Southbend SB1053 Correcting Phase Polarity Wiring, To correct wiring that is out of phase

16-Speed Gearhead Lathe E L E C T R I C A L For Machines Mfg. Since 3/11

Correcting Phase Polarity Wiring

This sub-section is only provided for troubleshooting. If you discover during the test run that the lathe will not operate, or that the spindle runs backwards, the lathe may be wired out of phase. Without the proper test equipment to determine the phase of power source legs, wiring machinery to 3-phase power may require trial-and-error. Correcting this is simply a matter of reversing the positions where two of the incoming power source wires are connected.

To correct wiring that is out of phase:

1.Push the STOP button, turn the master power switch to OFF, and disconnect the machine from power.

2.Open the electrical box and swap any two hot wires coming from the plug, as illustrated in Figure 148.

3.Close and latch the electrical box, and reconnect the machine to the power source.

Ground

To Power	Hot	Hot Hot
Supply
Swap any two		MASTER
of these wires		POWER SWITCH

L1 L2 L3

Figure 148. Swapping L1 and L2 power connections

to correct out-of-phase wiring.

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