American Magnetics 05200PS-430-601 High Stability Integrated Power Supply System - Manual (Page 59)

Rev. 5 41
Operation
Shift Key Commands : Voltage Limit
If the Current Limit is raised above the Magnet Current Rating, it
will be ignored and the actual Magnet Current Rating will govern.
3.7.2 Voltage Limit SHIFT-key
Use of the VOLTAGE LIMIT SHIFT-key provides a menu for setting the
limit for output voltage for the power supply the Model 430 Programmer
controls. This value should be set to a high enough value so that under
normal conditions, the Voltage Limit is never reached. The value can be
set by using either the numeric keypad per section 3.3 on page 29 or the
fine adjust knob (section 3.4 on page 31). Note that the voltage drop in the
leads must be accounted for when setting the Voltage Limit, as well as the
voltage drop of an energy absorber if one is used (see section 3.12 on
page 79 for details of how to determine the appropriate Voltage Limit).
The Voltage Limit may be set less than or equal to the maximum output
voltage of the power supply.
1
If Voltage Limit becomes active while ramping, it will be indicated by a
reverse illumination character “V” for the status indicator.
Once the Voltage Limit function becomes active, the current, and therefore
field, will no longer be ramping linearly with time as the voltage available
to charge the magnet will be reduced as the total loop voltage will be
limited. As the IR drop of the leads increased with current, the voltage
available to charge the magnet will be reduced.
3.7.3 Reset Quench SHIFT-key
The RESET QUENCH SHIFT-key is used whenever a quench detection has
occurred and is being indicated on the display (example shown below).
2. Also if the number of segments is increased, the new segments are added to the
upper end of the ramp range, and default to the ramp rate of the previous segment
with the range of +/-Limit to +/-Limit until set up.
1. Refer to Table 3-2 on page 49.
+50.00 A - Voltage Limit (V)
+0.50 Vs ±2.000
+40.92 A Mode: Ramping
+2.50 Vs V PSwitch: ON
+0.00 A - Quench Detect @ +45.81 A
+0.00 Vs
PSwitch Heater: ON