KEPCO RKW 1500W Series Operator Manual - Manual (Page 12)

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228-1503 REV 4 060110
For a single remote ON-OFF signal to turn off all parallel-connected units, connect together all
+RC terminals and connect together all –RC terminals. Figure 9 illustrates connection of up to four
(maximum) power supplies in parallel.
N+1 Redundancy. An N+1 system requires one additional power supply than necessary to supply
the load. If one of the parallel-connected units fail, the others will continue to provide power to the
load without down time. For redundancy, add isolation diodes as shown in Figure 9.
FIGURE 9. PARALLEL CONNECTION WITH CURRENT BALANCING
6.3.1 CURRENT BALANCING
Current equalization conditons required for up to four RKW 1500W units in parallel are:
1. Output current of each power supply should be within 20 to 90% of the total output current
rating.
2. The output voltage of any Power Supply individually must be within 2% maximum of the
other power supply output voltage setting.
variation of output voltage in each power supply
3. The expected current sharing is such that the output current variation for each power supply
is less than or equal to 10% of each power supply rated output current.
6.3.2 MASTER-SLAVE CONFIGURATIONS
Master-slave operation allows the output voltage of all the power supplies connected in parallel to
be adjusted at the same time by using the Vadj control on the designated master power supply.
6.3.2.1 MASTER-SLAVE, MULTIPLE LOADS
Figure 10 shows the master-slave connection of three power supplies in parallel, each having an
independent load, with output voltage controlled by the Vadj control of the master power supply.
Use shielded wire (recommended) or twisted wires for connections to RV and –S terminals.
FIGURE 10. PARALLEL CONNECTION, MASTER-SLAVE, MULTIPLE LOADS
Maximum Voltage Minimum Voltage –
Rated Voltage
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