delta

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  1. X

    UK 3 Phase Motor Star/ Delta phase conversion

    Hi Guys, We have a CNC router which uses single phase for the spindle, stepper motors and control box. This is all wired in and working correctly. However, the CNC also features a vacuum bed, powered by a seperate 3 phase motor. We have no 3 phase in our shop, the motor is labeled as 4kW...
  2. 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...
  3. R

    Star to Delta conversion

    Hi. I need to alter the configuration of this motor wiring from star to delta so that I can use a VFD to control it (hopefully). If I remove the star connection from the N terminal am I safe to assume that these 3 wires will be in the correct orientation/ polarity to make the delta connection...
  4. A

    Delta HMI write error in Biscuit Dropping Machine : showing com 3 station 3

    Delta HMI write error in Biscuit Dropping Machine : showing com 3 station 3
    • anujbhargav
    • Thread
    • delta error machine showing station write
    • Replies: 3
    • Forum: UK Electrical Forum
  5. 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...
  6. 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)...
    • u913206
    • Thread
    • delta doesn't motor pump star delta work works
    • Replies: 8
    • Forum: UK Electrical Forum
  7. S

    Problems with starting a 415v saw. Fires up in star, cuts out in delta

    Bottom switch on off, top star delta. The motor spins freely when not connected via the drive belts, so too does the blade
    • speedscreed
    • Thread
    • delta fires out problems starting
    • Replies: 7
    • Forum: UK Electrical Forum
  8. 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...
  9. 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...
  10. 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...
  11. S

    Unbalanced Delta load

    Hi guys. I have an electric oven with 6 elements.the connection, one thermostat has 4 element and the other termostat has 2 elements. Its ,,delta" connected. If the first thermostat is on then: L1 connected to 4 elements. L2 to 2 elements L3 to 2 elements in delta. If the second thermostat is...
  12. 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...
  13. R

    3 wire Delta calculations

    I have a question on 3 wire Delta connected winding with Phase Supply between X, Y & Z is 370 Volts. What is the voltage between One Phase 'X' and the center tap of the opposite winding? See attached doc.
  14. M

    delta transfomer current

    Hi All, anybody know the formula to find current on delta transformer?
    • Moch Ismed
    • Thread
    • anybody current delta formula transfomer transformer
    • Replies: 3
    • Forum: UK Electrical Forum
  15. 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
  16. Michael J

    The maximum value for Zs on a TT system is 50/I delta. So for a 30mA RCd is 1667 ohms

    why is this not the case if the final circuits on a TN-S or TN-C-S system are protected by a RCD? Funny what you think of when you can’t sleep
  17. A

    Connections of a Three phase Motor STAR and DELTA. 1.0

    Well You all guys know how a Star Delta Motor Works, In Case Some New Sparks in the Electrical Industry wants to know they can download or follow this simple Diagram of a Three Phase Motor. It Tells Both DELTA and STAR Connections of the Motor Windings. I will soon put a wiring diagram of Star...
  18. R

    Lower the voltage of a three phase 220v delta wiring system with auto transformers

    Hi all, I have a three phase 220v delta wiring system but the real voltage is about 240-245V by measuring between the pairs RS, RT, TS. I want to lower it to about 220V so I was thinking to use three auto-transformers 240-220V wired like this: I expect to find 220V between the transformer...
  19. V

    3 phase immersion heaters in star (no N) or delta

    Hi all Been to a micro brewery today . They have 2 water boilers with 3 phase immersion heaters in them (ie 3 x elements) Originally they were wired to run single phase will all the lives and neutrals linked out and a 32A single phase supply connected to them. Now they are wired in a star...
  20. 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...
    • IrishSparks
    • Thread
    • delta motor problem star delta
    • Replies: 18
    • Forum: UK Electrical Forum

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