delta

  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. 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...
  3. anujbhargav

    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
  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. 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...
  8. 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...
  9. 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.
  10. M

    delta transfomer current

    Hi All, anybody know the formula to find current on delta transformer?
  11. 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
  12. 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
  13. Amnesh Singh

    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...
  14. 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...
  15. 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...
  16. 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...
  17. T

    Calculation of capacitor value for conversion from star to delta

    Hi does anyone have a notion of how to calculate the capacitance value for the above?
    • The Ghost
    • Thread
    • calculation capacitor conversion delta value
    • Replies: 30
    • Forum: UK Electrical Forum
  18. 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...
  19. 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?
  20. 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...
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