American Magnetics 4Q12125PS-430 High Stability Integrated Power Supply System - Manual (Page 96)

78 Rev. 5
Operation
Persistent Switch Control : Initial Heating of the Switch
See section 3.6.1 on page 29 for details of the use of the PERSIST. SWITCH
CONTROL key.
3.13.1 Procedure for Initial Heating of the Switch
The Model 430 Programmer remembers the state of the persistent switch
during the time that the Programmer is de-energized. If the Model 430 is
turned on when its shut down state was such that the persistent switch
was heated and Programmer commanding zero current (the normal mode
after the magnet has been discharged), the following screen will be
displayed.
1
In order to charge the magnet, the persistent switch heater must be
energized. Perform the following steps.
1. Turn on the persistent switch heater by pressing the PERSIST.
SWITCH CONTROL key to heat the persistent switch heater.
2. After the persistent switch heater has been heated for the preset
heating time as set by the PSwitch Heated Time variable, the
display will show the default display and wait at zero current for a
command from the operator.
3.13.2 Procedure for Entering Persistent Mode
In order to enter the persistent mode of magnet operation, the user should
perform the following steps:
1. Use either automatic or manual ramping to achieve the desired
field or current in the magnet.
1. Refer to section 3.1 on page 21.
+0.00 A
P
Mode: Paused
+0.00 Vs PSwitch Heater: OFF
+0.00 A Mode: Heating Switch (4)
+0.00 Vs PSwitch Heater: ON
+0.00 A P Mode: Paused
+0.00 Vs PSwitch Heater: ON