American Magnetics 420 Power Supply Programmer - Manual (Page 46)

28 Rev. 7
Installation
High-Resolution Four Quadrant Supply
d. Connect the coaxial cable from the 352*5$0 287 connector on
the back of the Model 420 to the 352*5$0 ,1 connector (7) on the
rear of the power supply.
e. Install an instrumentation cable between the magnet support
stand top plate connector (8) and the magnet station connector J7A
or J7B.
f. Install an instrumentation cable between the LHe/Temp connectors
J8A and/or J8B on the rear of the Model 420 and the Model 13x
Liquid Helium Level Instrument and/or temperature instrument
(9).
g. Remote communications via IEEE-488 and/or RS-232 (or optional
RS-422) can be accomplished by connecting suitable cabling to J11
and/or J12, respectively.
2.5.6 Low-Current, High-Resolution Four-Quadrant Supply
AMI offers a low-current (5 A or 10 A maximum) system option to achieve
high-resolution control of the magnet current. The system consists of a
Model 420, a low-current four-quadrant power supply (typically the Kepco
BOP series), and associated interconnecting cabling. Figure 2-6 illustrates
the interconnects for a Kepco BOP 20-5M or 20-10M power supply.
Note
Due to continuous discharge voltage limitations present in the Kepco
BOP series supplies, the charging/discharging voltage is limited to
a maximum of 10 volts by the Model 420 for maximum safety.
Connect the cabling in the following manner:
a. Connect the positive (+) power supply terminal (1) to the positive
vapor-cooled current lead (2) using 1/4-20 or similar hardware.
b. Connect the negative vapor-cooled current lead (3) to the positive
(+) shunt terminal (4) on the back of the Model 420.
Caution
Do not overtighten the nuts on the current shunt terminals of the
Model 420 (see the torque specifications on page 7). Overtightening
can result in damage to the terminals.
c. Connect the negative (
−
) shunt terminal (5) on the back of the
Model 420 to the negative (
−
) power supply terminal (6).