isplay. This has been periodic but is becoming more prevalent. Any ideas on the cause?
Sport & Outdoor – Others

Experienced athletes share their insights in answering this question:
Hi,
You have a loose wire somewhere in the control… when the vibration of the machine starts the loose wire makes it go nuts… You could try to take it apart… some will come apart easy and others not…may just be a loose ribbon connection.

heatman101

## How to Identify and Resolve Common Issues ?

We offer a diverse range of insights on identifying and resolving common problems in sports. Our sources encompass academic articles, blog posts, and personal essays shared by seasoned athletes. :

Stepper motors are DC motors that move in discrete steps. They have multiple coils that are organized in groups called “phases”. By energizing each phase in sequence, the motor will rotate, one step at a time. With a computer controlled stepping you can achieve very precise positioning and/or speed control.
However, if the primary space limitation is motor diameter, engineers can increase step-motor torque within a given frame size by increasing the motor`s length. To build a step motor with higher torque, several rotor and stator sections are “stacked” together, thus the increased length.
A Stepper Motor or a step motor is a brushless, synchronous motor, which divides a full rotation into a number of steps. Unlike a brushless DC motor, which rotates continuously when a fixed DC voltage is applied to it, a step motor rotates in discrete step angles.
A stepper motor is an electric motor whose main feature is that its shaft rotates by performing steps, that is, by moving by a fixed amount of degrees.
Stepper motors are controlled by input of electrical pulses, such that the speed of motor rotation is proportional to the input pulse rate.
The power of a stepper motor is regulated by the input voltage and the current. The current can be adjusted by setting the reference voltage (vRef) using the trimpot, which can be measured by placing a multimeter + side on the trimpot and the – side on the SD card reader.
A brushless DC motor in which a full rotation of shaft is divided into equal steps is called a stepper motor. A type of electric motor which uses DC power to produce mechanical energy is called a DC motor. Stepper motor is a brushless motor. DC motor may be brushed or brushless motor.
Efficiency. Being a more “mature” technology, DC motors are moderately efficient, running at around 75 to 85 percent efficiency. On the contrary, stepper motors are low efficiency. They lose a lot of energy due to heat, and since they draw maximum current, they tend to burn through energy rather quickly.
A 5-phase stepper motor has 10 poles, so two poles per phase. The rotor and stator construction of a 5-phase stepper motor means that each pulse of current moves the rotor by 1/10 of a tooth pitch, for a step angle of 0.72°.
Three-phase stepper motors are useful in applications that require very-high resolution (micro-stepping) as well as minimal noise and vibration. This TIDA-01362 design achieves all of these requirements by driving a three-phase stepper motor using Texas Instruments DRV8313 brushless DC (BLDC) motor driver.
Standard hybrid stepping motors have 200 rotor teeth, or 200 full steps per revolution of the motor shaft. Dividing the 200 steps into the 360° of rotation equals a 1.8° full step angle. Normally, full step mode is achieved by energizing both windings while reversing the current alternately.
Stepper motors are controlled by a driver, which sends the pulses into the motor causing it to turn. The number of pulses the motor turns is equal to the number of pulses fed into the driver. The motor will spin at a rate that is equal to the frequency of those same pulses.
Fundamentally, the basic method of controlling a stepper motor is energizing and de-energizing the coils that surround the gear in the correct sequence. Varying the sequence and timing of the coil activations is how engineers customize the operation of a stepper motor to the needs of their applications.
Speed of a stepper motor can be controlled by changing its switching speed or by changing the length of the time delay loop.
The stepper motor is a digital input-output device. It is particularly well suited to the type of application where control signals appear as digital pulses rather than analog voltages. One digital pulse to a stepper motor drive or translator causes the motor to increment one precise angle of motion.
Any stepper motor can be used as a generator. In contrast to other generators, a stepper motor produces a large induced voltage even at low rotational speeds. The type used here, with a DC resistance of 2×60 Ω per winding, can generate more than 20 V when turned by hand, without any gearing.
Another mechanical adjustment to gain accuracy in your stepper motor is to use a smaller inertia load. If the motor is attached to a large inertia when it tries to stop, the load will cause some slight over-rotation. Because this is often a small error, the motor controller can be used to correct it.
You control the stepper by energizing one coil, then reversing its polarity, then doing the same to the other coil. To do this, you can use a dual H-bridge driver like the TB6612FNG that you used in the DC motors and H-bridge lab.
There are two ways you can control the speed of your stepper motor. You can either decrease the delay time between each step or you can adjust the size of the step the motor takes. Decreasing the delay time is straightforward, just lower the delayMicroseconds and the stepper motor will have an increased step rate.
As discussed earlier you have to rotate the potentiometer to control the rotation of the Stepper motor. Rotating it in clockwise will turn the stepper motor in clockwise direction and vice versa.
The most common and easiest way we can power an Arduino board is by using its onboard USB connector. The USB connector provides a regulated 5V line to power the board`s electronics. However, 5V from the USB connector can also power external components through the 5V pin that can be found in Arduino boards.
For a stepper motor, the 4 terminal pins on the H-Bridge should connect to the 4 leads of the motor. The 4 logic pins will then connect to the Arduino (8, 9, 10, and 11 in this tutorial). As shown in the Fritzing diagram, an external power source can be connected to power the motors.
Stepper motor systems are highly efficient when producing torque, but lack operational efficiency when not producing torque. Applied Motion Products offers insights on how to make a greener and more efficient stepper motor system by simply closing the current loop.

