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Most Online117 Jan 16th, 2020
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#20073 - 04/01/17 03:13 PM
Motor Wiring with Softstart
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Joined: Dec 2015
Posts: 1,537
Indirtwetrust
ElevatorPractitioner
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ElevatorPractitioner
Joined: Dec 2015
Posts: 1,537
Local 18
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I put in 2 softstarts on Dover SS Hydros this week. First one was straightforward, across the line, 6 lead, 30hp motor. When I got to the next one, there were only 3 leads in the controller. First I was thinking if it's a 3-wire Wye 30hp motor, I'm going to need a way bigger starter. But when I opened the motor J-box I found it was a 6 lead motor, just wired Delta in the box with 3 leads brought to the controller. What I did was brought all 6 leads back to the starter and wired it like a typical 6 lead motor. My question is, could I have left the wiring like it was and just ran the 3 leads through the starter and fault contractor in series like an in-Line config? This didn't cross my mind until I left but I don't really doubt the motor would work, either way it's wired in delta with L1 to T1&T6, L2 to T2&T4, L3 to T3&T5. Would the Siemens starter have come up with a motor wiring fault? Anyone ever wired one this way? It would have saved me almost 2 hours and a trip to the electrical supply for my boss.
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#20094 - 04/03/17 11:54 PM
Re: Motor Wiring with Softstart
[Re: Indirtwetrust]
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Joined: Jan 2014
Posts: 432
Vatorgator
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addict
Joined: Jan 2014
Posts: 432
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have done it quite a few times dirt, as long as you have the space, it is way easier, and saves time. I think I have at least a dozen or so installed this way in the last 5 years, and not one problem. been using s+s for the last five years, One thing i will say about the s+s, is if you get the smaller units that are for your specific horsepower etc, the lugs are quite small, and when you get to the job you will be fighting the wiring, so much easier to buy the biggest one for a couple hundred extra bucks, and save a headache. plus in my opinion it should last longer.
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