American Magnetics 601 Manual

Rev. 6, August 2022
EXCELLENCE IN MAGNETICS AND CRYOGENICS
American Magnetics, Inc.
P.O. Box 2509, 112 Flint Road, Oak Ridge, TN 37831-2509
Phone: [phone] Fax: [phone]
Internet: http://www.americanmagnetics.com
E-Mail: [email protected]
AMI
AMI MODEL 601 ENERGY ABSORBER
INSTALLATION, OPERATION, AND
MAINTENANCE INSTRUCTIONS
I. INTRODUCTION
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.
II. SPECIFICATIONS @ 25°C
AC Input Ratings: . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 to 240 VAC ± 10%, 50/60 Hz,
100 VA max
DC Input Ratings:. . . . . . . . . . . . . . . . . . . . . . . . . . . 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:1. . . . . . . . . . . . . . . . . . . 2 m± 1 m
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: . . . . . . . . . . . . 50 in-lbs.
1(nominally adds 200 mV voltage drop at 100 A)
Instruction manual symbol: the product is marked with this symbol when it
is necessary for you to refer to the instruction manual in order to protect
against damage to the product or personal injury.

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III. INSTALLATION
The AMI Model 601 is designed to operate in an AMI power supply system consisting
of a unipolar power supply, a power supply programmer, and a superconducting
magnet. The following paragraphs document the procedures and interconnects
necessary to use the Model 601.
WARNING: If the Model 601 is used in a manner not specified by AMI,
the protection provided by the equipment may be impaired.
A. Carefully remove the Model 601 from the shipping container and remove all packaging
material.
NOTE: If there is any shipping damage, save all packaging material
and contact the shipping representative to a file a damage claim. Do not
return the instrument to AMI unless prior authorization has been
received.
B. If the Model 601 is to be mounted in a rack:
Install the Model 601 in a 19" wide instrument rack by securing the front panel to
the rail in each of the four corners with mounting hardware supplied by the cabinet
manufacturer.
WARNING: The Model 601 must have sufficient cooling air to prevent
damage from overheating. The cooling air inlets on the front panel and
the cooling air outlets on the rear panel must not be obstructed.
C. Install the Model 601 in a magnet power supply system by completing the following
steps:
CAUTION:Do not overtighten the nuts on the current lugs of the Model
601 (maximum torque is 50 in-lbs). Overtightening can result in
damage to the terminals.
1. Connect a power lead cable from the power supply positive (+) output lug to the
positive (+) lug on the rear of the Model 601. No other connections should be made
to the Model 601 positive (+) lug.
2. Connect a power lead cable to the negative () lug on the rear of the Model 601 to
the positive (+) current lead of the superconducting magnet. No other connections
should be made to the Model 601 negative () lug.
WARNING:Exercise care near the power lugs when operating a
magnet. Metallic objects shorted across the lugs may conduct large DC

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currents which are capable of melting the object and causing severe
burns.
CAUTION:Current flow should be from the positive (+) to negative ()
lug of the Model 601. If this is reversed, severe damage of the Model 601
will result.
NOTE:If an AMI Model 430 Power Supply Programmer is to be used
with the system, refer to the appropriate installation section in the
Model 430 Power Supply Programmer manual for a complete system
diagram and step-by-step instructions for all the system interconnects.
D. If you have purchased multiple Model 601 units with the Parallel Operation Option,
then up to five Model 601 units may be operated in parallel with a total current rating
of 90% of the sum of the ratings for each individual unit.
Typically, if multiple Model 601 units are to be connected, the positive (+) and negative
() lugs will be ganged together as illustrated below using a conductive plate. Simply
follow the installation directions in Step C above by treating each ganged lug as a
single output lug. 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 ganged
conductive plate.
In addition to the ganged lugs, the coaxial connectors on the rear of each Model 601
must also be connected. If more than two units are connected in parallel, the middle
units may be connected to the coaxial cable by using standard BNC “T” adaptors. The
“end” units should be connected directly to the coaxial cable — no BNC “terminators”
should be used.
E. Supply power to the Model 601 by connecting the supplied external DC power
converter to the matching connector at the rear of the Model 601, and then connecting
the AC power cord to the appropriate power receptacle. The Model 601 is operational
Ganged negative lugs
Ganged positive lugs Coaxial interconnect
for parallel operation

