User Manual
2253i / 2253iX
AMETEK
California Instruments
38
3.6 Output Connections
3.6.1 Output Wiring
The output terminal block is located at the rear of the unit. Output connections are made to the
terminal block labeled OUTPUT. This terminal block has four posts: A, B, C and N (neutral or
common).
The external sense input connector is located in the lower center of the rear panel and allows the
output voltages to be monitored directly at the load. For external sense mode of operation, these
sense connections must be connected at the load using the provided mating connector. The external
sense wires should be run as twisted pairs for short lengths. Sense leads over three (3) feet long
should be run as a set of twisted shielded pairs.
Note: The outputs of the power source are isolated from the input line and floating with
respect to chassis ground. If needed, the Neutral 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:
Mode
Wire Gauge
Metric Diameter
Nearest Metric Equivalent
3 Phase
AWG14
1.628 mm
2 mm
2
1 Phase
AWG12
2.053 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
