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October 2004

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Subject:
From:
"Crepeau, Phil" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 15 Oct 2004 10:32:11 -0700
Content-Type:
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text/plain (187 lines)
hi,

sorry to be so late responding to you.

the pin router is a sony 'compact assembly tool cast-pro', model cast-cr1.  i scanned the area being routed (while it was routing) using an acl staticide electrostatic locator model 300b.  so, no it probably wasnt the correct way of measuring the charge, and i'd apprciate a recommendation in that regard.

in addition, if anyone using a sony pin router can tell me if any extra esd precautions should be taken, let me know.

thanks,

phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Leo Higgins
Sent: Wednesday, October 13, 2004 1:14 PM
To: [log in to unmask]
Subject: Re: [TN] pin router and esd


Are you using a proper electrostatic voltmeter?

Regards,
Leo

-----Original Message-----
From: Crepeau, Phil [mailto:[log in to unmask]]
Sent: Wednesday, October 13, 2004 1:38 PM
To: [log in to unmask]
Subject: [TN] pin router and esd


hi,

i'd like a sanity check if you don't mind.  we are separating panels
populated panels using a turbine driven pin router.  i just knew that this
equipment was generating excessive esd voltages.  i used a hand held meter
and measured the field while it was routing a panel.  i didn't detect any
significant voltage.  does this seem reasonable?

phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Gene Felder
Sent: Wednesday, October 13, 2004 10:37 AM
To: [log in to unmask]
Subject: Re: [TN] ESD Question


When working with voltages over 250 VAC, ESD personnel grounding should not
be used, rather ionization may be required to neutralize electrostatic
charges.

Per ESD Handbook TR 20.20 paragraph 5.3.6.1 Introduction and Purpose /
General Information "The primary method of static charge control is direct
connection to ground for conductors, static dissipative materials, and
personnel. A complete static control program must also deal with isolated
conductors that cannot be grounded, insulating materials (e.g., most common
plastics), and moving personnel who cannot use wrist or heel straps or ESD
control flooring and footwear.
Air ionization can neutralize the static charge on insulated and isolated
objects by charging the molecules of the gases of the surrounding air."

As important as ESD control is, it is of secondary importance compared to
employee safety.  Questions regarding safety should be answered by the
facility's safety officer.  The safety officer and ESD Coordinator should
be aware of this information

ANSI/ESD S20.20 states:
"Paragraph 5. PERSONNEL SAFETY
The Procedures and equipment described in this document may expose
personnel to hazardous electrical conditions. Users of this document are
responsible for selecting equipment that complies with applicable laws,
regulatory codes and both external and internal policy. Users are cautioned
that this document cannot replace or supersede any requirements for
personnel safety.  Ground fault circuit interrupters (GFCI) and other
safety protection should be considered wherever personnel might come into
contact with electrical sources.  Electrical hazard reduction practices
should be exercised and proper grounding instructions for equipment must be
followed."

Many Wrist Straps and Foot Grounders are Underwriter Laboratories listed.
 UL cautions:
A one megohm resistor is molded into Wrist Strap Coil Cords. DO NOT REMOVE.
If it becomes damaged, replace Coil Cord immediately. These products are
not to be used in areas where the individual may come in contact with
exposed electrical circuitry exceeding 250 volts.

These products are for ElectroStatic control. They will not reduce or
increase your risk of receiving electrical shock when using or working on
electrical equipment. Follow the same precautions you would use without
wrist straps, including:
. Make certain that equipment having a grounding type plug is properly
grounded.
. Make certain that you are not in contact with grounded objects other than
through the Wrist Strap.

In addition, per ESD Handbook TR 20.20 section 5.3.13.6 Other
Considerations "For personnel safety, static control garments should not be
worn in situations where there is exposure to high voltage."

Gene Felder
[log in to unmask]

-----Original Message-----
From:   Gregg A. Owens [SMTP:[log in to unmask]]
Sent:   Wednesday, October 13, 2004 10:01 AM
To:     [log in to unmask]
Subject:        [TN] ESD Question

Dear TechNetters:

In one of my customers test departments they test ESDS assemblies with
voltages from 50 to 1400 volts. I have read that personal grounding
should not be used when exposed to voltages over 250 volts. So how does
a test technician protect the ESDS items while maintaining their
personal safety from potential electrical shock? I realize that wrist
straps have a one meg ohm resistor inside, but is that trustworthy for
personnel safety?

Any thoughts?

Gregg A. Owens, CIT
Manufacturing Technology Training Center, Inc.


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