Xantrex XKW 12-150, Operating Manual

Page: 46 / 90

Installation
Using Remote Sensing
44
Operating Manual for XKW 3kW Series Power Supply
8. Press the STANDBY switch to its OUT position to apply power to the load.
Using Remote Sensing
Remote sensing is used during voltage mode operation to shift the power supply's
regulation point from its output terminals (default sense point) to the load or
distribution terminals by using a separate pair of wires to monitor the load voltage.
Remote sensing allows the power supply to compensate for voltage losses in the load
lines (up to 1V per line) which will otherwise degrade the regulation of the supply.
The sense line connection points are located on the rear panel J3 connector.
“Configuring for Remote Programming, Sensing, and Monitoring” on page 48 has
more information about making J3 connector changes.
Connecting
Remote
Sensing
Lines
Sense wires can be any size (24 AWG or larger) but in high noise environments or
when the lowest possible power supply ripple is required, sense wires must be
twisted and/or shielded.
To connect remote sense lines, refer to Figure 2.10 and to the following procedure:
1. Ensure the power supply is turned OFF. Allow five (5) minutes to elapse to
dissipate stored energy before altering J3 connector pin connections.
2. Remove the local sense jumpers connecting J3 pins 13 to 25 (positive sense) and
pins 12 to 24 (negative sense or return sense).
3. Connect the positive sense lead to pin 13 and the negative lead to pin 12. Use
shielded-twisted pair wiring of 24 AWG or larger for sense lines.
4. Ground the sense line shield, at one point only, to the power supply's return
output connection at the load, or, to the power supply's return output at its output
terminal, or to the power supply's chassis.
5. The optimal point for the shield ground must be determined by experiment, but
the most common connection point is at the power supply's return output
connection at the load.
6. Turn the power supply ON.
Notes:
•
If the power supply is operated with remote sense lines connected and with either
of the positive or negative load lines
not
connected, the power supply shutdown
circuit will be activated, causing the output voltage and current to fall to zero.
!
CAUTION
Do not use remote sensing with multiple supplies connected in series or in parallel.
TM-25OP-01XN.book Page 44 Monday, April 5, 2004 8:58 AM