Operation – American Magnetics 4Q12125PS-430 High Stability Integrated Power Supply System User Manual

Page 53

Rev. 5

Operation

Shift Key Commands : Ramp Rate

Pressing the right arrow key accesses the next (third) segment

ramp rate display. The segment 3 ramp rate is set to a value of

0.05.

Pressing the right arrow key accesses the segment 3 current range

display.

Note

Note that when there is more than one segment, the upper bound of

the last segment is always the Magnet Current Rating

(or the

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

+50.00 A - Seg.3 Ramp Rate (A/sec)

+0.50 Vs

±0.0500

+50.00 A - Seg.3 Range (A)

+0.50 Vs

±58.0 to ±Limit