BOP HIPWR 031912 2-19FIGURE 2-8. TYPICAL MASTER/SLAVE PROTECTION INTERCONNECTIONSUpon startup, PAR/SER PROT IN PORT pin 8 of the master goes low, and stays low until allslaves are powered up. Normal power up of a unit causes the transistor connecting PAR/SERPROT IN PORT pin 2 and PAR/SER PROT OUT PORT pin 2 to conduct. The transistors of allunits are connected in series, effectively shorting out all the shutdown diodes (the shutdowndiodes of all units are also connected in series) connecting PAR/SER PROT IN PORT pin 1 andPAR/SER PROT OUT PORT pin 1. After all the units are powered up and operating normally,the low at PAR/SER PROT IN PORT pin 8 changes to high, but the conducting transistors keepthe voltage at pin 8 low and the diodes are cut off. If a fault occurs, the transistor between PAR/SER PROT IN PORT pin 2 and PAR/SER PROT OUT PORT pin 2 of the defective unit is cut off,allowing current to flow through the shutdown diodes. This develops internal shutdown signalsthat shut down all units.2.8.3 CONFIGURING PARALLEL, SERIES, 2 X 2 OR 3 X 2 COMBINATIONSNOTE: To power down the combination, first press the STANDBY key on the master to dis-able the output, then turn off the slave(s) followed by the master.1. To configure a unit to be designated as a slave proceed as follows:a. Turn on power only to the unit to be designated as a slave.b. From the power-up screen press % to enter the General Setup Menu. Highlight Series/Parallel and press ! to view the Multiple Units menu (see Table 2-12). If required, enterpassword (see PAR. 3.2.4.4) before continuing.
