American Magnetics 05500PS-430-601 High Stability Integrated Power Supply System - Manual (Page 60)

42 Rev. 5
Operation
Shift Key Commands : Ramp Rate
Current Limit if set lower than the Magnet Current Rating); it will
be displayed as “±Limit” and cannot be edited.
Now, when current is in the range of 0 to ±55 A, ramping will be
controlled at ±0.2 A/s. When current is in the range of ±55 to ±58 A,
ramping will be controlled at ±0.1 A/s and when current is greater
than ±58 A (up to the limit of 60 A), ramping will be controlled at
±0.05 A/s.
If ramp rate of a ramp segment is being edited while the Model 430
is ramping and the system current/field transitions from the
currently edited segment to the next before the adjustment has
been committed with the ENTER key, the adjusted value will be
discarded. The display will update to show the new segment ramp
rate, and the fine adjust knob will apply to the new segment
(assuming the ENTER key is pressed before the segment has
completed).
If at some later time it is desired to temporarily set the Current
Limit to a new value lower than the Magnet Current Rating, for
example 56 A, this lower value will override the Magnet Current
Rating. Now only the first two ramp segments would be active since
the new “limit” falls within the range of segment 2. The display for
segment 2 range will now appear as follows 1 .
The unused segment(s) will remain in memory (retaining their
original parameters) until one or more become active again as the
Current Limit is raised into or above the respective ranges. When
displayed, the higher-range unused segments will show a range of
“±Limit to ±Limit” until re-activated
2
.
1. If the value were to be set below 55 A, only segment 1 would be active, and would
display the upper bound of “±Limit”.
+50.00 A - Seg.3 Range (A)
+0.50 Vs ±58.0 to ±Limit
+50.00 A - Seg.2 Range (A)
+0.50 Vs ±55.0 to ±Limit
+50.00 A - Seg.3 Range (A)
+0.50 Vs ±Limit to ±Limit