ANSWER : Get to the manufacturer

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My swimming pool. I have just had my fifth IC 40 Intellichlor chlorine generator installed in 4 years at a cost of over \$900 today. Each one has worked for no more than 8 months. The first three were replaces under three year warranty, the fourth by a factory rep and I bought the fifth today. The first three all failed with Flow Chk PCB error message. The fourth just stopped working on Sunday, no power or lights. A local Pentair warranty person, whom I paid a Service Call, unplugged the unit, opened the small power center cover, showed me the green light indicating that there was power, plugged in a new IC 40 which worked immediately (as did the other four). I asked if I should replace the power center and he said that it’s basically just a transformer and is working fine. We do get occasional power blips that make the clocks on microwaves, etc blink, but I thought that the power center essentially isolates the cell from these. I do have a Florida Power and Light surge protector on the electrical box that brings power into the house. I have now talked to the pool builder, two Pentair warranty repairmen and one factory rep. I am at a loss. They all tell me they have no idea why these units fail after less than a year. This last IC 40 was installed 3/24/2010, version 2.0 and now failed in less than 5 months. Should I replace the power center that the IC 40 plugs into. Any other suggestions. I have been told that this is the best chlorinator. I don’t want to keep replacing units. By the way, each unit had been spotless inside. I keep the water chemicals and salt levels at ideal levels. The units have never worked long enough to get dirty inside. The power center is connected to an Intellitouch control system outside with an indoor control panel. Last time I called Pentair North Carolina and got some smart alec tech person that had no suggestions. Please Help if you can.
ANSWER : I’ve had the same experiance. On my fifth one as well. Fail every year. No idea why.

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Lifted weights don’t go back down properly – they snag
ANSWER : The leftovers you found go in the pole underneath the first weight (the one on top) so 1 weight is always locked, this weight needs to be attached so the bar returns to it original position.

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I have a multifunction sports watch that i bought from Big W, (no brand name)

By accident i set the watch to 24 hour time, originally it was set to 12 hour time, how do i set it back? ive tried every button combo including the button combo i used when i accidently set it on 24 hour time, the instructions only say how to set the time and date, it doesnt say how to toggle between 12 hour and 24 hour time, is there a generic way to toggle it on sparts watches? btw, holding the mode button in does nothing on my watch, no matter how long i hold it in for

ANSWER : Hi. How may buttons do you have, 3 or 4 buttons?if you have the 4 buttons, try this:You need to go through the time and date settings again. The 24 and 12hr format select is at the end of time/date adjustment.To set the time and date:-press the top-left button then right-top button to set the seconds, press bottom-left button to set hour then press top-right button to adjust hour, press bottom-left button to set the minute then press top-right button to adjust minute. To set date, press the bottom-left button then press top-right button to adjust month, press bottom-left button then top-right button to adjust day and finally press bottom-left button to set the time format then press top-right button to select 12hour format. Press top-left button when done.Since you have a generic sports watch, it is hard to write specific instructions to set the time format. If your watch has different ways of setting the time, just remember that the 12/24hour format is usually at the end of time and date adjustment.Let me know if you have questions. Good luck.

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Suddenly stops recodring
ANSWER : I love my Sanyo mp3 recorder I’ve been using it in church for 4 or 5 years. It never quits it can hold an extra gig with a chip and i can plug it into my computer to upload it in seconds. I say replace the old recorder

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My 1977 Evinrude 140 HP outboard engine looses power when it hits @4,200 rpm’s and goes down to 3,500 then back up to 4,200 and then back down to 3,000 or about there. This would continue if I didn’t slow down to 3,000 on my own. It runs fine at @ 3,000 when I slow it down. I have changed all the fuel lines from the fuel tank to the carbs, removed, cleaned out the fuel tank, put new gas and added a can of SeaFoam. I replaced the water seperator filter and cleaned the fuel filter. I feel the fuel pump is operating OK. Any ideas about what could be causing my problem? Could it be a bad power pack or stator? Help!!
ANSWER : Hi, this is obviously a stator problem since you have cleaned the fuel filter..

Take care

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I just bought a brand nbew ww54 weight watchers scale but not matter what I do it’s not giving me the right weight (65 to 70lbs, I’m 180) and always reads ERROR for the body analysis measurements???I followed the instructions and even had someone else follow the same instructions and got the same. I put a new battery in, no change! Used a level to make sure the floor was level, no change! My feel were completely on electroydes no change! Most I’ve ever spent on a scale recommended by weight watchers and I’m so dissapointed.
ANSWER : Did you make sure it was set to lbs instead of kilograms?

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