American Magnetics 4Q1010PS-430 Integrated Power Supply System - Manual (Page 165)

Rev. 5 147
Appendix
Shunt Terminals
The connectors route the incoming signals from the Magnet Station
Connectors to external level and/or temperature instruments. If an AMI
Liquid Helium Level Instrument is purchased with the Model 430
Programmer and magnet system, an LHe level cable will be provided.
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 LHe Level / Temp Connector shell.
A.3 Programmer Shunt Terminals
The shunt terminals should be connected so that positive conventional
current flows from the + terminal to the − terminal. Refer to section 2 on
page 11 for a detailed description 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 shunt terminals of the Model 430
Programmer (refer to specifications in table on page 8).
Overtightening can result in damage to the terminals.