1-16 BOP HIPWR 1113151.6.5 EXTERNAL REFERENCE (ANALOG CONTROL)An external reference, provided through the rear analog port connector (see Table 2-10), can beused to control the output of the BOP. The external reference may be applied directly or can beattenuated by the digital controls (see PAR. 3.4.3.2). The BOP will limit its output based on theuser configurable limits so that, in the event of a failure in the external reference, the devicesconnected to the output are protected. Refer to PAR. 3.4 for further details on using external sig-nals to control the output.1.6.6 EXTERNAL LIMITSWhen the unit is controlled by an external reference, the protection limits can also be controlledby analog signals that are digitally calibrated. The BOP samples the limit channel inputs andapplies the proper limit levels at a 5 mS rate with the positive and negative limits being sampledalternately. The external limit inputs are hardware-protected against overvoltage. Refer to PAR.3.4.41.6.7 USER-DEFINED VOLTAGE/CURRENT MAXIMUM VALUES (SOFTWARE LIMITS)The BOP output can be programmed not to exceed user-defined values. For example, the BOP36-28MG, which has a maximum capacity of ±36V, ±28A, can be limited to +30V, –10V, +5A, -1A for working with circuitry that might be damaged by higher levels. Once the limits are set, val-ues exceeding the limit values will not be accepted, including external references and protectionlimits. Refer to PAR. 3.3.4.1.1.6.8 PARALLEL AND SERIES CONFIGURATIONSIdentical BOP units may be configured in series, parallel or parallel-series (2 X 2 or 3 X 2) con-figurations. The 2 X 2 configurations doubles both output voltage and output current, the 3 X 2configuration triples the output voltage and doubles the output current. If a series/parallel config-uration is enabled, communication between the master BOP and those configured as slaveunits occurs via the BITBUS. Refer to PAR. 2.8 for further details.1.6.9 ENERGY RECUPERATIONThe BOP is a four-quadrant device as shown in Figure 1-3. Operating as a source, it deliversenergy into a passive load, and as a sink it operates as an electronic load, absorbing and dissi-pating energy from an active load. To minimize energy dissipation, the BOP employs energyrecuperation, where energy sinked from an active load is passed backwards through the outputcircuit and the bidirectional input power factor correcting circuit to the a-c power lines, where itbecomes available for reuse. This technology allows high power levels using switch-mode tech-nology while maintaining high efficiency and reduced size and weight.1.7 EQUIPMENT SUPPLIEDEquipment supplied with the BOP power supply is listed in Table 1-3.TABLE 1-3. EQUIPMENT SUPPLIEDITEM FUNCTION PART NUMBERSource Power Entry mating connector Mates with source power entry connector 142-0381 (Kepco) (IEC 320)PAR/SER CONTROL - INmating connectorMates with PAR/SER CONTROL - IN port to allowaccess to pins required for calibration142-0488 (Kepco)
