American Magnetics 430, Installation, Operation And Maintenance Instructions

Page: 87 / 254

R
EV
9 71
A
MERICAN
M
AGNETICS
, I
NC
. O
PERATION
: LED I
NDICATORS
: S
HIFT
I
NDICATOR
CAUTION
If the Model 430 Programmer power supply system is
powered off and moved from one magnet system to
another, the
MAGNET IN PERSISTENT MODE
LED may
not correctly indicate the state of the magnet system until
the first time the persistent switch heater is turned off.
NOTE
Should the magnet quench while the magnet is in persistent
mode and the Model 430 Programmer is off, the persistent mode
indicator LED will be incorrect when the Model 430 Programmer
is turned on again.
The green
MAGNET IN PERSISTENT MODE
LED indicates
that the persistent switch heater is off, and that when it was
turned off, the magnet had greater than 0.1% of the maximum
system current
28
flowing through it. The state of this LED is kept
in nonvolatile memory when the Model 430 is powered off, so
that the LED state is retained even during a power cycle of the
Model 430. Thus, the
MAGNET IN PERSISTENT MODE
LED is
an indicator that the magnet is persistent and has at least
some
persistent field.
C
URRENT
L
EADS
E
NERGIZED
I
NDICATOR
The blue
CURRENT LEADS ENERGIZED
LED indicates that at
least 0.1% of the maximum system current
29
is flowing in the
Model 430 power supply system output current leads.
M
AGNET
Q
UENCH
I
NDICATOR
The red
MAGNET QUENCH
LED indicates that a magnet
quench condition has been detected. See page 123 for details.
S
HIFT
I
NDICATOR
The green
SHIFT
LED indicates that the
SHIFT
key has been pressed,
and the next numeric keypad key pressed will actuate the shifted
function (shown in light blue text on the key label) rather than the
numeric keypad function. See page 62 for details of
SHIFT key use.
28. Example: For a system with an
I
max
value of 125 A, 0.1% of the current would be 0.125 A.
29. Example: For a system with an
I
max
value of 250 A, 0.1% of the current would be 0.250 A.