User Manual Chapter 3
GFK-2749A Jan 2020
Configuration and Data Transfer 53
GRID 2 Delta Mode: 0 = B phase is common, 1= C phase common
This bit must be set to 0 if the phase B is used as the common connection for the other
two voltages (North American standard). If the phase C is used as the common phase in
a Delta connection, this bit must be set to 1.
GRID 2 Energy reset: When set, the accumulated energy for Grid 2 is reset and held at 0
Wh or 0 VARh. When cleared, the Grid 2 energy value represents the accumulated
energy since power-up, or the last reset.
Relay close: Works with bit 16 to control the Sync Relay operation.
For more information, see “
Relay Open/Relay Close Operation
” on page 54.
Reconstructed Variables
If a PTn/CTn control bit is set, the corresponding voltage/current is measured and the PSM
system can use it. If cleared, the variable is not measured and the PSM module will try to
reconstruct the missing samples from the other measured variables. The following table
explains which variable in which measured system configuration can be reconstructed.
Dependence of reconstructed variable on measured variables
Missing Neutral in a 3-phase WYE connection if all phase currents are
measured
Missing Neutral in a 3-WIRE single phase system
Missing (common phase) voltage in a 3-phase DELTA system (default is Vac)
Missing (common phase) current in a 3-phase DELTA system (default is Ib)
In the three-phase Delta mode when only two voltages/currents are required to be
measured (non-measured variable can be reconstructed), the two available channels can
be used for an independent single voltage and/or current measurement
Note: If the PSM system will be used for generator synchronization with a Delta system it is
required that in both grids, the channels of non-measured voltage and current are left
unused so that these variables can be reconstructed.
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