KEPCO RKW 1500W Series Operator Manual - Manual (Page 13)

228-1503 REV 4 060110
11
6.3.2.2 MASTER-SLAVE, SINGLE LOAD
Figure 11 shows the connection of three power supplies in parallel to a single load. The output
voltage of all power supplies is controlled by Vadj of the master. Current balancing is implemented
to equalize the load current (see PAR. 6.3.2). NOTE: Use shielded wire (recommended) or twisted
wires for connections to RV and –S terminals. Match impedance of load wires between each
power supply and load by using the same wire lengths and wire sizes.
FIGURE 11. PARALLEL CONNECTION, MASTER-SLAVE, SINGLE LOAD
6.4 SERIES CONNECTION
Units may be connected in series to obtain higher voltages. When a number of power supplies are
operating in series, the current rating is to be limited to the rating of the power supply with the low-
est rating. Each Power Supply in series should be protected by a diode connected in parallel with
the output as shown in Figure 12. The diode protects against reverse voltages. It should be rated
for typically, V
REVERSE
>/= 2 x ΣV
OUT
of the series connection, I
FORWARD
>/= 2 xI
OUT
of the series
connection).
FIGURE 12. SERIES CONNECTION
6.5 PRELIMINARY ELECTRICAL CHECK
Connect an adjustable load across the power supply output bus bars, on the right side of the
front panel (see Figure 6). The load must have a dissipation rating of at least 3000 Watts. Con-
nect a voltmeter and an oscilloscope across the power supply monitor terminals (should be
linked to the respective sensing terminals, +S and –S). The oscilloscope must be isolated from the
source and grounded at the load. Use an isolation transformer between the test equipment and
the AC input power (see Figure 13).
Connect the AC input power to the line, neutral and ground terminals (see Figure 6). Turn source
power on and check the output voltage both with and without load. The output voltage can be
adjusted within the published range by using the front panel voltage control trimmer Vadj