Lincoln Electric IM986 manual A-14, Installation, sources, and result in arc interference

A-14 INSTALLATION A-14

Work Voltage Sensing

The POWER WAVE® i400 is configured at the factory to sense work voltage at the negative output stud (positive output polarity with remote Work Voltage Sensing disabled).

CAUTION

Negative electrode polarity operation WITHOUT use of a remote work sense lead (21) requires the Negative Electrode Polarity attribute to be set via the Fanuc Teach Pendant or with the Weld Manager Utility (included on the Power Wave Utilities and Service Navigator CDʼs or available at www.powerwavesoftware.com).

------------------------------------------------------------------------

While most applications perform adequately by sens- ing the work voltage directly at the output stud, the use of a remote work voltage sense lead is recom- mended for optimal performance. The remote WORK sense lead (21) can be accessed through the four-pin voltage sense connector located on the control panel by using the K940 Sense Lead Kit. It must be attached to the work as close to the weld as practical, but out of the weld current path. For more information regarding the placement of remote work voltage sense leads, see the section entitled "Voltage Sensing Considerations for Multiple Arc Systems."

FIGURE A.3

DIRECTION

OF TRAVEL

WARNING

If a remote work voltage sense lead is used, it must be enabled through the Fanuc Teach Pendant or with the Weld Manager Utility (includ- ed on the Power Wave Utilities and Service Navigator CDʼs or available at www.powerwavesoftware.com).

------------------------------------------------------------------------

Voltage Sensing Considerations for Multiple Arc Systems

Special care must be taken when more than one arc is welding simultaneously on a single part. Multiple arc applications do not necessarily dictate the use of remote work voltage sense leads, but they are strong- ly recommended.

If Sense Leads ARE NOT Used:

•Avoid common current paths. Current from adja- cent arcs can induce voltage into each others cur- rent paths that can be misinterpreted by the power

sources, and result in arc interference.

If Sense Leads ARE Used:

•Position the sense leads out of the path of the weld current. Especially any current paths com- mon to adjacent arcs. Current from adjacent arcs can induce voltage into each others current paths that can be misinterpreted by the power sources, and result in arc interference.

•For longitudinal applications, connect all work leads at one end of the weldment, and all of the

work voltage sense leads at the opposite end of the weldment. Perform welding in the direction away from the work leads and toward the sense leads.

(See Figure A.3)

CONNECT ALL SENSE

LEADS AT THE END

OF THE WELD.

CONNECT ALL WORK LEADS AT THE BEGINNING OF THE WELD.

POWER WAVE® i400