American Magnetics 4Q1005PS-430 Integrated Power Supply System - Manual (Page 72)

54 Rev. 5
Operation
Setup Menu : Load
then makes the voltage and current measurements, calculates the
inductance and then displays the result.
3.10.2.6 PSwitch Installed
This picklist value indicates whether or not a persistent switch is
installed. If YES is selected, the PSwitch Current Detect, PSwitch
Current, PSwitch Heated Time, PSwitch Cooled Time, PSw P/S
Ramp Rate, and PSwitch Cooling Gain settings are made available
within the Load submenu. If NO is selected, these settings are not
made available within the Load submenu and the PERSIST.
SWITCH CONTROL key becomes inoperable. The default value is
YES unless preset by AMI to match a specific superconducting
magnet.
3.10.2.7 PSwitch Current Detect (mA)
This function will automatically determine the proper value of
heater current in a persistent switch installed on a magnet
connected to the power supply system. The power supply should be
energized and at zero current. When the ENTER key is pressed to
start the process, the following occurs:
1. The persistent switch current is set to 0.1 mA.
2. The power supply current is ramped to 2 A at 0.1 A/sec.
3. After the power supply current reaches 2 A, the persistent switch
current is slowly increased (as shown on the display) until the
Model 430 Programmer detects a change in the load, indicative of
the persistent switch transitioning from superconducting to
resistive. Before this transition is detected, the display will show
the heater current value as it is increased in the persistent switch
+46.19 A Magnet Inductance (H)
+0.50 Vs 32.13
+50.00 A — PSwitch Installed?
+0.50 Vs NO YES
+00.00 A
P PSwitch Current Detect(mA)
+0.50 Vs Auto detect