User Manual Chapter 3
GFK-2749A Jan 2020
Configuration and Data Transfer 41
Imbalance Threshold Examples
Example 1:
VI Imbalance is set to 20%, VA1 = 126V, VB1 = 90V, VC1 = 124V
The difference between VB1 and the average of the three voltages is greater than 20%, so
the VI Imbalance alarm will be set.
Example 2:
VI Imbalance is set to 25%, IA2 = 4.2A, IB2 = 3.6A, IC2 = 5.5A
The difference between IC2 and the average of the three currents is less than 25%, so the VI
Imbalance alarm will not be set.
3.1.4 Power Consumption
This tab displays the current that the module consumes for each voltage provided by the
power supply.
3.1.5 Terminals
If Variable Mode is selected in the module Properties, you can use this tab to map I/O
variables to the reference memory addresses used by the PSM module.
3.2 Data Transfer
3.2.1 PSM Status Flags
The PSM returns 80 status flag bits to the RX3i controller. Those 80 bits are grouped into five
16-bit words.
•
The first status word (%I1 – %I16) contains the overall PSM status flags.
•
The following two words (%I17 – %I48) contain the individual grid measurement faults.
These flags identify the voltage/current channel experiencing a measurement problem.
It can be one or multiple problems related to:
—
Input signal not present, that is, it is indicated as not measured in the
corresponding %Q flag bit AND it cannot be reconstructed by the PSM module
firmware.
—
Input signal is measured but it is clamped due to a higher peak voltage/current
value than the maximum value allowed to be applied to the interface unit
•
The last two status words (%I49 – %I80) contain the individual grid status flags, including
the ANSI alarms.
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