3 phase y connections
3 phase y connections
(OP)
I own a machine shop, and a machine that I recently purchased has a motor that has a y connection and I cannot find any info as to how to wire it for low and high voltage. Could someone give me a little wiring diagram. Thanks I am desperate
HDbiker
HDbiker





RE: 3 phase y connections
Alternately and less safely, visit
http://www.mmsonline.com/articles/019904.html
http://www.reliance.com/prodserv/motgen/b7099.htm
http://www.usmotors.com/products/ProFacts/1-120-7.htm
etc. for more info
RE: 3 phase y connections
If the machine is belt/chain driven, remove the belt to test - if it runs backwards, it might damage the machine.
There could be 3 or 6 (two sets of 3) terminals.
If 6, one set of three will be connected by metal links.
Connect your cable to the other/free terminals, probably marked L1, L2 and L3.
Your cable is color coded - may be red, yellow, blue
Normally red (or first colour) is connected to terminal L1; yellow (or second colour) is connected to terminal L2; blue (or third colour) is connected to terminal L3.
This sequence is traditional - not absolutely neccessary. Any sequence will work - the worst that will happen is that the motor will run backwards. If it runs backwards, swap any two wires - usually second/L2 and third/L3 (only a convention)
Do a RAPID switch on and off - just to see which way the motor turns.
Replace the belt/chain.
Hope that helps.
RE: 3 phase y connections
RE: 3 phase y connections
Higher Voltage connection:
Line 1 to Terminal 1, line 2 to terminal 2, line 3 to terminal 3
Connect and insulate T4 with T7
T5 with T8
T6 with T9
Lower Voltage connection:
Line 1 to T1 and T7
Line 2 to T2 and T8
Line 3 to T3 and T9
Connect together and insulate T4, T5and T6
The identification of the motor terminal leads could change for motors manufactured out of USA.
RE: 3 phase y connections