BOP HIPWR 111315 2-152.8 MULTIPLE UNIT CONFIGURATIONSParallel, series and series-parallel configurations of identical BOP units increases the rated volt-age and current range of the power supply. Up to five units can be connected in parallel toincrease the current: I MAX (one unit) x N P = IMAX (parallel combination) where N P = number of units inparallel. Similarly, up to three units can be connected in series to increase the voltage: E MAX (oneunit) x N S = E MAX (parallel combination) where N S = number of units in series. In addition, identicalunits may be connected in both series and parallel. The 2 X 2 configuration, two parallelbranches of two series-connected power supplies, doubles the output voltage and doubles theoutput current of a single unit. The 3 X 2 configuration, two parallel branches of three series-connected power supplies, triples the output voltage and doubles the output current of a singleunit. Multiple unit configurations require the appropriate Interconnection Kit (see Table 1-4).For all multiple unit configurations the master reports the system output parameters: voltage andcurrent; the slaves report the main channel parameter: voltage for series configurations or cur-rent for parallel configurations.Additional hex nuts are provided in the interconnection kit for sufficient cable separation so theycan be oriented as needed to fit onto the terminal.NOTE: Multiple unit configurations require that all individual units be properly calibrated. (Unitsshipped from Kepco have been factory-calibrated.) If not, refer to Section 4 to calibratethe individual units prior to connecting them in parallel or series. Using calibrated unitsensures that the multiple unit configuration is calibrated; calibrating the multiple unitconfiguration is neither needed nor possible.2.8.1 MULTIPLE UNIT CONNECTIONSBefore connecting the units in parallel or in series, configure each for master or slave (see PAR.2.8.4), and save for power up. Then turn off the units and proceed with the parallel or series con-nection. Figures 2-5 (local sensing) and 2-6 (remote sensing) show the connections for threeparallel-connected units; Figures 2-7 (local sensing) and 2-8 (remote sensing) show the connec-tions for three series-connected units. These figures allow other configurations, e.g., five paral-lel-connected units or two series connected units, etc. to be easily deduced. Figure 2-13 showsthe connections for a typical 3 X 2 (two parallel branches each consisting of three series-con-nected units) configuration, as well as simplified diagrams showing required arrangements for 2X 2. Consult factory for configurations requiring more than two units in parallel or series.CAUTION: For both parallel and series configurations, remove links between (COM S)and (COM OUT) terminals of all slaves to prevent damage to the unit andmaintain system accuracy. Make sure to accurately follow Figures 2-5through 2-8 for proper connection of the units.The following connections are required.• Power cables• Sense connections (either local or remote)• All interconnection cables and terminations required for parallel, series, 2 X 2 or 3 X 2configurations are supplied in the applicable Interconnection Kit (see Table 1-4 for partnumber).
