American Magnetics 03300PS-430-601 High Stability Integrated Power Supply System - Manual (Page 54)

36 Rev. 5
Operation
Single-key Commands : Ramp / Pause
three seconds before reverting to the default display. The value displayed
is as follows:
•When in driven mode, the present current/field will be displayed.
•When in persistent mode, the current/field will be displayed that
was flowing in the magnet at the time persistent switch was
cooled.
3.6.3 Ramp / Pause Key
Pressing the RAMP / PAUSE key toggles the Model 430 Programmer
between the ramping mode and the paused mode. If the RAMP / PAUSE
key is pressed while the Model 430 is ramping, the ramping is paused. If
the RAMP / PAUSE key is pressed while the Model 430 is paused, the
Model 430 continues ramping.
3.6.4 Ramp To Zero Key
Pressing the RAMP TO ZERO key causes the Model 430 Programmer to
immediately begin ramping field/current up or down to zero field/current
at the defined ramp rate(s). Ramping to zero may be interrupted at any
time by pressing the RAMP / PAUSE key, which causes the Model 430
Programmer to enter the PAUSED mode and maintain the field/current
present at the point it was paused.
Note
If the RAMP TO ZERO function is PAUSED and then the RAMP /
PAUSE button is pressed a second time, the Model 430 Programmer
will begin ramping to the target field, not to zero. If it is desired to
ramp to zero after the RAMP / PAUSE button is pressed, press the
RAMP TO ZERO button again to continue ramping to zero from the
paused state.
Note
If the magnet is persistent (persistent switch heater is not energized)
when the RAMP TO ZERO key is pressed, the Model 430
Programmer ramps the power supply current to zero; the magnet
current will remain constant since the magnet is in persistent mode.
+0.25 A
P Magnet Current (A)
+0.00 Vs +10.00 A