Southbend South Bend 16 SPEED GEARHEAD LATHE SB1053 - Manual (Page 92)

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For Machines Mfg. Since 3/11 16-Speed Gearhead Lathe E L E C T R I C A L
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.
Swap any two
of these wires
L3 L2 L1
To Power
Supply
Hot
MASTER
POWER SWITCH
Hot Hot
Ground
Figure 148. Swapping L1 and L2 power connections
to correct out-of-phase wiring.