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speed

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  1. 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...
  2. J

    3 Phase Motors Speed Control

    Hi, Does anybody know of any alternative to governing the speed of a 3 phase motor than a frequency inverter? Thanks in advance, Jamie
  3. 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...
  4. A

    Average Speed Cameras

    Anyone know what its all about! I drive at 50mpg through them all the time on motorway and numerous amounts of times i see people FLY past me must be at like 70-80mph.. How do they get away with it what am i missing? Do these only work at certain times? Do they actually work? What am i missing...
  5. calpol91

    2 way speed potentiometer

    Hi guys... Just been to have a quick look at a job, literally had 2 mins to have a gander as its a last minute job and they were closing... They basically want a stop/start at the other end of the conveyor (theres already one at the end naturally) and to accompany that, a second pot to control...
  6. 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?
  7. A

    Need advise on controlling the speed of a motor.

    Hello there I need to control the speed of a drill for a project. Instead of using the trigger I need to use a dial (like a dimmer switch) to control the speed the motor turns at. I will be using this drill - Powerbase 550W Hammer Drill from Homebase.co.uk Will this control unit work...
  8. R

    Which type of Speed Controller required for 3-phase motor

    Hi all Client requested speed controller for 3-phase/4KW/7.9Amp motor running extractor fan to spray paint booth in local car mechanics Have been advised I require SYSTEMAIR RTRD 14 SPEED CONTROLLER VSD VFD IMO INVERTER DRIVE FREQUENCY Reconditioned and load tested unit available at £240.00...
  9. F

    Max wind speed on roof?

    Hey guys can anyone clarify for me the safe working wind speeds for working on roof? All i can find is 17mph but this is for roofers and scaffolders and not specific to PV. Anyone? Thanks in advance :tt1: Fiardor
  10. G

    High/Low Speed 3 Phase Fan Contror???

    Hi I've been asked to move 2 x 3 phase fan control boxes with high and low speed start buttons, stop buttons and LED indicator lamps. They control 2 roof fans. Inside one of the boxes the coil has gone on one of the contactors and needs replacing, but to be honest both boxes are quite old now...
  11. T

    Advice - vary speed of 240v 18w 80mm fan

    Morning everyone! I would really appreciate some advice please. I've bought a small 240v 18w fan to help circulate air in plastic box used for drying food (biltong!) Could someone advise me on the best way to vary the speed of the fan? all the fan controllers I've seen dont seem to work on...
  12. D

    generator speed light

    A customer asked me to install a foolproof way of making sure his generator is running at the right speed. The single phase generator is located on a farm and is connected to a tractor by a pto shaft. Previously they set the tractor at around 1000rpm and went and checked that the lights were...
  13. J

    Speed Hump

    Anyone know of any company's where i can purchase a Solid speed hump, that can be fixed to the ground, and conceal a 2.5mm 4core SWA?
  14. Dan

    Forum Slow Speed?

    You may notice that the forum lags a little at peak these last few weeks. Basically, we've outgrown our existing server. I ordered a brand new fresh one in November and we've been testing it and configuring it with the lesser important forums since then and we're ready to roll with it. I've...
  15. the pict

    speed controller

    Can anyone reccomend a motor speed controller for a commercial kitchen cooker extractor, nothing fancy, no need for air volume sensors or tacho outputs just a single phase with pot, 16 to 20 A Pict
  16. S

    Petrol generator frequency

    I'm considering buying a used petrol generator but there seems to be some confusion as to what the output frequency is, 50 or 60 Hz. Is there any way of finding out the output frequency of a generator? If it did turn out to be 60 Hz, could it be changed to 50 Hz, and if so, what needs to be...
  17. K

    High Speed Rail.

    I didn’t want to put this in Chit Chat because I think it’s to important. The HS2 rail link (London / Birmingham) is under threat due to the NIMBY’s as per usual. It may spoil the views around Amersham and go through the constituencies of two Tory MP’s. As to the views, it’s got to be some of...
  18. malcolmsanford

    Gary Speed

    Someone just emailed me that he past away, possible suicide, what a great shame such a young lad .................whatever RIP
  19. P

    Faster than the speed of light

    http://www.telegraph.co.uk/science/science-news/8901001/Speed-of-light-broken-again-as-scientists-test-neutrino-result.html anyone up for some time travel :) beats going to the moon
  20. L

    Speed Control of Motor using SCR

    Hi, Does anyone know a good link explaining how the circuit shown in the attached document works? It is used to control the speed of motors using Diac and Triac. Many Thanks Leena

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