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August 2003

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Subject:
From:
"Dehoyos, Ramon" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 8 Aug 2003 12:03:10 -0700
Content-Type:
text/plain
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        Perhaps the last mail did not go out.
        Regards,
        Ramon

> -----Original Message-----
> From: Dehoyos, Ramon
> Sent: Wednesday, August 06, 2003 1:49 PM
> To:   [log in to unmask]
> Subject:      RE: [TN] Temp stability in Zone 3
>
>       Ed:
>       Change the Zone 4 and 5 temp to 140 and see if the problem still
> persists. That would eliminate the exhaust situation.
>       Regards,
>       Ramon
>
> -----Original Message-----
> From: Hal Winslow [SMTP:[log in to unmask]]
> Sent: Wednesday, August 06, 2003 10:42 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] Temp stability in Zone 3
>
> Ed,
> As you allude to, the exhaust may play a factor here.  I would spend some
> time making sure that all the "higher temp" zones are clean.  If, for the
> sake of argument, the exhaust flow was reduced on either Zone 4 or 5, you
> might see some of the air, and thus the "energy" flow from zone 4 out
> through the zone 3 exhaust, thus raising the temperature.
>
> Good luck,
> Hal
>
>       -----Original Message-----
>       From: TechNet [mailto:[log in to unmask]]On Behalf Of Ed
> Popielarski
>       Sent: Wednesday, August 06, 2003 10:28 AM
>       To: [log in to unmask]
>       Subject: [TN] Temp stability in Zone 3
>
>
>       Hi everyone,
>
>       I ran into an issue that has me scratching my head (no, it's not
> fleas!) My customer is having temp stability problems in Zone 3 of a BTU
> VIP70 reflow oven no gas. Below are the setpoints of each zone in deg C:
>
>       Z1T: 140
>       Z1B: 140
>       Z2T: 140
>       Z2B: 140
>       Z3T: 140
>       Z3B: 140
>       Z4T: 180
>       Z4B: 180
>       Z5T: 230
>       Z5B: 230
>
>       All zones are holding +/- 1 deg C EXCEPT Z3T which after setpoint is
> reached, climbs very slowly (about 5 deg C/hour) and Z3B at half that
> rate. Once this 5 deg deviation is reached, the system alarms (as it
> should).  I have confirmed the solid state relays are not "leaking"
> (swapped them with good zone), the computer is setting the duty cycle of
> these at 0% (once setpoint has been reached) , this has been confirmed
> electrically, and there are no ground faults in the heaters, convection
> fans are running. BTU has offered the customer little, if any advice.
>
>       My theory is that "stray energy" from Z4 and possibly Z5 are heating
> Z3 which, possibly due to inadequate ventilation, cannot cool. I was
> hoping someone in the forum might have experienced a similar issue and
> would share that experience. I haven't measured the exhaust flow rate yet,
> as I didn't want to chase a "ghost", but it IS running.
>
>       It's not often I get stumped (Steve G. can attest to that!) but this
> one really has me baffled.
>
>       Regards,
>
>       Ed Popielarski
>       QTA Machine
>       27291 Jardines
>       Mission Viejo, Ca. 92692
>
>       Phone:949-581-6601
>       Fax: 949-581-2448
>       Cel: 949-337-2578
>
>       WWW.QTA.NET <http://www.QTA.NET>
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