Output Connections; Figure 3-5: External Sense Cable Shield Connection To Chassis Ground - Ametek California Instruments MX15 Series User Manual

3.6 Output Connections

3.6.1 Output Wiring
The output terminal block, TB1, is located at the back of the unit behind the bottom access
panel. See Figure 3-2 for details.
Single phase output line connections are made to terminal block TB1. The outputs are labeled
HI and LO.
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 where 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 MX15 so it will not be necessary to power down the MX15 and remove the front
covers. This can take the form of a panel-mounted socket of sufficient current and voltage
rating. (Not supplied with MX15)
The output power cables must be large enough to prevent a total voltage drop exceeding 1% of
the rated output voltage between the power source and the load. Table 3-2 shows the size of
the cables that may be used. Note that wires must be sized to accommodate the maximum
current that is available. Size the wires for the lowest available voltage range as the currents will
be highest in that range.
MX15 Series
Shield
Connection
39