American Magnetics 4Q1010PS-430 Integrated Power Supply System - Manual (Page 98)

80 Rev. 5
Operation
Persistent Switch Control : Entering Persistent Mode
Note
The magnet voltage (Vm) is monitored during the power supply
ramp to zero. If the magnet voltage exceeds 0.5 V during this ramp,
the ramp is paused and the Model 430 Programmer beeps to
indicate the persistent switch did not transition to the
superconducting state properly. If this error occurs, the Model 430
will ramp the current back to the value when the persistent switch
was cooled,
and then heat the switch:
After the persistent switch heated time has elapsed, the display
will indicate the persistent mode transition malfunction:
After pressing ENTER, the Model 430 Programmer will revert to
the default field/current display.
5. After the power supply is finished ramping to zero, the following
screen will be displayed:
+45.39 A Mode: Power Supply Ramping
+3.44 Vs to match magnet field
+50.00 A Mode: Heating Switch
+3.50 Vs ***** PSW Lock Error *****
+50.00 A - Mode: Paused w/PSW error
+3.50 Vs Press ENTER to continue
+50.00 A P Mode: Paused
+3.50 Vs PSwitch Heater: ON
+0.00 A - Magnet in Persistent Mode
+0.00 Vm Press PER.SW.CTRL. to exit