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RE: [Ausloco] Re: [NSW/ASR] 422 Class Locos
Hi Wayne: The booster principle is promulgated on there always being sufficient excess capacity available from the generator that the ALF traction motors cannot convert to useable tractive effort - ie: the generator can safely produce more current than can be used by the ALF's six traction motors. Thus traction motor capacity/sizing (rather than the generator) is the limiting factor for ALF-only performance. Hope this explains all. Regards:
Melanie Dennis
Australian Steam Group
-----Original Message-----
From: Coleman, Wayne [SMTP:COLEMANW@phibred.com]
Sent: Friday, 12 May, 2000 11:42 AM
To: 'Ausloco@egroups.com'
Subject: RE: [Ausloco] Re: [NSW/ASR] 422 Class Locos
What happens if all the power is being taken by the ALF, does the BU just
hang around for the ride or is there always excess power to demand?
Wayne Coleman
Lucerne/Canola Seed Production Agronomist
colemanw@phibred.com <mailto:colemanw@phibred.com>
-----Original Message-----
From: Melanie J. Dennis [mailto:meld.asg@netspeed.com.au]
Sent: Friday, 12 May 2000 11:13
To: 'Ausloco@egroups.com'
Subject: RE: [Ausloco] Re: [NSW/ASR] 422 Class Locos
Maybe I'm just picking up on a 'typo' but the 'AL' class were Built as
double enders and Rebuilt as single enders when converted to ALF. AFAIK,
the ALF conversion was specifically targetted at using the 'BU' boosters, as
part of the AL > ALF conversion entailed using the excess output of the
generator (AR10-D14) to supply the BU traction motors.
To simplify cabling between ALF and BU, all traction motor power cabling is
routed out the back of the ALF, so single-ended operation of the ALF is
mandatory. Hence, the second cab became superfluorous - perhaps Justin can
tell us what is now installed in the space that used to be the second cab.
And to pick up on an earlier message: the booster unit takes whatever extra
power (amperage) from the generator that the ALF traction motors cannot make
use of, and converts this to extra tractive effort. In an ALF / BU / ALF
lash-up, each ALF is supplying its relative half of the BU. If one ALF
fails, this doesn't cripple the whole consist, it simply means that the
remaining ALF + 1/2BU has an additional ALF + 1/2BU dead weight to drag
around.
Melanie Dennis
Australian Steam Group
-----Original Message-----
From: Patrick J Buchanan [SMTP:mainline@cyber.net.au]
Sent: Thursday, 11 May, 2000 10:35 PM
To: Ausloco
Subject: Re: [Ausloco] Re: [NSW/ASR] 422 Class Locos
Dave,
Your comment that the AL's were built as 'single enders' for 'aesthetic'
reasons !!
God forbid, I hope this is not a personal view !!
>From an aesthetic's point of view the AL's were not exactly pretty engines,
in the first place.
Rebuilding to ALF's wasn't exactly a design coup !!
I'd suspect that the rebuild was more in keeping with AN's policy, in regard
to Motive Power, at the time.
It may have, also been associated with the ill-fated ALF+BU+ALF Combo's !!
But for 'aeshetics' ??
I don't think so !!
Regards
Patrick J Buchanan
[Non-text portions of this message have been removed]
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