Re: [foxboro] FBM224-multiple slaves on one port
- From: "Bob Wingard" <bwingard@xxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Sat, 7 Jul 2007 20:38:55 -0500
Corey,
We have a couple of FBM224s communicating with GE Multilin 469s in a 2300v
MCC. One installation has six starters on one 485 network and the other has
4 with room for 2 more.
I can not tell you exactly how much delay one or more of the slaves being
powered off adds to the network cycle time, but I can say we have not noted
any perceivable increase in the delay to start or stop one of these devices.
We have an outage coming up at the end of the month; maybe I will do some
testing.
Our MCCs are wired with a test switch. The test switch allows for the
control circuits to be powered up with the bucket racked out. The 110v power
comes from a source other that the control power transformer. These lineups
are fairly new and they met code when installed.
Regards,
Bob Wingard
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Corey R Clingo
Sent: Friday, July 06, 2007 6:06 PM
To: foxboro@xxxxxxxxxxxxx
Subject: Re: [foxboro] FBM224-multiple slaves on one port
I haven't looked at the docs yet to see what information is available from
the starters. But regardless, I doubt I'll be able to talk anyone into
reversing the breaker-starter order; the breaker is used to deenergize
the bucket itself (and never mind the possible NEC implications). I'm
probably making more out of this than is there; the bucket will remain
energized if the motor is hooked up in the field regardless, to keep the
dryers/heaters activated. If the motor is disconnected, say for repair,
we would probably just offline (you heard it verbed here first, folks) the
device in system management, which I presume would prevent it from being
polled.
We are hooking up a non-critical daisy-chain setup in my other plant soon,
so I'll probably test some of these theories on that string.
Best Regards,
Corey Clingo
BASF Corporation
"Kevin Fitzgerrell" <fitzgerrell@xxxxxxxxx>
Sent by: foxboro-bounce@xxxxxxxxxxxxx
07/06/2007 05:33 PM
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Re: [foxboro] FBM224-multiple slaves on one port
Corey,
Last time I looked at a similar project I didn't get specs until too
late, but it looked like the best solution would leave the starters
online with the breaker downstream. Ours had several parameters that
would have been convenient to monitor even while racked out.
Regards,
Kevin FitzGerrell
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