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Electrical Troubleshooting
Electrical troubleshooting involves checking and resolving an electrical problem (such as when an electrical device stops working correctly). Common troubleshooting practices include checking if the power is on, the bulb has burnt out, or the breaker tripped.
885 Questions
Is there another way to reverse star delta then swap two phases?
Yes, you can change the diode configuration. a diode will only let electricity flow in one direction. See also Delta- Y, and whetstone bridge.
How do you control hvac system from the computer?
First write a simple document that describes your goal; what do you want the control system to do. In a large scale computer control system that would be called the "functional specification".
next you will need sensors and computer controlled relays to control your AC from your computer.
Several manufacturers provide RS-232 Digital relays, and although there are, in fact many manufacturers, I have used the relays and serial data acquisition modules from B&B electronics and have found them to be of good quality and relatively inexpensive. Other manufacturers provide industrial rated devices that are much more expensive.
After selecting the digital I/O control equipment that you will be using, then you can create the computer program that communicates between the different devices and provides the functionality that you want.
After selecting the hardware, it's a good idea to resurrect the functional specification and start to fill in the specifics, for example, if you wrote in the functional specification that you want to turn on the fan motor, that's when you would determine the sequence that you would send to the data acquisition module to turn on the fan. This step saves a lot of trouble later so that you don't need to re-write segments of code because of a surprise that you encountered when reading about how to turn on a relay. In a commercial system, that document would be called a "detailed system design".
Once you've gone that far, just connect the equipment and write the code.
Have fun.
Why does a motor home shock us when entering?
Does this only happen when you are plugged into external power or on a generator?
What is a De Sauty's bridge and give explanation about it?
De Sauty's bridge is an electric component that provides a method for making a comparison between two capacitors. It measures the values in terms of a standard capacitance.
Start by checking all of the fuses in the fuse block. There is a good chance that one of them has blown.
What would cause new batteries to run down?
The first thing that comes to mind is circuit leakage. There is something in the circuit that is not disconnected when the circuit switch is turned off. This can be checked by placing a DC amp meter in series with the circuit directly at the battery terminal post. Operate the circuit and make note of the current flow. Now shut the circuit off at the switch and see if you get a reduced reading. If there is a reduced reading then there is something else connected to the circuit ahead of the switch. Batteries will also discharge when stored on a concrete floor. Always store batteries that are not in use on a wooden shelf or if they need to be on the floor make sure that you use a 2" piece of blue high density builders Styrofoam to place the battery on.
What are start and run windings of a motor?
Start winding determines the direction of rotation.
Start windings are considered "secondary windings" and run windings "primary". Usually, the start windings disconnect from the power circuit and dry film capacitor(s) at about 75% of the motors full speed. There are some motors with oil filled capacitors that keep the secondary "start" windings in the power circuit but only disconnect the dry film caps. The primary "run" windings are always in the power circuit. There are more, could write a couple of pages on the whole workings.
What are the defects if the bulb didn't glow?
Feeder circuit voltage has been turned off, internal circuit fuse could be blown or filament in bulb burned out.
Can you use a 16 or 18 volt battery in a 14 volt ryobi cordless drill?
Absolutely not! It is a 14 volt drill. Use a 16 or 18 volt battery will destroy the drill in short order. It will run but not for long.
What is a bad connection in an electrical circuit called?
"A wiring fault" which - depending on the actual behavior of the bad connection - might also be described as "an intermittent fault", "a high resistance fault", or a combination of all three terms.
For example: "An intermittent, high resistance wiring fault".
Why does one bulb in a fixture blow out?
One possible reason is arcing inside the lamp socket. Loose bulbs can arc inside the socket. One sure sign of arcing is if the light "flickers" when it is on. Take the bulb out of the fixture and examine the contacts on the base. If any part of the base appears burned, there is arcing inside the socket. Arcing can cause a bulb to blow prematurely. Make sure the bulb is tight when istalling a new one. The best cure is to replace either the socket if it's removable, or the whole fixture if it's not. Also if it's an enclosed fixture, the heat from the light bulb can get trapped inside, causing the bulb to overheat, thereby causing it to fail prematurely. This is likely if you have too large a light bulb in the fixture, i.e. using a 100 watt bulb in a fixture designed for a 60 watt bulb. Try a lower wattage bulb.
Electricity Meter. I've never heard that term. The other terms are also foreign to me and I have been using measuring equipment for over 40 years. I have never seen a meter that will actually show kWh. An electrical USE meter (like what is on your home) shows kWh used. More explanation in the question would help.
- If you are referring to a megohm meter, it is a test of the insulation properties of such things as electric wiring, motor windings and high power antenna mounts.
We use a "megger" or "meg out" electrical wiring and equipment to see if it is shorted to ground in any way.
The megger uses much higher voltages to check resistance than a normal Volt-ohm meter.
Ideally, you want infinity resistance but I've installed 460 volt motors with 750 meg ohms resistance to ground and had no problem.
- On the whole megger testing is non destructive. What happens is a DC voltage is applied to the device or winding under test. It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it.
On my megger there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to not damaging the device you are testing.
Working voltages up to 240 volts should use the 300 range.
Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range.
As you can see if you used the 1000 volt range on a device that had a working voltage of say 24 volts you could damage the insulation just by testing it. So meggering a device is non destructive if you use the tester as its instructions tell you to.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
What happens when hooking 2 9 volt batteries together?
