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March 2012

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Subject:
From:
Roger Mack <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 27 Mar 2012 12:06:17 -0500
Content-Type:
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The leading profile datalogger  companies sell pallets to run through the 
oven. They have built in thermocouples and magnets used to sense conveyor 
speed. Their software has basic SPC software included that collects data 
for you,  and an easy  go/no-go display for the machine operator. 
Run the pallet once a week, day or shift on the same program and you will 
get measurements to confirm the oven remains stable. 
This is a very capable method to catch bad heaters, fans, changes in 
exhaust,,,



Roger Mack  P.Eng. 
Manufacturing Specialist
Parker Hannifin Canada
Electronic Controls Division
1305 Clarence Avenue
Winnipeg, MB  R3T 1T4 Canada 
direct 204 453 3339 x373
[log in to unmask]
www.parker.com/ecd







From:
Fabien Guizelin <[log in to unmask]>
To:
<[log in to unmask]>
Date:
03-27-2012 03:28 AM
Subject:
[TN] PWI for reflow
Sent by:
TechNet <[log in to unmask]>



Hello,

Could you give me guideline on how to set-up PWI limits for SMT ?

I experienced a +10oC drift in max-temperature on a transformer between a 
profile taken a year ago and recently.   I am concerned about the 
potential impact it has on the component (over-temperature).
My CM currently operates at 230-260C peak-temp range  which seems broad; 
how does this compares to industry best-practices ?

Thanks for the help.

Fabien


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