- Original Message -
From: Ted MacNEIL [EMAIL PROTECTED]
Newsgroups: bit.listserv.ibm-main
To: IBM-MAIN@BAMA.UA.EDU
Sent: Friday, January 11, 2008 12:26 AM
Subject: Re: SRM constant
If the LP's are varied on manually, the SRM constant is recalculated to
reflect the new configuration. This does not take place if IRD does the
change.
No. It's not!
The SRM constant is constant.
It does not change during the life of the IPL.
No. It's not! The SRM constant is constant.
It does not change during the life of the IPL.
It DOES change during the life of the IPL:
The Z9 EC has a hybrid cooling system that is designed to
lower power consumption. Normal cooling is provided by one
or two modular refrigeration unit (MRU) connected to the heat
sinks of all multi chip module (MCM) in all books. If one of the
MRUs fails, backup motor scroll assembly (MSA) are switched
in to compensate for the lost refrigeration capability with
additional air cooling. At the same time, the oscillator card
is set to a slower cycle time, slowing the system down by
up to 10 percent of its maximum capacity, to allow the degraded
cooling capacity to maintain the proper temperature range. Running
at a slower cycle time, the MCMs produce less heat. The slowdown
process is done in steps, based on the temperature in the books.
That may be true in theory, but actually we have lost more than
27 percent of the CPC capacity. As soon as the spare MRU was installed
I stopped to get alerted by soft-capping messages.
Mile Pekic, Belgrade
--
For IBM-MAIN subscribe / signoff / archive access instructions,
send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO
Search the archives at http://bama.ua.edu/archives/ibm-main.html
