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4 Using the Regenerative Power System
Primary/Secondary Command Details
Once connected, the group of units are controlled through the primary and appear as a single higher
power unit. All programming commands should be sent to the primary unit. The following SCPI
commands are not supported in primary/secondary mode:
CALibrate
ELOG:CURRent<:MAX|:MIN>
OUTPut:COUPle<:STATe|:OFFSet>
The following SCPI commands can be sent to the secondary unit in primary/secondary mode. Other
commands may be allowed, but could disrupt control of the secondary unit by the primary unit.
INSTrument:GROup:FUNCtion
INSTrument:SECondary:ADDRess
LXI:IDENtify:STATe
LXI:MDNS:STATe
SYSTem:REBoot*
*The Reboot command can also be sent to the primary unit, but will not propagate to the secondary units.
Troubleshooting
In primary/secondary mode, the following status indicators and messages may appear on the front
panel:
PSP - primary/secondary protection
There has been a communication loss between the primary and secondary units. Check that the
CAT6A cables
are installed in the primary/secondary connectors, not in the in the LAN or Safety
Disconnect.
CSF - Current sharing fault
There has been a current sharing fault due to the primary/secondary loop being out of regulation. This
can occur if the
termination switches
turned off. It can also occur temporarily if there has been a mode crossover from a load transient or
due to rapid up/down programming. If this is the case, set the current limit to a higher value. CSF can
also occur if the loop can no longer regulate the current imbalance between units. CSF can also be an
initial indication of communication loss with the primary unit; which will transition to PSP.
No secondary units discovered or 1 secondary discovered (if expecting multiple secondary units)
Check that there are no duplicate secondary addresses.
Error 332, Primary/Secondary Error
This most often indicates that the primary unit has lost communication with a secondary, and is usually
accompanied by PSP. Check that the primary/secondary
110
all CALibrate commands except CAL:STAT
all ELOG:CURR :MAX and :MIN commands
all :STAT and :OFFS commands
Enables the Primary/Secondary function
Sets the secondary bus address
Turn on front panel LXI Identify indicator
Sets the LXI MDNS state
Reboot command
are set incorrectly or if one of the units in the parallel stack is
CAT6A cables
Keysight RP7970 & RP7980 Series Operating and Service Guide
are installed correctly. This
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