American Magnetics 430, Installation, Operation And Maintenance Instructions

Page: 83 / 254

R
EV
9 67
A
MERICAN
M
AGNETICS
, I
NC
. O
PERATION
: SHIFT+
KEY
C
OMMANDS
/ M
ENUS
will be limited. As the
i x R
drop of the leads increases with current, the
voltage available to charge the magnet will be reduced.
R
ESET
Q
UENCH
(S
HIFT
+
3)
The RESET QUENCH (SHIFT+3) key is used whenever a quench
detection has occurred and is being indicated on the display (example
shown below).
When a quench detection has occurred, the Model 430 Programmer will
respond to no further input until the
RESET QUENCH
key is pressed, or
until the quench condition is cleared by a remote command. For more
discussion of quench detection see page 123.
I
NCREMENT
F
IELD
(S
HIFT
+
4)
The
INCR. FIELD
(SHIFT+4) key is used to manually increase the field.
This is done at the defined ramp rate(s).
When the
INCR. FIELD
key is pressed, the current/field begins ramping
up. If the
INCR. FIELD
key is pressed again (while the current/field is
manually ramping up), the ramping will be paused. Alternately, the
RAMP / PAUSE
key may be pressed to pause manual ramping. Manual
ramping will continue until paused or the Current Limit
22
is achieved.
NOTE
If the current/field is negative, using the
INCR. FIELD
key to
increase (make more positive) the current/field, the magnitude of
the current/field decreases.
F
IELD
<> C
URRENT
(S
HIFT
+
5)
The FIELD <> CURRENT ( SHIFT+5) key is used to toggle between the
use of field units, either kG (kilogauss) or T (tesla), and the use of current
units (A)
23
. If the Model 430 Programmer is using field units (either kG or
T) and the
FIELD <> CURRENT
SHIFT-key is pressed, the Model 430
Programmer will begin using current units (A). Conversely, if the Model
430 is using current units (A) and the
FIELD <> CURRENT
SHIFT-key
is pressed, the Model 430 will begin using field units (either kG or T).
0.00 A - Quench Detect @ +45.81 A
0.00 Vs
PSwitch Heater: ON
22. See page 88.
23. The value is always displayed in current (A) when an installed persistent switch is in the
cooled state since the value represents power supply current only, independent of the stored
(i.e. persistent) magnet current/field.