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  1. robertl

    3 phase 2 speed motor from single phase

    Hello everyone I have just bought a new lathe, (used) its on its way to me from other end of the country now. I have only just realised i may have an issue. The machine is 3 phase and i was intending to go down the VFD route but because its a dual speed motor im not sure i can. See attached...
  2. D

    AC to DC motor thyristors speed and direction control

    So i have been given this question: You have also been asked to produce a circuit design that can control the speed and direction of a conveyor with a AC to DC motor thyristor system. What are the the operational features (how it works with speed and direction circuit diagram/s) I am really...
  3. D

    Transistor H-bridge system for a conveyor motor with speed control property's

    Hey, I've been asked a question 'what are operational systems on Transistor H-bridge system for a conveyor motor with speed control property's'. I know that system I've put below would work for a lower voltage application, I just cant seem to find any information on high voltage applications. I...
  4. R

    I would like some help to bypass a touchscreen climate control (strictly fan speed and vent settings (eg, floor/dash).

    I would like some help to bypass a touchscreen climate control (strictly fan speed and vent settings (eg, floor/dash). Background - 2003 Acura mdx. For some idiotic reason Acura designed the climate control fan speed and vent configuration into the touch screen. Not a terrible thing but...
  5. S

    125 HP motor speed problem

    We have a 125 HP motor. After rewinding, it runs at low speed at full load, but runs at rated RPM at no load. Any ideas why?
  6. happysteve

    Brushless motor battery drills - unsatisfactory speed control, or just this model?

    Have had a Makita BHP458 (non-brushless) hammer drill for years, I love it, it's pretty indestructable and the torque's great, but the chuck's finally going. They seem to be moving to brushless motors now (for most of their combi drills). I've only recently bought a battery SDS drill (after 2...
  7. E

    Can anyone help me identify the 3 speed coloring of my cooker hood connection. Please look at the photos

    Hi Can someone help me please? I got a new cookerhood motor and I know the color coding for different speeds. But I need to find out the existing speed color coding to to connect to it. Could someone look at the photos and tell me which color is which? Its a 3 speed setting. Thanks in advance.
  8. J

    Would having upstairs/downstairs rings on same rcd speed up powerline adaptors

    Hi i'm trying to get the best speed i can from powerline adaptors scattered around the house. between the downstairs ones the speed is 784mbps, however to the upstairs ones only get 40mbps. i've eliminated all the interference i can around the house that was affecting the speed. if the upstairs...
  9. S

    Fan and speed controller

    Hello, I am new to this forum and recently have built a vaulted ceiling kitchen extension , I have run 2 4 inch flat duct from the kitchen across the vaulted ceiling into the existing loft space I have also ran a 3core +e to the loft from the kitchen island for a speed controller .. what I...
  10. Darrin Brand

    Inverter speed control help

    Can any one help ? Emerson command sk I've got a 3ph motor from a boilie making machine that has the above attached to it , I've reset the parameters to factory and input the motor parameters to the relevant fields but still can't get it to work , it's alternating between a tr01 fault or a...
  11. Ironbones

    Commercial DC circuit breakers VS semiconductor fuses high speed.

    Hi all. Just to start off still learning. Could any one help me with this and put me right if I am incorrect. I would like to understand the preference or reason for opting for DC breakers or semiconductor high speed fuses, when been used in low voltage DC circuit. I understand that...
  12. N

    Can I use a speed controller with this fan

    Just wondering can I install a speed controller on the fan below. I want to make a homemade air filter but its a huge fan. If so do you know suitable spec'd ones. Thanks im2501480 - (New models have them built in)
  13. S

    2 speed hood fan wiring

    Hope someone can help I’ve removed a 2 speed extractor motor from cooker hood with 4 cables: white, blue, black and orange. Unfortunately the replacement motors cables are white, black, brown and red. Can anyone advice on how to wire the new motor in
  14. L

    Better speed control required for 24v dc mobility motor

    Hello all, hope this is posted in the right place. You'll probably guess after reading this post for help that i'm not an electrician! I've built a 4-wheel buggy utilising a mobility scooter motor and wish to slow down the acceleration rate. I am utilising the twist grip throttle from a...
  15. G

    Pedestal Fan - bypass speed control unit - Direct connection

    Hi, The speed controller on my pedestal fan is broken and I thought of bypassing it by connecting the power supply directly to the fan motor. When I opened casing, I found two wires (Blue and Brown) coming in from the plugs end and four wires (Red, Black, Blue and White) coming from the motor...
  16. O

    UK Speed Limits for vans ....................

    OK, hands up if you weren't aware of these : Speed limits - I wasn't! Not been stopped yet!
  17. E

    if i could run faster than the speed of light...

    if i started running from where i am now faster than the speed of light could i bump into myself and trip myself up before i begin running?:runner::runner:
  18. D

    Bmw Speed sensor pulse wire

    As above, I purchased a front parking sensor kit for my BMW f20 118d 2012. The system requires connection to a speed pulse wire to activate the sensors below a certain speed. Does anyone know what colour wire it is and where is the best place to tap in to it?
  19. A

    help with a fan speed controller

    Hi guys I'v got a question to do with a fan speed controller. it is Ziehl Abegg 560 mm, single phase. use electronic speed controller 6 amps..just replace a new same fan motor, when lower speed, controller temperture go up 30mins fuse(10amps)blow. when high speed , controller normal.. any...
  20. Mike Johnson

    Variable speed Pool pumps, France

    A lot of guys around my area of France have spent over €1500.00 on variable speed pumps for their pools, the saving on electrical consumption can be quite considerable over a year, but the cost of the pumps against a standard pump at €400.00 seems to beg the question can't a controller be used...
  21. Gary Tollison

    Can a dimmer switch be used to control drill speed?

