star delta starter wiring differences
star delta starter wiring differences
(OP)
I have a strange problem, where I have 2 wiring methods for star/delta starter for (18Kw)squirrel cage motor.
the first method is working correctly in case of the transformer or the generator is the main supply.
but the second method is working only when the transformer is the main supply.
but in case of the generator is the main supply, the pump made a disturbance in the power system at the transition from star to delta and the pump is fallen down
all methods are shown in the attached
the first method is working correctly in case of the transformer or the generator is the main supply.
but the second method is working only when the transformer is the main supply.
but in case of the generator is the main supply, the pump made a disturbance in the power system at the transition from star to delta and the pump is fallen down
all methods are shown in the attached





RE: star delta starter wiring differences
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: star delta starter wiring differences
A soft starter would be far better for generator starting.
Keith Cress
kcress - http://www.flaminsystems.com
RE: star delta starter wiring differences
Bearing itsmoked's comment in mind, a small change in timing may cause a big change in system upset.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: star delta starter wiring differences
But certainly if there were a difference in the timer settings that could do it too Bill. Good catch.
And Yes, Keith, you are absolutely right about a SS being a better chioce. I am usually one who rails against Star-Delta as a starting choice, I don't think it provides ANY positive benefit, only risk, so there is no "up side" to choosing it. I don't know why I let that opportunity slip by me this time
"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: star delta starter wiring differences
in other words, why it didn't happen with the modified one?
that means there is a small difference between the two methods, what is this?
regarding "KA1 NC interlock circuit on the left side" it is used only in Automatic mode starting and has no function in manual mode.
the problem was done in manual or automatic mode all the same.
RE: star delta starter wiring differences
One question, are these two circuits being used on the same motor and pump assembly, or do you have two motors, one using method 1 and the other using method 2?
From the circuits, I do not see nay reason why one circuit should be any different from the other in a manner that would consistently cause one method to operate and the other trip.
Both methods can cause very high current and torque transients.
Best regards,
Mark Empson
L M Photonics Ltd
RE: star delta starter wiring differences