American Magnetics 430, Инструкции по установке, эксплуатации и обслуживанию

Страница: 19 / 254

R
EV
9 3
A
MERICAN
M
AGNETICS
, I
NC
. I
NTRODUCTION
: M
ODEL
430 P
ROGRAMMER
F
EATURES
parameter and will alert the operator that a value was rejected because it
was outside the user-defined limits.
In addition, each setup parameter can be individually selected for
locking. A user-defined password is required to lock or unlock settings.
This allows an administrator to set and password protect any critical
parameters that should not be changed by the operator. Then the
administrator can be confident that an operator will not subsequently
change any of these critical parameters, and yet will be free to change
any non-critical (unlocked) parameters.
C
ONDITION
-B
ASED
M
AGNET
A
UTO
-
R
AMPDOWN
The Model 430 Programmer can be connected to an AMI Model 1700
Liquid Level Instrument, with the LHe measurement option, to allow
automatic rampdown of the magnet (even in persistent mode) should the
liquid helium (LHe) level drop to a preset level. This feature ensures the
magnet will be protected and not experience a quench should the LHe
level reach an unsafe level for magnet operation. A single cable is
required to use this feature and is covered in more detail on page 200 of
the
Appendix
. Contact AMI for more information.
In addition to low LHe level, inputs to the Model 430 Programmer can be
used with other instrumentation as well. Other uses include faults from a
cryocooler, temperature measurement limit, etc.