Marc: Do you have the 11/40-specific wiring harness? Assuming that you do it's a bit
tricky -- not so much mounting a given supply (aside from the fact that they are heavy and
awkward to work with even when minimally populated), but because there is a very tight
tolerance between them to thread the wiring harness. I've determined the hard way
that you really need to install the lower one first, then the harness, then the upper one.
At least for me it wasn't practical/possible to install the harness after-the-fact.
There's also a bit of work involved in threading both of the AC power cables plus the
pair of power-control cables (assuming that you're using a DEC power controller) via
the right-side vertical rack channel -- which also interact with the power harness
placement. Once everything is cabled-in-place the result is maximally compact, but
getting there is not simple. Yes, the power cable wiring isn't well-described
anywhere IMO. You have to stare at the puzzle-pieces for a while and "dry fit".
Harness shape/stiffness helps eyeball how to fit the pieces together, but the importance
of the rack vertical side-channel in making everything fit is not, IMO, made at all clear
anywhere in the various documentation -- although it can be inferred from careful
examination of a few graphics in various documents. The 11/40, the 11/45-50-55, and the
11/70 share the same design in this respect so documentation for one will serve you well
in any of these cases.
If you can tackle the task *before* installing the BA11 chassis you'll find it
easier.
If you're not using a standard DEC rack or don't have an equivalent vertical
side-channel to work with then IMO you'll need to get very creative ... and the
11/40-specifics wiring harness may not work at all and you'll need to build your own.
Fortunately I didn't need to explore that path ...
Good luck!
-----Original Message-----
From: cctech <cctech-bounces at classiccmp.org> On Behalf Of Marc Howard via cctech
Sent: Saturday, December 4, 2021 10:28 PM
To: General Discussion: On-Topic Posts Only <cctech at classiccmp.org>
Subject: Need picture of power supply mounted in 11/40 cabinet
Hi,
I've got an 11/40 I'm going to start working on. Problem is that there are two
power supplies (H742 and H7420) that came with it but neither was mounted in the rack.
Could someone post/send/etc. photos of how the power supply mounts in the rack? Also how
is the power cabling routed (I think I'm missing this part)?
Thanks,
Marc Howard
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