AMETEK Compact i/iX Series - Manual (Page 37)

User Manual Compact i/iX Series
AMETEK Programmable Power California Instruments 37
3.6 Output Connections
3.6.1 Output Wiring
The output terminal blocks for each unit are located at the rear of the unit. Output connections are
made to the terminal block labeled OUTPUT. For a two-box system, the output terminals from both the
master and auxiliary units must be connected together. See Figure 3-7.
The external sense inputs allow the power system output voltages to be monitored directly at the load
and must be connected at output terminal connector. The external sense wires should be run as a
twisted pair for short lengths. Sense leads over three (3) feet long should be run as a twisted shielded
pair.
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.
The output power cables must be large enough to prevent a total voltage drop exceeding 3 % of the
programmed output voltage between the power source and the load. Note that wires must be sized to
accommodate the maximum current that is available. This may be a function of the voltage range.
Always use the current available on the low voltage range to size the wires.
For cable lengths less than 25 feet, the following wire gauge is recommended:
Wire Gauge Metric Diameter Nearest Metric Equivalent
AWG12 2.05 mm 4 mm
2
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