System Features
The 12100PS-420 Power Supply System consists of an AMI Model 420 Programmer, configured for 100 A operation, and an AMI 12100PS DC power supply.
The Model 12100PS-420 is a reliable, compact, and economical superconducting magnet power supply system which provides up to 100 amps at up to 12 volts. The power supply is a low-noise switching design. This topology allows for a compact power supply system with low output noise at an affordable price. The Model 12100PS-420 system provides for finely-controlled charging of the inductive superconducting magnet load and eliminates magnet current oscillations.
It is recommended that for high-inductance loads where the stored energy must be reduced quickly, a Model 601 Energy Absorber should be purchased with the Model 12100PS-420 Power Supply System. Without a Model 601, the maximum discharge rate is limited by the resistance of the power leads connecting the power supply and superconducting magnet (typically about 0.01 ohms).
The power supply is shipped preconfigured for "remote voltage commands output voltage" (i.e. voltage-to-voltage mode) to function as a slaved supply to the Model 420 Programmer.
Superior Resolution and Stability
The Model 420 Programmer utilizes 20-bit converters to translate signals between the analog and digital domains. Precision instrumentation techniques and potentiometer-free designs are employed throughout the instrument to ensure accurate signal translation for a wide range of conditions. The magnet current is sampled at a resolution of 0.2 mA. The encoder dial allows for fine adjustment at up to 15-digits resolution. All pause and hold functions are performed in the digital domain, which provides for excellent stability and low drift (<0.01%) of the programmed magnetic field.
Programmable Safety Features
The Model 420 Programmer is designed to allow the operator to program the system from the front panel, or remotely, with current and voltage limit parameters which will not be exceeded during operation of the system. Once set, should an operator inadvertently attempt to operate beyond the specified limits, the programmer will not accept the parameter and audibly beep. An appropriate error message is available via the remote interface. The Model 420 Programmer also automatically limits the charge rate of the magnet to the specified voltage limit.
The power supply system is also protected from any over-voltage, over-current, or over-temperature conditions.
The Model 420 Programmer provides visual indication of a magnet quench and automatically commands the power supply output voltage to zero volts. (A manually-operated standby switch is also available on the front panel of the power supply.) The operator is prevented from initiating a recharge of the magnet until the Model 420 front panel quench detection switch is reset. A rear-panel input is also available to accept a user-generated quench indication if required.
All specifications for the Model 420 Programmer apply (100 A configuration), plus the following system characteristics:
Specifications Input power: 100-120 or 200-240 VAC ±10%, 50-60 Hz Current (Imax): 100 A DC Voltage (Vmax): 12 V DC Output Power: 1200 VA Maximum Apparent Power Consumption: 2100 VA Noise (typical): 5 mV RMS Dimensions: 5.25" H x 19" W x 20" D Total System Weight: 26 lbs.
Ten feet of cabling is included to conveniently connect the system to the vapor cooled current leads of the superconducting magnet system. If purchased with an AMI magnet system, an integrated magnet station cable is also provided to route all non-power signals in one convenient multi-conductor cable.
Rev. 7 Model 420 manual in Adobe Acrobat 3.0 format (model420.pdf)
12100PS power supply manual in Adobe Acrobat 3.0 format (12100.pdf, 488 kB)
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