star delta

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  1. G

    Star delta issue (driving me insane)

    Heeelp! I have an 11kW/21A motor which is attached to a hydraulic power pack. I have replaced the old panels with new, using the same star delta starting. When connected to a 415V outlet protected by a C32 breaker, the breaker will periodically trip. This has only manifested since the new...
  2. mxj262

    Star Delta Starter 400KW Crane Motor

    Hello Dear friends, I am going to check a start delta starter for a motor(400KW) which is used for crane and lately it has been causing some issues (Voltage Drop) not sure if the voltage drop is always there once this is started or it goes back to normal this information was not provided. Will...
  3. U

    Star delta Pump motor - Doesn't work clockwise but Works anticlockwise

    Hi I'm having a problem with a 20 HP pump motor from a hydraulic press to try molds. When we energized the machine, it starts with star correctly but when it changes to delta, pump motor stops. The breaker doesn't strip and fuses were ok. Video (clockwise rotation)...
  4. S

    Star Delta Starter, Blowing Contactor

    Hi there, I got a call to a job, table saw (wood) tripping C/B straight away. 4kW motor on Star Delta Starter. So I get to the job, after some investigation I find that the main contactor is welded shut and there is a phase to phase short circuit, I find that the motor tails to the windings...
  5. M

    Star delta motor overload

    Hi I got called out to a faulty star delta starter on an old Stenner band saw Monday (was getting stuck in star and blow fuses) - So I ordered a new one to suit the 22kw 400v motor having calculated the overload to be 22.04A going by the plated current saying 38A. 38*0.58 Fitted it all today but...
  6. E

    Star delta motor stuck in star consequences

    Hi Guys, Is my understanding of why it is bad for a star/delta motor to be stuck in star correct? 1) Star delta starting is used as a method of starting larger motors at a reduced voltage of root 3 , which reduces the large starting current drawn by the motor during start up, therefore...
  7. T

    Troubleshooting on a star delta starter

    I've got a call about a pump that is not working. It was a 30 kw motor with a star delta starter. The motor start but before it changes to delta it trips. And it look like the motor is single phasing. So i disconnect both cables at the motor and start it again. As soon as the delta contactor...
  8. H

    two motor star delta

    hi guys i have an issue with one of two motor running star delta for a concrete mixer one motor is pulling out more current than the other one almost 10A difference (1st=39 , 2nd=48) knowing that the 2nd is rewinding both motor are same company
  9. I

    Star Delta motor problem.

    So I have a 55kw Star Delta starting motor. The motor was moved about 10feet from original position so I had to put new cabling in from Isolator to Motor. That's all was changed. When I went to start it it blew a fuse when kicking into Delta. Changed fuse and it happened again only this time it...
  10. dlt27

    Motors and Star Delta Question

    Hi and thanks for any replies. I am predominantly an install electrician and don't have a lot of experience dealing with motors so any help would be greatly appreciated. I have been asked to connect a CNC machine, a dust extractor and a pump. The CNC is straight forward as it is just connected...
  11. T

    Control Panel Star Delta Starter

    Hello all. I’m after a bit of advice. Daft question I’m sure but when wiring a star delta starter in a panel is it necessary to use the electrical interlocks, i.e for the coil of the delta contactor, would you take the wire through the N/C of the Star contactor first?
  12. M

    How to on & off the dol or star delta motor with timer?

    Hey guys...... I am new to this forum. I looking for a solution since a week but i am not able to get it. I want to switch on & switch off the dol or star delta motor with timer (Please note: here i am not talking about a timer switch which is used to switch the motor from star to delta). I...
  13. Jim90

    Help with 3 phase star delta motor

    Hi, I've been sent on a job to investigate a fan not working correctly. After investigation found that the fan doesn't run in 'Auto' or 'High speed' and just shows 'trip' on the control panel. The fan will run in low speed. I've replaced the belts on the fan as they were frayed. Opened the...
  14. Pete999

    One more Star Delta video for those still learning and for those who have forgoten

  15. Simon-0116

    3ph star delta starter motor drawing high amps

    Star delta starter / motor problem. Starter starts runs as should on bench with no motor connected. Getting 230v to e on all 6 uvw 1s and uvw2. 415 u1 to v2 etc etc. But nothing 1 to 2s. As expected. When motor connected up. (Single speed) it takes 3a in start on all . Drops into run fine but...
  16. K

    Star delta testing help needed

    Hi I need some help I haven't work on star delta motors since my 1st year apprenticeship. How do you test the motor from the panel i.e check that the windings are balanced? Any help much appreciated
  17. T

    Star Delta motor into DOL starter?

    Hello everyone. I have a new star delta pump (7 core flying lead) that has to be made off into a DOL single contactor starter. Is this possible and does anyone know how?
  18. G

    Star delta fan wiring help please

    Hello there have been asked to fault find on a clients 3 phase star delta fain in a grain store. the client purchased the fan second hand and I have power across the contractors but no power on the out going side. no wiring diagrams either. Can anybody give me some in what to check for and...
  19. Tiny Spark

    Star Delta starters and timers....

    Hey all, Been away for a while with the new job thats keeping me busy! But ive had a head banger of a day and could do with a helping hand of someone more in the know that I. So heres the problem, We have a AHU with a large supply motor thats started via a star delta starter, Now last week 2 of...
  20. Simon-0116

    star delta - generator

    Got star delta motor new installation, when goung into run just dies, dosrnt trip over losd, as if contactor not holding in on run. Wrong wiring diagram eith pannel, u1 goes u2, v1 to v2, w1 to w2 on motor windings. Running of a generator, 200kva, 50 kw motor, so man enough. Pannel firm...
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