AMI 420, Installation, Operation And Maintenance Instructions, Page: 62 / 134

44
Rev. 7
Operation
Setup Menu : Load
3.2.2 Load Setup Submenu
If the Load submenu is selected in setup, then several parameters
associated with the superconducting magnet load can be viewed and/or
specified by using the
6(783
key to cycle through the available items.
3.2.2.1 Stability Setting
The stability setting is specified in percent and controls the
transient response and stability of the system. The valid range is
from 0.0 to 100.0%. The default value is 0.0% unless preset by AMI.
The chart below may be used as a guide to set the stability setting
for magnets with a persistent switch installed. Magnets with an
inductance of greater than 3 Henries that have a persistent switch
installed should operate without problems with a stability setting
of 0.0%.
3.2.2.2 Coil Constant
The coil constant is a scaling factor which converts the operating
current to kilogauss (10 kG = 1 Tesla). It is also often referred to as
the field-to-current ratio. The coil constant is specified in kilogauss/
$ × 6WDELOLW\6HWWLQJ
9V
Model 420 Stability Setting vs. Magnet Inductance
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7
Inductance (H)
Sta
b
ility
Se
tting (%
)
$ × &RLO&RQVWDQWN*$
9V