    Hello As the title says... ;) I'm thinking about having a 1.8A 400V bushed fixed speed drill, mounted in a press, connected to a dimmer switch to control the drill speed. Any ideas, or advice? And please, to those who think I'm silly to think such an idea etc, I can do without the criticism...
  22. Gavin John Hyde

    Drunk Electrician Caught Sawing down Speed Camera

    Saw this and found it quite funny... Anybody know the plonker.... His name is Stuart Langley from Reading I have done daft things when drunk but never tried to cut a Gatso down... Drunk Electrician Caught Sawing down Speed Camera | WiseTradesmen -...
  23. joel89

    2 speed Pole changing motor Circuit 1.5kw

    Hi all, I have got to build a small panel for a overhead crane long travel drive motors (Old Street crane) The motor is is a 2 speed pole changing motor 750rpm and 1500rpm it needs both slow and fast speed and it also has a link between across 1ph of the slow and fast winding in the motor...
  24. R

    Speed control of power tools ?

    I'm looking for a device that can plug in line with a 16 a extension cable that will control the speed of brush motors on power tools, up to a 2000 w angle grinder. I have seen PCB units on eBay but I'm not sure which one would be suitable. It would be ideal if it could be switched between 240...
  25. S

    Spray Booth fan help.

    HI! could someone tell me the the correct circuit for a spray booth fan.What would be better 2 pole or 4 pole motor? (Single phase only) Also i would for example, need a DOL starter for that and a AC speed control to vary the speed. Its a inline axle fan 700mm diameter. If any one could give...
  26. R

    3 phase motor Question

    Evening Guys, A commercial customer of mine has asked me to price a manual and a programmable speed controller for an existing ventilation motor. At the moment the motor is started and stopped manually. I have no expertise in this area so some advice would be greatly appreciated. The motor is...
  27. W

    Hrc fuses

    The question is : Is there a difference in the protection characteristcs of a semi-conductor and a high speed hrc fuse can any one help
  28. K

    Commercial replacing 3 phase motor

    people ... quesion ..... there was a car lift , that is old ...and it was 3 phase driving a hydraulic pump to move up..gravity down.. this motor was a 1.5Kw motor 3 phase.. the lift was moved to a domestic garage , so no 3 phase supply in house .. the motor was replaced with a 1.5Kw single...
  29. T

    Hi... need some help with this circuit connection

    Hi everyone. My name is Tim and I need some help. I am looking at a motorised pack I am using to clean windows. I want to add a variable resistor, I think they are called potentiometers. I am wondering though, where should I put it and what value should I get? I think maybe 100 OHM? Hope the...
  30. D

    Commercial Drilling Through Copper Bus Bars

    I recently spent roughly an hour drilling through copper bus bars, surely there's an easier way to do it? :ack2:
  31. S

    trainee in need to help

    hi im a trainee in need of help! im revising for my 309 science and principles exam and i have some revison questions im going through, the first one i could do with a hand with is: "describe briefly how electronic devices may be used ina a motor speed conrol unit" many thanks fro any...
  32. J

    SKY Customer Services

    I've been signed up with SKY for the past 11 months, I get my phone line, TV & broadband through them. When I took out the package they promised me the world and were very helpful but after about a month my broadband speeds slowed down to less than 1 Mbps. I emailed them and they said it's...
  33. Clive P

    3 Phase Bandsaw.

    HI, Just about to post and I noticed a similar thread, anyway here goes. Not worked on motors or controls for some time so after some advice. A friend of mine has just got his hands on a 3Ph Startrite 352 Bandsaw, yes; you're right only a single Phase supply available. At the moment it is...
  34. joel89

    JIB Electrotechnical Certification Scheme (ECS) one for tony. demag jib hoist

    heyup tony, stripped one of our demag jib hoists down suspect contactor welded in, and i have found what appears to be a double "coil" contactor A1 , A2, B1, B2. the motor is a 2 speed hoist, with another contactor mounted at the side 2phase in from the double coil contactor dead side and 4...
  35. S

    Commercial canopy fan help

    Hi i have a canopy fan to wire up the problem is a 3rd party has left no wiring diagram for it. It will be working of a speed controller which has the connections N L E U1 U2 1 2 . The Fans make is RUCK Ventilation DVNI 500 E4 Single phase it has 5 conenctions at the isolator. It is numbered...
  36. N

    3 Phase motor on AHU

    Hi everyone. Have a problem iv not come across before. So the motor has stopped running on the AHU in our building. It's controlled by an inverter. First thing I done is check the inverter was running (which it was), then checked for voltage at the motor terminals. To my surprise (and probably...
  37. P

    Industrial Ceiling Fans - Speed Control Issue

    Hi Guys, I have two ceiling fans and a speed control unit which switches on the fan and allows you to control the speed of the fans. Speed Control Unit Model is RV-05 2A max, 480W - with Forward / Reverse and OFF switching. I only have T&E from the switch to each fan (2 x Switched Lives which...
  38. G

    remote switching between star and delta (both ways)

    Hi all, I apologise for jumping straight in with a new thread asking questions. I did search and can't find any info on my problem. Getting to the point... I have fitted an ABB EXE2S star delta starter to run a 3phase 15kw motor on an extraction fan. The starter is working perfectly but the...
  39. R

    Another RCD tripping

    Will a RCD trip if there is a problem on the cable drawing no current ? I plug in a tumbler drier and power it up, the RCD trips Remove the drier plug and try the drier in another socket. The drier works without tripping the RCD. I try my electric drill in the socket that tripped the RCD...
  40. P

    bench mounted pillar drill running at a reduced speed even when its not under load

    hi guys, We got a bench mountepillar drill, which is running at a reduced speed even when it is not under loadconditions.what could be the fault?
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