IF you connect the Negative terminals together, AND the Positive terminals together, then nothing happens other than creating a 9 volt battery capable of providing twice the current [measured in Milliamps (mA), or Amps (A)].
On the other hand, IF the batteries are connected with the Positive terminals to the Negative terminals of the other, THEN you will have created a very serious and possibly hazardous condition!!!!!
When connected in this manner, the full current of both batteries flows, basically a full short circuit condition, and both batteries will very quickly heat up to the point of self destruction, and very likely to explode.
Even it they do not explode, they will certainly become hot enough to severely burn you, and start a fire if they are in near proximity to anything combustible.
Therefore, DO NOT interconnect any batteries, with both of their Positive terminals to the other's Negative without a load [electricity using device within the the circuit] to limit the current flow.
If you connect the positive terminal of one battery to the negative terminal of the other and then put the load between the remaining positive and negative terminals on each battery you then have an 18 V battery. This is connecting the batteries in series.
They are a ripoff but you get about $55 in tools are resistors and juke for $500. I could buy everything in the crap toolkit for $55.
What type of electric motors are used in cocoa processing factories?
Standard Induction Motors for general applications. Servo motors in case precision application like packing
Wiring diagrams for '93 ford ranger?
You can find a wiring diagram for your truck online. Autozone.com gives you access to free online repair manuals. You just enter your vehicle information and log on and you can use them anytime.
Can a generator be installed indoors?
Yes, many generators are installed indoors. Any where that requires standby power have the generators in a room especially designed too accommodate them. Hospitals, sewage treatment plants water treatment plants to name a few all have generator backup. The major consideration when generators are installed indoors is that they have the proper ventilation. A full free controlled flow of outside air for cooling and combustion purposes is a must. The most important aspect of an indoor generating system is the venting of the exhaust system to the outside of the building in which the generator is housed. This exhaust system should not be in close approximation to the incoming flow from the outside cooling air. This is to prevent carbon dioxide from the engine's exhaust being drawn back into the building.
The NM represents the type of sheath on the cable. NM stands for Non Metallic sheath cable..
Where does the white wire connect on a six volt battery?
You don't say what you are connecting to the battery. If you have a black and white wire the best guess would be white to negative terminal and black to positive terminal. If you were connecting a 6V light bulb it really doesn't matter.
Can anyone locate wiring schematic for 47546 security tv camera?
Can anyone locate wiring schematic for 47546 security tv camera?
White=ground
Yellow=Audio Tip
Blue=Video Tip
Orange=V+ (7.5vdc)
How can you test a transistor?
Next, for NPN transistors connect the ohmmeter's positive lead to the base. Briefly touch the other meter lead to the transistor's Collector, then to the transistor's Emitter. Both connections should show a low-hm's reading: a diode-type connection. Then, connect the meter's negative lead to the transistor Base, and again touch the other meter lead to each of the other transistor pins. The meter should show open circuit or infinite ohms on both pins, indicating reverse-biased diodes.
If the transistor is PNP, just reverse the meter leads to perform the above tests. Touch the meter's negative lead to the Base pin, then verify that the Emitter and Collector pins behave as "turned on" diodes. Touch the meter's positive lead to the Base, and verify that the Collector and Emitter are acting like turned-off diodes.
Testing for "transistor" function, locating the EmitterIf you use your wet fingers as a resistor, sometimes you can use your ohmmeter to check for amplifier function, and also detect which pin is the emitter.First test for diode function in order to locate the transistor's Base pin. Connect your ohmmeter between the other two pins (no connection to Base, yet.) Wet your fingers and touch the Base at the same time as one of the other pins. Note the ohms reading if any. Then touch your fingers between Base and the other transistor pin. Was one ohms reading much lower than the other? If not, then reverse the ohmmeter leads. Then touch your fingers between Base and one pin, then Base and the other pin. When you find one ohmmeter reading which is much lower than all the others, then you've located the proper polarity for transistor amplification. During the lowest ohms reading, your wet fingers were connected between Base and Collector. The other transistor pin then has to be the Emitter. (You can also perform this whole test more reliably by using a 1K resistor in place of your wet fingers!)
Testing an FETIt's a bit more difficult, but FETs can be tested using an ohmmeter, a 9v battery, and wet fingers. (During low-humidity winter weather, when high static voltages are present, you might want to wear a grounding strap!)First let's test for correct operation of a common N-channel depletion-mode MOSFET. Connect your ohmmeter between the FET's Source and Drain pins, with the positive meter lead on the Drain. While watching the ohms reading, touch the 9V battery's negative terminal to the Source or Drain, then use your wet fingers to briefly connect the battery's positive terminal to the transistor Gate pin. The ohms value between Source and Drain should become low. Remove the battery and briefly touch your wet fingers between Source, Drain, and Gate. The ohms reading should go high again. You've just applied and removed a charge to the floating Gate pin, switching the transistor on, then off again.
For testing a P-channel FET, just reverse all the polarities. Connect the ohmmeter to Source and Drain (positive meter lead to Source.) Use your wet fingers to touch the battery's negative terminal to the Gate pin (with battery positive touching Source or Drain.) That should make the ohms value go low.)
NOTE ON ALL OF THE ABOVE: I assume that the transistor is disconnected from any other circuit. If your transistor is soldered into a circuit board, most of these tests won't work.
Why does a 1996 Saturn sl 1.9 sohc shut while driving or ideling for 10-15 mins?
check the ignition model the hind coil packs.when the ignition gets hot it does not send spark to the coil pack.
