it.
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 is pump trip?
A pump trip is when a pump shuts down or stops operation unexpectedly due to a fault or issue in the system. This can be caused by factors such as motor overload, loss of power supply, or mechanical failure. Pump trips can disrupt processes and may require troubleshooting to determine the root cause and restore normal operation.
What is the difference between overload trip and over current trip. if there is an overload trip the current will be raised above the set point?
An overload trip is due to too much load on a circuit (for example, my wife running a hair dryer and portable heater on the same outlet). An over current trip is the same thing, but it can also refer to an actual fault condition where conductors have come in contact with eachother/shorted.
What caues LCD tv to trip off?
The power overload is what causes the LCD television to trip off.
What is thermo overload on a sump pump?
It is an over heat protection to prevent pump windings from buring out
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.
Does mcb trip if a short circuit occurs?
Yes, a breaker will trip if there is a short circuit occurring on the breaker's connected load. The breaker will also trip on an overload condition when the current rises above the breakers trip set point.
How can pump trip?
knowlage
What happens if you overload plug sockets?
the circuit breaker will trip or fuse will blow to open the circuit.
What is the definition of current trip overload or overloaad trip?
i think the meaning of that is a various types of time delay are used for overload trips to ensure that the generator breaks will not open due to a momentary current surge, but only if the excess current persist.....thats all.... :)
Your 1982 Cadillac Deville keeps burning fuel pump fuses you already replaced the fuel pump and fuel pump relay.?
Overload or short in wiring?
What will make the overload switch off on a Goulds 112 hp deep well pump with all new wire circuit breaker and know to be good pump?
A complete answer requires more information. A 112 hp pump is a non-standard size. It's also huge - large enough that it would not be used by a person who needs to ask the question. There is no model number to indicate whether it's a submersible pump or a two-pipe deep well jet pump. If I had to guess, it's likely the pump is only 1/2 hp. Submersible pumps of this size are commonly available either with a controller (3-wire) or without a controller (2-wire). In addition, both configurations may be rated for either 115 or 230 volts. Selecting the wrong controller or failing to install a controller where required will cause the overload to trip. Virtually all jet and submersible pumps use a start capacitor connected to a start switch or relay. If either component is missing or failed it will also trip the overload.
