User Manual – Rev AJ California Instruments3.6 Outpu ionst Connect3.6.1 O tpuu t WiringThe output terminal blocks, TB1A and TB1B are located at the front of the unit behind thebottom access panel. See Figure 3-2 for details.terminal block TB1A. The phase outputs areThree phase output line connections are made tolabeled A, B and C. The neutral connection (if needed) can be made on terminal block TB1B. Ifthe model used is an MX30-1, MX30-3Pi, MX45-1 or MX45-3Pi with single-phase capability, thesingle phase A output connection is available on TB1B as well. Note that the neutral for eithersingle or three-phase mode is always located on TB1B. The neutral connection is alwaysrequired for single-phase output mode on an MX30-3Pi or MX45-3Pi and may be used if neededfor the EUT for all three-phase output modes.The external sense inputs allow the power system output voltages to be monitored directly at theload and must be connected at TB2 when the sense is programmed for external. The externalsense input does not have to be connected when Internal Sense is programmed. The externalsense wires are to be connected to TB2 on the rear panel and should be run using a twistedshielded 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 shieldconnected 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 cabinetsto the common output terminal block supplied is not of equal length.Figure 3-5: External sense cable shield connection to chassis groundNote: The output of the power source is isolated from the input line and floating withrespect 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 schemeexternal to the MX so it will not be necessary to power down the MX and remove the front42 MX Series
