Keysight RP7970 Serie Manuel D'utilisation page 109

No Power Limitation when paralleling 1 kV, 20 kW units with 1 kV, 30 kW units
There is no power limitation when paralleling 1 kV units with unequal power ratings.
Power Limitations when paralleling 30 kW units using 200/208 Vac input mains
The output power of all 30 kW units when operating at 200/208 Vac nominal will be limited to 15 kW.
The output current of these units will also be limited to one half of their rated current. Because the 30
kW units can operate at either 200/208 or 380/480 Vac, the following limitations also apply:
All secondary units must be using the same ac mains line voltage as the primary unit. You cannot
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have some primary or secondary units using a 200/208 Vac input and others using a 380/480 Vac
input, or an error (332) will occur.
When an operating state is saved when the unit is operating on a specific ac line voltage, and the
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ac line voltage is subsequently changed, that saved state will not be able to be recalled (*RCL), An
error (341) will occur. This also occurs with units in a primary secondary configuration if any of their
output states were previously saved when operating at a different ac line voltage.
Keysight RP7970 & RP7980 Series Operating and Service Guide
4 Using the Regenerative Power System
109