American Magnetics 4Q12125PS-430 High Stability Integrated Power Supply System - Manual (Page 31)

Rev. 3 13
Installation
High-Current Four-Quadrant Supply
example of the data to be entered and how it is entered is described in
section 3.11 on page 72.
If the Model 430 Programmer was purchased as part of a magnet system,
essential data will have already been entered at the AMI factory and a
configuration sheet will have been provided detailing the settings.
2.5 System Interconnects
If the Model 430 Programmer was purchased as part of a magnet system,
all applicable system components and wiring harnesses will have been
shipped with the system.
Multiple power supplies should be connected to the same AC input power
source. The protection is configured so that a fault will shut down all the
interconnected power supplies.
The diagrams that follow will assist in system equipment setup.
Caution
The wiring between the power supply and the magnet current leads
must be of sufficient size to carry the full rated current of the power
supply. Typically, for short runs (less than 25 ft, or 7.6 m), 2 AWG
wire is sufficient for 125 A current, and 2/0 AWG wire is best for
250 A current.
Note that an AMI Model 13x Liquid Helium Level Instrument is shown as
a possible component of each integrated system. The main
instrumentation cable connecting the magnet support stand to one of the
Model 430 Programmer MAGNET STATION connectors contains all the
instrumentation and control connections needed to control and monitor
the magnet. The signals in this cable which are required to monitor LHe
level and temperatures are also presented at the LHe Level / Temp
Connectors. Refer to the Appendix for pin-outs of these and other
connectors.
2.5.1 High-Current, High-Stability 4-Quadrant Supply
Current stability of the system can be increased by an order of magnitude
through application of the zero flux method of current sensing. For the
four-quadrant high-current High-Stability Model 4Q12125PS-430 Power
Supply System, the components include the zero flux current sensing
system, a Model 430 Programmer, two Model 4Q06125PS four-quadrant
power supplies, and associated interconnection cabling. Figure 2-1
illustrates the interconnects for a High-Stability Model 4Q12125PS-430
Power Supply.