Publicité
Les langues disponibles
Les langues disponibles
4 Using the Regenerative Power System
Primary/Secondary Front Panel Display
The current value read from the front panel of the primary unit is the aggregate of the values of the
primary and the secondary units. The secondary units return their individual current values.
The following example illustrates the front panel displays during primary/secondary operation. Three
units are connected in a primary/secondary configuration. The units are operating in voltage priority
mode.
This is the 10 kW primary unit.
The "P" indicates the primary unit.
l
The current displayed (100 A) is the total output
l
current of all paralleled units. The unit is only
contributing 40 A to the total.
This is the 10 kW secondary unit.
The "S" indicates a secondaryunit.
l
The current displayed (40 A) is the current that
l
this unit is contributing to the total.
This is the 5 kW secondary unit.
The "S" indicates a secondary unit.
l
The current displayed (20 A) is the current that
l
this unit is contributing to the total. This is half of
the current of the 10 kW units.
Primary/Secondary Communication
While connected, the primary unit periodically polls the secondary units for status. If communication
with any secondary fails, for example if a secondary unit is turned on or off, the primary and remaining
secondary units go into primary/secondary protection (PSP). When the remaining secondary units
detect that the primary has disconnected, they also go into PSP. Additionally, a current-sharing fault
(CSF) will likely occur if the
Secondary units use the periodic primary status poll as a timer to trip PSP. If the secondary does not
receive a status poll every 10 seconds or less, it goes into PSP.
Secondary units may go into PSP 10 seconds after power-on. Once these units are discovered, the
primary unit will establish communication with the secondary units, thereby clearing the PSP.
Primary/Secondary Protection
If the primary unit goes into protection, it sends a protection command to the secondary units. The
primary unit indicates the type of protection event that has occurred. The secondary units indicate
PROT. Once the protection condition is corrected, clearing protection on the primary clears protection
on all units (see
Clearing
122
termination switches
Protection).
are not set correctly.
Keysight RP7900 Series Operating and Service Guide
Publicité
