10
RTW 300W 042111
6.3.1 CURRENT BALANCING
Current balancing (equalization) conditions required for up to four RTW 300W 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.
FIGURE 8. PARALLEL CONNECTION WITH CURRENT BALANCING
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 9 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. If
optional Cable Kit 219-0493 (PAR. 6.6) is used, the wire at pin3 (CB) must be cut. NOTE: Vadj
control of all slave units must be set to maximum counterclockwise for this configuration to oper-
ate properly.
FIGURE 9. PARALLEL CONNECTION, MASTER-SLAVE, MULTIPLE LOADS
Maximum Voltage
Minimum Voltage
–
Rated Voltage
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2 %
=
3. SET VADJ OF SLAVE UNITS TO MAXIMUM
COUNTERCLOCKWISE.
