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ML0047 December 1, 2017 Copyright 2017 Bitronics, LLC
In addition, the Phase Angle is calculated for the Bus 1 to Bus 2 per-phase
Fundamental Voltages and Fundamental Voltage to Fundamental Current. It is the
Bus 1 Fundamental Voltage angle minus either the Bus 1 Fundamental Current or Bus
2 Fundamental Voltage angle for a given phase. Values are from -180 to +180
Degrees. Note that all the phase angles are only available in the TUC register set and
use calculation type T8 (see Modbus and DNP3 Protocol manuals for more detail).
5.11.8 Slip Frequency (1-Cycle Update)
The Slip Frequency is the difference in the Frequency of a phase of Bus 1 Voltage to
Bus 2 Voltage. Values are + when Bus 1 Frequency is greater.
5.12 Heartbeat and Health Check
PPX II meters provide a Heartbeat State Counter Register that allows the user to
determine the time between successive polls. This counter will increment by the
number of milliseconds that have elapsed since the last time the data was updated.
Another use of this register is as a visual indicator that the data is changing; it allows
users of certain MMIs to identify disruption in the polling of the instrument. The
Heartbeat State Counter is a full 32-bit counter that rolls over at 4,294,967,295
(4,294,967 seconds). The counter starts at zero on power-up, and is NOT stored in
non-volatile memory.
PPX II have several self-tests built in to ensure that the instrument is performing
accurately. The results of these self-tests are available in the Health Check register
which is a simple 16-bit binary value. Each bit represents the results of a particular
self-test, with "0" indicating the test was passed, and "1" indicating the test was failed.
If Health status failures occur, the meter may have experienced an operational failure.
The table below provides a reference of error codes. The Health Check value shown
in the PPX II web live data page is a hexadecimal representation of the binary value.
For example, a Health Check value of 0000 0014 is the equivalent of the binary value
000000000010100. The “1” shown in bit 2 and bit 4 represents a failed test in those
bits which indicates a checksum error for both the gain and phase on the calibration.
Contact the factory for further instructions.
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