Marathon Electric DVR 2000E+ - Page 56

56
Marathon Electric (a division of RBC Manufacturing Corp.) reserves the right to change specications and this manual without notice.
Revised 06/2011
GENERATOR AVERAGE VOLTAGE AND CURRENT (REGULATOR SENSING) – This message contains average
generator line voltage and phase current sensed at the regulator after possible step-down from potential and cur-
rent transformers.
Message ID (0xFF39) – Generator Average Voltage and Current (Regulator Output)
Source: DVR
®
2000E+
Message Group: Metering
PDU Format: 255 (PDU2)
PDU Specific: 57
BYTE 0 BYTE 1 BYTE 2 BYTE 3 BYTE 4 BYTE 5 BYTE 6 BYTE 7
Avg RMS
Current
(LSB)
Avg RMS
Current
(MSB)
Avg RMS
Voltage
(LSB)
Avg RMS
Voltage
(MSB)
CT Ratio
Scalar
(LSB)
CT Ratio
Scalar
(MSB)
CT Ratio
Exp
Unused
0x?? 0x?? 0x?? 0x?? 0x?? 0x?? 0x?? 0xFF
Byte 0 Average RMS Current (LSB) – this is the Least Significant Byte of the average
three-phase root-mean-square current. (1 bit = 0.001 Arms)
Byte 1 Average RMS Current (MSB) – this is the Most Significant Byte of the average three-
phase root-mean-square current. (1 bit = 0.001 Arms)
Byte 2 Average Line-to-Line RMS Voltage (LSB) – this is the Least Significant Byte of the
average of all three line-to-line voltages. (1 bit = 0.1 Vrms)
Byte 3 Average Line-to-Line RMS Voltage (MSB) – this is the Most Significant Byte of the
average of all three line-to-line voltages. (1 bit = 0.1 Vrms)
Byte 4-6 CT Ratio – these three bytes comprise the current transformer ratio as a fixed-point
number. The CT ratio is calculated as: Scalar*2^(-Exp) where Scalar is a 16-bit
word with LSB and MSB given by bytes 4 and 5 and the exponent is given by byte
6. See Message 0xFF19 For a similar representation of the PT Ratio
Byte 7 Unused