What amperage was drainning your motor at 460 V? The other chance is you received a remanufactured motor and the winding was redesigned for 460 but the shop did not install a new name plate. I only presume that it is 25hp because that is what I was told by the man who sold it to me. Note that this must be the power supply ground conductor, not a wire leading to a ground rod nearby. I don't want anything to blow because of the high voltage. You'll have to assign numbers to the leads. Disconnect all leads and measure continuity through the windings.
So either they mixed the motors up somewhere or there is a way to wire that motor for 480v with the wires I have in the peckerhead. Test the nine leads for continuity with the ohmmeter to determine whether the motor is star wye or delta connected. Will take very little time but needs to be done right. Thanks, I wasn't clear on what you were saying in the earlier post. Connect the 3 live wires the following way.
What I do with the motours I work on I take the stamping punch and punch either D or Y right next to the connection diagram or on pecker head one of the two. Yes, it's possible to really screw 'em up, but hard not to 'see' that you've screwed 'em up. Before you connect any wires, check the drawing carefully. The High Voltage Connection is Star, in this case you will find the Voltage Ratio is 1. The idea is to get all 6 windings pulling and in the same direction. Also, these motors have either six or nine leads.
I think they also may have soldered the other connections as well, that would explain why some of the wire numbers were missing and re-applied with after market tape numbers. Identifying Leads of a Nine Lead Three Phase Motor Question: I have lost track of the leads of a nine lead three phase motor. Use 2 colors to mark each of the 1-2-3 wires to denote different end of the winding. You will need to do a web search for a tech document to re-terminate the motor. The motor manufacturer's website has an online selection tool and it has the motor that was specified should be a 9-lead motor. The leads are marked U1, U2, U5 then V1,2,5 and W1,2,5.
If the coils are rated for 230 volts and you connect them in a wye and provide a 480 volt supply, the coils will see 277 volts, well over the 230 volt design. The six leads are numbered 1,2,3,6,7,8 or it's 1,2,3,7,8,9. One thing is for sure, the motor we have is definitely not the one that we were supposed to have purchased. If your motor was running well before the bearing damage then it was wired proper. That would indicate to me that there are wires inside that were not brought out, as in U,V and W6, which makes sense now. We mentioned a catch, earlier. I can make out on the tag that the motor is dual voltage.
The range between high and low is greater than 1. They are generally held to a standard. I tried to find something that would show how to determine which wires are considered what number off of the stator but could not come up with anything. Repeat this for each group of leads, marking the corner leads 1, 2, and 3. The delta or wye connection is about the desired motor starting arrangement, not how the motor is wound. All calculations or information should be independently verified. We are trying to connect it to 230V Anyone? The motor was specified to be 208-230 or 460 volts.
How can I find out which wires are considered which number off of the windings? Following are specific steps to take when identifying leads of both a star connected and a delta connected motor. Faulty wiring or wrong connection will trigger motor protection to trip. Join your peers on the Internet's largest technical engineering professional community. With a six-lead set-up, you cannot choose whether you get a high-voltage or low-voltage system, but with a nine-lead set-up, you can select either one, using either configuration. The motor is already hooked up just waiting for the 3 480V wires. Please take a look of the address recomended by dbair.
Three phase motor wire connections First read the nameplate for wiring instructions. The company that made this motor is from Canada. Next, use the inductive kick test method to identify the proper markings for the other two leads of each group. Give it your best shot don't shock yourself with the isolation transformer , and if you can't get it, carry the motor to your friendly local electric-motor shop, and ask them to 'ring 'em out for 'ya. In dealing with some other issues, I realized that there were 12 leads going into the motor, and they were all connected. But is necesary investigate in name plate or perform some test prior to starting in order to find the proper conection for the rated voltage. I have one of my technicians in the field working on a motor that has been altered by someone in the past.
You might do a search for this online. How can I re-identify these leads? Look at the pictures and you'll see the difference. You will be able to find the layout one google. I need the 120v hookup diagram. The connection box has 9 leads coming out, not 12 as I would have expected.
I'm suspecting I got the wrong motor, it's been running on 460 and I thought that that had something to do with it's failure. If not, flip one winding's wires. There is a plate for wiring it for Low or High Voltage, For Low Voltage it says to join T1,T7 and T8 together to make Line 1 if I remember correctly, so that would be Delta right? Once you get it going, then it is a matter of adding two of the other pairs, at a time to see if performance improves. The positive voltmeter lead will be found on the 2 lead, and the negative voltmeter lead will be the 5 lead. From outside to in, clockwise, is T1, T2, T3, T7, T8, T9, T4, T5, T6. The 6 leads are what's throwing me.