Keysight Technologies RP7900 Series, Operating And Service Manual

Page: 113 / 318

This is the 10 kW master unit.
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The "M" indicates master unit.
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The current displayed (100 A) is the total output
current of all paralleled units. The unit is only con-
tributing 40 A to the total.
This is the 10 kW slave unit.
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The "S" indicates slave unit.
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The current displayed (40 A) is the current that
this unit is contributing to the total.
This is the 5 kW slave unit.
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The "S" indicates slave unit.
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The current displayed (20 A) is the current that
this unit is contributing to the total. This is half of
the current of the 10 kW units.
In current priority mode, set the output current of the master unit to the desired value.
Set the voltage limit to a higher value than the expected operating voltage of the unit.
Master/Slave Communication
While connected, the master unit periodically polls the slave units for status. If communication with a
slave fails, the master goes into master/slave protection (MSP). The master sends a command to the
slaves that do respond to also go into MSP. A current-sharing fault (CSF) will likely occur If the
termination switches are not set incorrectly.
Slave units use the periodic master status poll as a timer to trip MSP. If the slave does not receive a
status poll every 10 seconds or less, it goes into MSP.
Slaves units may go into MSP 10 seconds after power-on. Once the slave units are discovered, the
master unit will establish communication with the slave units, thereby clearing the MSP.
Master/Slave Protection
If the master unit goes into protection, it sends a protection command to the slave units. The master
unit indicates the type of protection event that has occurred. The slave units indicate PROT. Once the
protection condition is corrected, clearing protection on the master unit will clear protection on all
units (see
Clearing Protection ).
If any slave unit goes into protection, the master unit and the slave unit on which the protection event
occurred indicate the type of protection event. All other slaves indicate PROT. Once the protection
condition is corrected, clearing protection on the master unit will clear protection on all units.
When using the Fault or Inhibit functions on the rear panel digital connector, connect the Fault/Inhibit
pins only on the master unit. You do not need to connect the Fault/Inhibit pins of the slave units.
Keysight RP7900 Series Operating and Service Guide 113
4 Using the Regenerative Power System