Grizzly G0740 Correcting Phase Polarity Wiring, To correct wiring that is out of phase

Correcting Phase

Polarity Wiring

This sub-section is only provided for troubleshoot- ing. If you discover during the Test Run (Page 26), 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 the phase polarity requires reversing the positions where two of the incoming power source wires are connected. Due to the high voltage and risk of serious shock involved, we strongly recommend this procedure only be done by an electrician or qualified service personnel.

To correct wiring that is out of phase:

1.push the STOP button, turn the two-speed motor switch to OFF, and DISCONNECT THE MACHINE FROM POWER!

2.Open the electrical box and swap any two hot wires R, S, T, as illustrated in Figure 10.

Note: If using a phase converter for 220V 3-phase operation, ONLY swap the R and T wires to correct out of phase wiring. The "wild wire" is connected to the S terminal.

	R	S	T E E R1			S1	T1	U1
Ground
E	R	S	T	E	R1 S1		T1	U1
	R	S	T	E	R1 S1 T1			U1

R1
E S1 T1	U1	S1	E
		W1		0
					A1

	Swap Any Two of
To Plug
	These Wires

Figure 10. Swapping power connections to

correct out-of-phase wiring.

3.Close and latch the electrical box, and recon- nect the machine to the power source.

Model G0740 (Mfg. Since 11/12) -17-