Output Connections; Figure 3-5: External Sense Cable Shield Connection To Chassis Ground - California Instruments MX30-1 User Manual

User Manual – Rev AJ
3.6 Outpu t Connect
3.6.1 O tpu u t Wiring
The output terminal blocks, TB1A and TB1B are located at the front of the unit behind the
bottom access panel. See Figure 3-2 for details.
Three phase output line connections are made to
labeled A, B and C. The neutral connection (if needed) can be made on terminal block TB1B. If
the model used is an MX30-1, MX30-3Pi, MX45-1 or MX45-3Pi with single-phase capability, the
single phase A output connection is available on TB1B as well. Note that the neutral for either
single or three-phase mode is always located on TB1B. The neutral connection is always
required for single-phase output mode on an MX30-3Pi or MX45-3Pi and may be used if needed
for the EUT for all three-phase output modes.
The external sense inputs allow the power system output voltages to be monitored directly at the
load and must be connected at TB2 when the sense is programmed for external. The external
sense input does not have to be connected when Internal Sense is programmed. The external
sense wires are to be connected to TB2 on the rear panel and should be run using a twisted
shielded cable. See Figure 3-4 for location of TB2 and Figure 3-5 for shield connection detail.
Note: For External Sense connection, a shielded cable MUST be used with the shield
connected to chassis ground at the Ext. Sense connector. (See Figure 3-5).
External sense is recommended for multi-cabinet systems is the output wiring from the cabinets
to the common output terminal block supplied is not of equal length.

Figure 3-5: External sense cable shield connection to chassis ground

Note: The output of the power source is isolated from the input line and floating with
respect to chassis ground. If needed, either side (HI or LO) may be grounded.
If the EUT changes frequently, you may want to consider using some quick disconnect scheme
external to the MX so it will not be necessary to power down the MX and remove the front
42
ions
terminal block TB1A. The phase outputs are
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MX Series