TDK-Lambda GENH6-100 User Manual

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TDK-Lambda GENH6-100 User Manual Manual pdf 50 page image

415.15 PARALLEL OPERATIONUp to four units of the same VOLTAGE and CURRENT rating can be connected in parallel to provideup to four times the output current capability. One of the units operates as a master and theremaining units are slaves. The slave units are analog programmed by the master unit.In remote digital operation, only the master unit can be programmed by the computer while the slaveunits may be connected to the computer for voltage, current and status readback only.There are two methods, basic and advanced, to configure multiple supplies for parallel operation.With both methods, Power Supplies, should be connected in a Daisy-Chain configuration.Refer to Sec. 5.15.1 , to Sec. 5.15.2 and to Sec.5.16 for detailed explanation.In this method, setting the units as Master and Slaves is made by the rear panel J1 connections andthe setup switch SW1. Each unit displays its own output current and voltage. To program the loadcurrent, the Master unit should be programmed to the total load current divided by the number ofunits in the system. Refer to the following procedure to configure multiple supplies for simple paralleloperation.5.15.1 Basic parallel operation5.15.2 Advanced parallel operation1. Basic configurationIn this method, multiple supplies can be configured to parallel operation as a single power supply.The total load current and output voltage are displayed by the Master unit and can be readbackfrom the Master unit. The Slave units display only their operating status (On, Off or Faultcondition).Refer to the following procedure to configure multiple supplies for Advanced parallel operation.Repeat steps 1 to 5 in Sec. 5.15.1 (Basic parallel operation).1. Setting up the Master unit2. Setting up the slave units3. Setting Over Voltage protection4. Setting Foldback protection5. Connection to the loadSet the master unit output voltage to the desired voltage. Program the current limit to thedesired load current limit divided by the number of parallel units. During operation, the masterunit operates in CV mode, regulating the load voltage at the programmed output voltage.Connect the sensing circuit to local or remote sensing as shown in Fig.5-4 or Fig.5-5.-1.The output voltage of the slave units should be programmed 2%~5% higher than the outputvoltage of the master unit to prevent interference with the master unit's control.The current limit of each unit should be programmed to the desired load current limitdivided by the number of parallel units.-2.Set the rear panel setup switch SW1 position 2 to it's up position.-3.Set the rear panel setup switch SW1 position 3 in the same position asSW1 position 4 of the master.-4.Connect short between J1-8 and J1-12 (refer to Table 4-4.)-5. Connect J1 terminal 10(IPGM) of the slave unit to J1 terminal 25(P) of the master unit.During operation the slave units operate as a controlled current source following the masteroutput current. It is recommended that the power system is designed so that each unit suppliesup to 95% of its current rating because of the imbalance which may be caused by cabling andconnections voltage drop.The master unit OVP should be programmed to the desired OVP level. The OVP of the slaveunits should be programmed to a higher value than the master OVP. When the master unitshuts down, it programs the slave unit to zero output voltage. If a slave unit shuts down(when its OVP is set lower than the master output voltage), only that unit would shut downand the remaining slave units would supply all the load current.Foldback protection if desired, may only be used with the master unit. When the master unitshuts down it programs the slave units to zero output voltage.In parallel operation, power supplies can be connected in local or remote sensing. Refer toFig.5-4 and 5-5 for typical connections of parallel power supplies. The figures showconnection of two units, however the same connection method applies up to 4 units.41