American Magnetics 430, Installation, Operation And Maintenance Instructions

Page: 104 / 254

88 R
EV
9
A
MERICAN
M
AGNETICS
, I
NC
. O
PERATION
: S
ETUP
S
UBMENU
D
ESCRIPTIONS
: P
ROTECTION
S
UBMENU
PS
WITCH
C
OOLING
G
AIN
The default cooling gain of 0.0% may be adequate for the
majority of wet persistent switches. However, this setting can
offset magnet field/current drift during persistent switch cooling,
especially with conduction cooled switches which generally
require longer cooling times.
Increasing the cooling gain adds control loop gain during the
switch cooling cycle. Too little cooling gain may result in magnet
drift during a long period of switch cooling. Most systems that
require some cooling gain to control magnet drift will likely work
with value set to about 25%. The value can be set by using either
the numeric keypad as described on page 54 or the fine adjust
knob (on page 55).
P
ROTECTION
S
UBMENU
The Protection submenu configures parameters related to
protective measures that can be applied to magnet operation to
prevent accidental damage and respond during a quench or
other critical events.
C
URRENT
L
IMIT
CAUTION
The Current Limit is normally set to the Magnet Rated
Current specific to the connected superconducting magnet.
The setting should not be changed unless a different
magnet is to be used; always refer to the magnet
specifications (see page 108) before changing the Current
Limit.
A magnet operates within the capabilities of the associated
power supply. The current output limits of the supply, which are
not user-adjustable, should be selected to be equal to or higher
than the Current Limit.
If the power supply is four-quadrant, the Current Limit applies to
both the positive and the negative current direction (current limit
symmetry).
0.00 A
P
PSwitch Cooling Gain (%)
0.00 Vs 0.0
0.00 A
P
Current Limit (A)
0.00 Vm ±100.000