American Magnetics 03300PS-430-601 High Stability Integrated Power Supply System - Manual (Page 56)

38 Rev. 5
Operation
Shift Key Commands : Ramp Rate
ramp rate in terms of current as specified in the table on page 9. If the
Ramp Segments value 1 is greater than 1, then the menu also allows
setting of the field or current range for which each ramp rate is to be used.
The Model 430 Programmer will ramp at the specified rate if the available
compliance of the power supply is sufficient and the Voltage Limit is not
exceeded. The Model 430 automatically decreases the ramp rate internally
during operation if either the available compliance of the power supply is
insufficient, or the Voltage Limit is active.
3.7.1.1 Ramp Rate SHIFT-key Example
An example (using a magnet with rated current of 60 A
2
) will
illustrate the use of the ramp rate menus. The example assumes
that the field/current units have been set to amperes. and the ramp
segments value has been set to 3. Segmented magnet current
ramping is chosen with rates as follows:
1. ±0.2 A/s from 0 to ±55 A
2. ±0.1 A/s from ±55 to ±58 A
3. ±0.05 A/s above ±58 A.
In the following discussion, the fine adjust knob 3 can optionally be
used for ramp rate adjustment if the persistent switch is heated (or
if no persistent switch is installed). If the user attempts to edit
ramp rate segments using the fine adjust knob while an installed
switch is cooled, the Model 430 Programmer will produce one beep
to indicate an error
4
. Similarly, if the switch is heated (or no switch
is installed), attempting to use the fine adjust knob for PSw P/S
ramp rate will produce one beep 5 .
Pressing SHIFT and then RAMP RATE will access the ramp rate
menu. The numeric and ENTER keys (or the fine adjust knob) are
used to set the segment 1 ramp rate to a value of 0.2.
1. Refer to section 3.10.3.2 on page 63.
2. In this example, both the Current Limit and Magnet Current Rating are set at the
rated magnet current of 60 A.
3. Refer to section 3.4 on page 31.
4. Since the PSw P/S ramp rate is active in that scenario, and not the segmented
ramp rate.
5. Since the standard segmented ramp rate is active in that scenario, and not the PSw
P/S ramp rate.
+50.00 A - Seg.1 Ramp Rate (A/sec)
+0.50 Vs ±0.2000