GE Power Quality Meter Series

GE Power Management PQM Power Quality Meter A-17
APPENDIX A A.1 PQM APPLICATION NOTES
A
3. Reading a negative 3 Phase Real Power actual value from the PQM:
4. Following the method described above:
DATA VALUE = (FF3A
×
2
16
) + EA7B hexadecimal
= (65338
×
2
16
) + 60027 converted to decimal
= 4282051195 decimal
5. The most significant bit of the High Order register is set, therefore the DATA VALUE is calculated as:
DATA VALUE = DATA VALUE – 2
32
= 4282051195 – 4294967296
= –12916101
Applying the Units & Scale parameters to the DATA VALUE, we multiply the DATA VALUE by 0.01 kW. There-
fore the resultant value of 3 Phase Real Power as read from the memory map is –129161.01 kW.
REGISTER ACTUAL VALUE (hex) DESCRIPTION UNITS & SCALE FORMAT
02F0 FF3A 3 Phase Real Power (high) 0.01 x kW F4
02F1 EA7B 3 Phase Real Power (low) 0.01 x kW F4