# Motor starter I have wired a star delta starter panel to drive 55kw motor that is driving a pump. The fitter changed an old pump to go repairit and installed a new pump, now the pump is not pumping so the fitter is pointing the starter as a problem. What effect might a starter have on this problem? The starter is pulling 20 Amps on star and 40 Amps on delta

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Verify all three legs of the power are on. You could have a single blown fuse that would cause the motor to single phase and not run.

Posted on Aug 24, 2013

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Posted on Jan 02, 2017

SOURCE: high amp start up draw

I don't care what kind of stories Craftsman tells, their numbers don't add up.
One horsepower is ~ = 740 watts of energy.
2.5 hp equates to a steady-state power consumption of  ~1850W and this could be 50% higher during the first second or two after turn-on.  Your 15 Amp circuit is pushed to the limit by that power level; 15 Amps X 120 VAC = 1800W And, motors aren't a breakeven game; part of the power they draw is wasted in heat.

9 amps steady-state would be a power consumption of over 6kw which cannot be right. Either your measurements or the motor is faulty.

Posted on Dec 15, 2008

check & confirm the following
1. delta connection of the motor is done properly, with the combination of different windings.
2. check the quality of the 3 pole mcb or check with other one.
you can call me in 00971508105450 or mail me a00971508105450@hotmail.com

Posted on Mar 13, 2009

WEll, maybe, but what happens is the connectors loose their spring tension, teh resistance goes up, the heat goes up, looser....and fail. the only solution is to cut out all heat damaged material and install somthing heavier. Not always an easy task, but it will keep happening until you do.

Posted on Oct 01, 2010

Hi Casey, I'm an electrician and can help you with this problem.

First, a disclaimer. Without the catalog number of the motor you have, or a wiring diagram for it, no one can tell you how to wire this motor with any certainty. With that said...

Nearly all single speed 3 phase motors have 9 leads (numbered 1 thru 9) and can be wired for either "high" or "low" voltage. Most of the time, high is 480 volts and low is 208/240 volts. Given that you posted the amperage as "41-38 / 19", I am 99% confident that 41 amps is at 208 volts, 38 amps is at 240 volts and 19 amps is 480 volts. Further below is the way to wire unless the motor manufacturer or name plate indicates differently. You will need to determine the voltage of the appliance this is going to be installed into. You should be able to find this on a name plate of the appliance - but it may provide a dual voltage spec here, too. If this is the case, you will need to *carefully* measure the voltage with a meter, or find out the voltage of the electric panel that feeds the appliance.

Once you have learned the incoming voltage, you will connect the motor as such when L1, L2 and L3 are the line voltage supply wires and wires 1 thru 9 match the numbers on the nine wires from the motor.

208/240 or "Low" volts:
Motor leads 4, 5 & 6 connected together and wirenut.
Motor leads 1 & 7 to L1 and wirenut.;
Motor leads 2 & 8 to L2 and and wirenut and lastly,
Motor leads 3 & 9 to L3 and wirenut.

480 or "High" volts:
Motor lead 1 to L1 and wirenut,
Motor lead 2 to L2 and wirenut,
Motor lead 3 to L3 and wirenut,
Motor leads 4 to 7 and wirenut,
Motor leads 5 to 8 and wirenut and lastly,
Motor leads 6 to 9 and wirenut.

The motor should be operated briefly or "jogged" to determine the direction the motor turns. If the motor rotation needs to be changed, simply swap any two "L" wires (swap L1 and L2, or L1 and L3, or L2 and L3). Test once more to verify rotation and when correct close the wiring compartment and complete the installation. Swapping the L wires will likely be much quicker and easier to do at the magnetic contactor instead of the the motor's wiring compartment. Either location is acceptable.

You should try to obtain the name plate data for this motor - if at all possible to to make sure of the voltage and wiring method. I hope this helps & good luck!

Posted on May 14, 2012

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