American Magnetics 05300PS-430-601 High Stability Integrated Power Supply System - Manual (Page 21)

Rev. 5 3
Introduction
General Description
more detail in section A.6.2 on page 157 of the Appendix. Contact AMI for
more information.
In addition to low LHe level, this input to the Power Supply System can be
used with other instrumentation as well. Other uses for this input include
faults from a cryocooler, temperature instrumentation, etc.
1.1.8 Model 05300PS-430-601 General Description
A Model 430 Power Supply Programmer and three AMI Model 08150PS
1200 Watt unipolar voltage and current stabilized DC Power Supplies are
configured with associated Model 601 Energy Absorbers to make up the
+300 A, ±5 Vdc bipolar system designated as 05300PS-430-601. The power
supplies are remotely controlled by the Model 430 Power Supply
Programmer, and are connected in a parallel configuration to provide the
rated current.
As a unipolar power supply, the Model 08150PS can only source 1 (not sink)
power. However, when the three-power-supply combination is used in
conjunction with three AMI Model 601 Energy Absorbers and controlled by
a single AMI Model 430 Power Supply Programmer, the result is the
bipolar Model 05300PS-430-601 integrated power supply system that is
ideal for driving inductive loads such as large magnets or motors.
The power supplies are controlled by a ±10 Vdc remote analog signal
supplied by the Model 430 Programmer and applied to the power supply
analog inputs. Programming and control of the current loop (composed of
the magnet, power supplies, Model 601 Energy Absorbers, and Model 430
Programmer zero flux device), is provided by a Model 430 ramp-generated
current reference with parameters as set by the user in the Model 430. The
Model 430 compares the measured current (via the zero flux device) with
the current reference to provide precise closed-loop control of the actual
current.
The power supply units are operated in voltage-voltage 2 programming
mode, with the Model 430 Programmer output scaled to operate the power
supply units over their available voltage output range. The Programmer
signal will continually adjust the power supply output voltage to
automatically regulate the power supply current; precise linear power
supply current control will result as long as the system voltage and
current demand do not exceed the total power supply rating or load
limiting parameters.
1. The power supply is operating as a source if the current direction and voltage polar-
ity are the same (i.e., the situation that would exist when supplying a resistive load).
If the voltage polarity and current direction are opposite, the supply is operating as
a sink.
2. Voltage reference controlling voltage output.