American Magnetics 05100PS-430-601 Integrated Power Supply System - Manual (Page 60)

42 Rev. 5
Operation
LED Indicators : Field At Target
3.8.2 Magnet Status Indicators
Four LEDs are grouped together to show the magnet status.
3.8.2.1 Field At Target Indicator
The green FIELD AT TARGET LED indicates that the current is at
the target value. If the magnet is not in persistent mode (persistent
switch heater is on), then this is an indication that the magnet field
has reached the target value. If the magnet is in persistent mode,
then this is an indication that the current being supplied to the
magnet system has reached the target value.
3.8.2.2 Magnet In Persistent Mode Indicator
Caution
If the Model 430 Programmer power is turned off while the
persistent switch is heated, persistent switch heating will be lost and
the magnet will enter persistent mode. The Model 430 will not have
a record of that event. Therefore the MAGNET IN PERSISTENT
MODE LED state will be incorrect (remain OFF ) when the Model
430 Programmer power is restored.
Caution
If the Model 430 Programmer power supply system is powered off
and moved from one magnet system to another, the MAGNET IN
PERSISTENT MODE LED may not correctly indicate the state of the
magnet system until the first time the persistent switch heater is
turned off.
Also, should the magnet quench while the magnet is in persistent
mode and the Model 430 Programmer is off, the persistent mode
indicator LED will be incorrect when the Model 430 Programmer is
turned on again.
The green MAGNET IN PERSISTENT MODE LED indicates that
the persistent switch heater is off, and that when it was turned off,
the magnet had greater than 100 mA of current flowing through it.
Figure 3-6. Magnet Status LED Indicators.