American Magnetics 03300PS-430-601 High Stability Integrated Power Supply System - Manual (Page 190)

172 Rev. 5
Appendix
Model 601 and Energy Absorption
A.13 Model 601 and Energy Absorption
In order to provide magnet discharge current control with a unipolar
power supply, AMI introduces the Model 601 Energy Absorber into the
current loop (refer to “Dual-Quadrant Operation” on page 10 and Figure 3-
8 on page 50).
A.13.1 Model 601 Specifications
The AMI Model 601 Energy Absorber is designed to provide a compact,
fast-rampdown option of up to 5 Vdc for AMI power supply systems. The
Model 601 is designed to operate safely in the event of loss of facility ac
power by drawing the necessary power for internal cooling from the
superconducting magnet. Upon loss of ac power to a power supply system,
the Model 601 will ramp the system to zero current at a discharge rate of
approximately 5 Vdc.
A.13.2 Connecting Multiple Model 601 Energy Absorbers
The AMI 03300PS-430-601 bipolar power supply system incorporates
three Model 601 units operated in parallel. The positive (+) and negative
(-) lugs will be ganged together using conductive bus bars. The power
leads, from the supply and to the magnet, may be connected to any
mounting lug if an additional lug is not provided in the bus bar.
In addition to the ganged lugs, the coaxial connectors on the rear of each
Model 601 must all be connected together with coaxial cables — no BNC
terminators should be used. Use standard BNC “T” adaptors on the inner
unit.
Table A-14. Model 601 Energy Absorber Specifications
Parameter Value
AC Input (to AC power adapter) 100 to 240 Vac ± 10%, 50/60 Hz, 100 VA max
DC Input (from AC power adapter) 5 Vdc ± 5%, 4 A max
Maximum Magnet Operating Current 130 A @ 25°C, derated linearly to 100 A @ 40°C
Nominal Discharge Voltage 5.0 Vdc ± 2%
Discharge Voltage Temperature Coefficient ± 150 ppm/°C max
Internal Series Resistance
a
a. Nominally adds 200 mV voltage drop at 100 A
2 m Ω ± 1 m Ω
Rated Operating Temperature 0 to 40°C @ 100 A, 0 to 25°C @ 130 A
Rated Operating Relative Humidity 0 to 95% non-condensing
Torque Limit on Current Terminals 48 lbf-in.