American Magnetics 420 Power Supply Programmer - Manual (Page 125)

Rev. 7 107
Appendix
Current Shunt Terminals
Warning
Although the LHe level sensor connector terminals are isolated from
earth ground and therefore touching one terminal is not hazardous,
the voltage between terminals is at a hazardous potential if an AMI
Liquid Helium Level Instrument is connected and energized. The
LHe level sensor pins are designed for use with an AMI LHe sensor
and the wiring for the sensor is to have no live parts which are
accessible. Conductors connected to its terminals must be insulated
from user contact by basic insulation rated for 150 VAC
(Category I).
Note
For maximum noise immunity, use shielded cabling and connect
one end of the shield to the J8A or J8B connector shell.
A.3 Current Shunt Terminals
The Current Shunt Terminals should be connected so that positive
direction current flows from the + terminal to the
−
terminal. Refer to the
diagrams in the Installation section (page 13) for detailed descriptions of
the system interconnections.
Warning
Exercise caution near the shunt terminals when operating a magnet.
Metallic objects shorted across the shunt terminals may conduct
large DC currents which are capable of melting the object and
causing severe burns.
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.
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