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immediately upon connection to a power receptacle.
WARNING: Do not position the external power supply or the Model 601
so that it is difficult to disconnect the power cords.
The Model 601 DC power converter is designed to operate with 50/60 Hz power and
voltages of 100 to 240 VAC ± 10%.
NOTE:If the Model 601 is operated without supplied power, the unit
will function normally at currents above 0.5 A. Below 0.5 A, the Model
601 will not develop the full discharge voltage of 5 volts if operated
without power supplied to the rear-panel DC power converter connector.
Operation without supplied power is only provided as a safety feature
for situations where all facility power is lost to the magnet system. The
Model 601 should not be routinely operated without supplied power.
IV. OPERATION
A. During normal operation of the Model 601, no operator intervention is required.
B. The Model 601 is operating correctly if the FAULT LED is not energized.
C. If the FAULT LED is energized, then one or more of the internal energy absorbing
elements has malfunctioned or power has been lost to the rear-panel power connector.
An audible alarm will also sound when the FAULT LED is energized. If the unit is in
operation, proceed immediately to a safe magnet system state (typically zero current or
a cooled persistent switch in a connected magnet). Do not continue to operate the unit
and refer to the Troubleshooting section below for further direction.
D. Remember to adjust the voltage limit settings of any power supply programmer to
account for the additional voltage (5 V) required to operate the system with a Model
601 installed.
WARNING: The Model 601 must have sufficient cooling air to prevent
damage from overheating. The cooling air inlets on the front panel and
the cooling air outlets on the rear panel must not be obstructed.
V. TROUBLESHOOTING
A. The magnet system does not appear to charge.
1. Check the system wiring and verify that the current flow direction through the
Model 601 is from the positive (+) to the negative () lug.
2. Verify that the supplied external DC power converter is connected to the rear of the

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Model 601, and the AC power cord is also connected to the appropriate power
receptacle.
3. Check the voltage limit settings of any power supply programmer and verify the
limits are set to a value greater than 5 volts plus the charging voltage and any
power lead voltage drops.
B. The system current ramps slowly from zero.
If the Model 601 is used in conjunction with an AMI Model 430, then an initial
charging delay will be observed when operating without an inductive load (e.g. a
persistent switch is not heated on a connected magnet). To decrease the amount of
time delay, increase the ramp rate to 1 A/sec or greater value. Remember to
decrease the ramp rate, if necessary, before heating the persistent switch of the
connected magnet and attempting to ramp the current. The charging delay will not
be observed when operating with an inductive load.
C. The FAULT LED is energized with audible alarm.
1. Verify that the supplied external DC power converter is connected to the rear of the
Model 601, and the AC power cord is also connected to the appropriate power
receptacle.
2. If the DC power converter is connected properly, observe if an internal green LED
is energized by looking through the rear-panel grating. If the green LED is
energized, then the DC power converter is operating correctly.
If the green LED is not energized, then the DC power converter has failed, or
AC power to the DC power converter has been lost. Contact an Authorized AMI
Technical Support Representative for a replacement.
3. If the DC power converter is connected and the internal green LED is energized,
then the FAULT LED indicates the failure of an internal energy absorbing
element. Do not continue to operate the unit and contact an Authorized AMI
Technical Support Representative for further instructions.
VI. MAINTENANCE
The only routine maintenance required is to keep the exterior surfaces of the
instrument clean by gently wiping with a damp cloth moistened with a mild detergent.
The front and rear panel vents of the Model 601 should also be kept free of obstructions
or excessive dust to allow for proper cooling of the unit.
VII. WARRANTY
All products manufactured by AMI are warranted to be free of defects in materials and

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workmanship and to perform as specified for a period of one year from date of
shipment. In the event of a failure occurring during normal use, AMI, at its option, will
repair or replace all products or components that fail under warranty, and such repair
or replacement shall constitute a fulfillment of all AMI liabilities with respect to its
products. All warranty repairs are F.O.B. Oak Ridge, Tennessee, USA.
VIII.RETURN AUTHORIZATION
Items to be returned to AMI for repair (warranty or otherwise) require a return
authorization number to ensure your order will receive the proper attention. Please
call an AMI representative at [phone] for a return authorization before
shipping any item back to AMI.