User Manual – Rev BE AMETEK Programmable Power
MX Series 57
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 covers. This can take the form of a panel-
mounted socket (1 or 3 phase) of sufficient current and voltage rating. (Not
supplied with MX)
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. This may
be a function of the voltage range and phase mode on some MX models. If the
MX has more than one output voltage range, size the wires for the lowest
available voltage range as the currents will be highest in that range.
Cable lengths must not exceed twenty-five (25) feet. For lengths greater than
25 feet, calculate the voltage drop from the following formula:
2 X DISTANCE X CABLE RESISTANCE PER FT. X CURRENT = VOLT DROP
65 AMPS 6 AWG 26.24 13.3
130 AMPS 4 AWG 41.74 21.1
260 AMPS 1/0 AWG 105.6 53.5
400 AMPS 2/0 AWG 133.1 67.4
Table 3-2: Suggested Output Wiring Sizes *
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