Walker Magnetics IMI Smart-D Series, Operation Manual

800-WMAGNET

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2.3 Additional Warnings

• 

Disassembly or repair of this chuck control can result in reduced holding power and/or cause 

an unsafe condition. Therefore, any time the control is disassembled or repaired it should be 

thoroughly inspected and re-tested for proper electrical grounding and power output.

• 

Modification of any operating circuits and electrical safety grounding can reduce the chuck 

control’s effectiveness and/or cause an unsafe condition.

• 

Repair of this chuck control should only be done by the O. S. Walker Co.*

2.4 Designated Person

* Walker replacement parts may be installed by a **

Designated Person

.

** Designated Person -

 A person selected or assigned by the employer as being competent to replace specific parts listed 

in this manual and is able to verify the proper functioning of the specific replacement parts and the entire product after the 

completion of the installation.

ELECTRICAL GROUNDING

Because the O. S. Walker Co. does not know the specifics of each application and installation of these 

products and the electromagnetic device to which they are attached, it can only warn the installer and 

user that the electrically conductive body of the electromagnetic device MUST be connected to a proper 

electrical ground.

According to ANSI/NFPA 79 1997(an American National Standard) “Electrical Standard for Industrial 

Machinery”:

• 

Section 19.3 Equipment Grounding:  The machine and all exposed noncurrent-carrying conductive 

parts, material, and equipment, including metal mounting panels that are likely to become energized 

and are mounted in nonmetallic enclosures, shall be effectively grounded.

• 

Section 19.2.4 Grounding Conductors:  It shall be permissible to use machine members or structural 

parts of the electrical equipment in the grounding circuit provided that the cross-sectional area of 

these parts is at least electrically equivalent to the minimum cross-sectional area of the copper 

conductor required.

• 

Section 19.6.1 Continuity of the Grounding Circuit:  The continuity of the grounding circuit shall be 

ensured by effective connections through conductors or structural members.

• 

Section 19.6.3 Continuity of the Grounding Circuit:  Moving machine parts, other than accessories or 

attachments, having metal-to-metal bearing surfaces shall be considered as bonded. Sliding parts 

separated by a non-conductive fluid under pressure shall not be considered as bonded.

PRIOR TO ENERGIZING THE ELECTROMAGNETIC DEVICE, CHECK ALL THE ELECTRICAL CONNECTIONS 

AND CONFIRM THAT THE METAL BODY OF THE ELECTROMAGNETIC DEVICE IS ELECTRICALLY 

GROUNDED.