American Magnetics 4Q1010PS-430 Integrated Power Supply System - Manual (Page 101)

Rev. 5 83
Operation
Persistent Switch Control : Exiting Persistent Mode
5. The persistent switch heater is heated for the preset heating time
as set by the PSwitch Heated Time variable 1 .
Note
The magnet voltage (Vm) is monitored during switch heating. If the
voltage is greater than, 0.5 V, the Model 430 Programmer will beep
and display a message to indicate a mismatch between the magnet
current and power supply current:
This mismatch in current indicates the magnet current (and
therefore the field) has decayed significantly during the time
the magnet was in persistent mode. Since this is not a critical
error
2
, after 15 seconds the screen will change back to the
default display:
6. After the Model 430 Programmer has completed this persistent
switch heating operation, the display reads:
1. Refer to section 3.10.2.9 on page 55. The (4) in the display indicates the number of
seconds remaining in the heating cycle (4 in this example).
2. This current mismatch could be indicative of a problem with the magnet persistent
joints.
+50.00 A Mode: Heating Switch (4)
+3.50 Vs PSwitch Heater: ON
+50.00 A Mode: Heating Switch (4)
+3.50 Vs *** Current Mismatch ***
+50.00 A P Mode: Paused
+3.50 Vs PSwitch Heater: ON
+50.00 A
P
Mode: Magnet in Driven Mode
+3.50 Vs Press ENTER to continue