Work Voltage Sensing

A-7		INSTALLATION		A-7

5.Replace the cover and screws. The PC board will “read” the switch at power up, and configure the work voltage sense lead appropriately.

VOLTAGE SENSING

The best arc performance occurs when the Power Waves have accurate data about the arc conditions. Depending upon the process, inductance within the electrode and work lead cables can influence the volt- age apparent at the studs of the welder. Voltage sense leads improve the accuracy of the arc condi- tions and can have a dramatic effect on performance.

CAUTION

If the voltage sensing is enabled but the sense leads are missing or improperly connected, extremely high welding outputs may occur.

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Do not tightly bundle the work sense lead to the work lead.

The ELECTRODE sense lead (67) is built into the K1795 control cable. The WORK sense lead (21) con- nects to the Power Wave at the four-pin connector located underneath the output stud cover. Enable the voltage sense leads as follows:

TABLE 2

Process	Electrode Voltage	Work Voltage
	Sensing 67 lead *	Sensing 21 lead
GMAW	67 lead required	21 lead optional**
GMAW-P	67 lead required	21 lead optional**
FCAW	67 lead required	21 lead optional**
STT	67 lead required	21 lead required**
GTAW	Voltage sense at studs	Voltage sense at studs
SAW	67 lead required	21 lead optional**

*The electrode voltage 67 sense lead is part of to the control cable to the wire feeder.

**For consitent weld quality work voltage sensing is recommended.

The Power Waves are shipped from the factory with the work sense lead enabled.

For processes requiring work voltage sensing, con- nect the (21) work voltage sense lead from the Power Wave to the work. Attach the sense lead to the work as close to the weld as practical. Enable the work volt- age sensing in the Power Wave as follows:

WARNING

ELECTRIC SHOCK can kill.

•Do not touch electrically live parts or electrodes with your skin or wet clothing.

•Insulate yourself from the work and

ground.

•Always wear dry insulating gloves.

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1.Turn off power to the power source at the discon- nect switch.

2.Remove the front cover from the power source.

3.The control board is on the left side of the power source. Locate the 8-position

DIP switch and look for switch 8 of the
DIP switch and look for switch 8 of the		8
DIP switch.		7
DIP switch.		6
		6
4. Using a pencil or other small object,		4 5
slide the switch right to the OFF position		3
if the work sense lead is NOT connect-		2
ed. Conversely, slide the switch left to		1
ed. Conversely, slide the switch left to
the ON position if the work sense lead is	O N
	O N

present.

5.Replace the cover and screws. The PC board will “read” the switch at power up, and configure the work voltage sense lead appropriately.

Electrode Voltage Sensing

Enabling or disabling electrode voltage sensing is automatically configured through software. The 67 electrode sense lead must be connected at the wire feeder.

POWER WAVE 455/R

IM690-A specifications

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INSTALLATION

VOLTAGE SENSING

SAW