American Magnetics 4Q12125PS-430 High Stability Integrated Power Supply System - Manual (Page 74)

56 Rev. 5
Operation
Setup Menu : Load
120 seconds
1
. The value can be set by using either the numeric
keypad per section 3.3 on page 25 or the fine adjust knob
(section 3.4 on page 26). The default is 20 seconds unless preset by
AMI to match a specific superconducting magnet.
During the persistent switch heating period, the Model 430
Programmer ramping functions are disabled. The time delay is
necessary to ensure that the Model 430 will not switch to the higher
gain required for proper magnet operation before the magnet is
actually available in the circuit (not being shunted by the
persistent switch). If magnet operation is not stable after
expiration of the heating period, increase the heated time to allow
more time for the switch to heat. The default value of 20 seconds is
adequate for the majority of wet and dry persistent switches.
3.10.2.10 PSwitch Cooled Time
The PSwitch Cooled Time is the amount of time required for the
persistent switch to cool completely and become fully
superconducting. The time may be set to any value between 5 and
3600 seconds 2 . The value can be set by using either the numeric
keypad per section 3.3 on page 25 or the fine adjust knob
(section 3.4 on page 26). The default is 20 seconds unless preset by
AMI to match a specific superconducting magnet.
During the persistent switch cooling period, the Model 430
Programmer ramping functions are disabled. The default value of
20 seconds is adequate for the majority of wet persistent switches.
Persistent switches on conduction cooled magnets (dry switches)
will require significantly longer cooling times than wet switches.
3.10.2.11 PSwitch Power Supply Ramp Rate
The persistent switch power supply ramp rate is the rate at which
the magnet power supply will automatically be ramped up or down
while an installed persistent switch is in the cooled state. The rate
1. During the heating cycle, a “countdown” will be displayed indicating the number of
seconds remaining in the cycle.
2. During the cooling cycle, a “countdown” will be displayed indicating the number of
seconds remaining in the cycle.
+50.00 A — PSwitch Cooled Time (sec)
+0.50 Vs 20
+50.00 A — PSw P/S Ramp Rate (A/sec)
+0.50 Vs 10