GE Pqm 2 Manual

CHAPTER 7: APPLICATIONS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL7–9
Select the communications port of your PC that is connected to the 
PQMII.
Click on OK. 
The following window will appear.
Change the settings in the Properties window to match those shown 
above.
Click on OK. 
You should now have a link to the PQMII. 
Enter the text LOAD in uppercase in the text window of Hyperterminal.
The PQMII Boot Menu should appear in the text window. 

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CHAPTER 7: APPLICATIONS
Type “E” to Erase the PQMII flash memory.
Hyperterminal will ask you to verify that you wish to erase the flash 
memory; enter “Y” for yes. The Boot Menu appears again when 
complete.
Now select “B” to blank check the flash memory. 
The PQMII Boot Menu will appear again when complete.
Type “U” to upload software to the PQMII. 
The PQMII is now waiting for a firmware file. 
Select Tr a n s f e r then Send File on the...

CHAPTER 7: APPLICATIONS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL7–11
7.3 Phasor Implementation
7.3.1 Theory of Phasor Implementation
The purpose of the function Calc_Phasors within the PQMII f irmware is to take a digitally 
sampled periodic signal and generate the equivalent phasor representation of the signal. 
In the conventional sense, a phasor depicts a purely sinusoidal signal which is what we’re 
interested in here; we wish to calculate the phasor for a given signal at the fundamental...

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CHAPTER 7: APPLICATIONS
(EQ 0.6)
The number of subtractions can be reduced between the calculations of real and 
imaginary components by not repeating the same subtraction twice. The following 
subtractions are repeated:
(EQ 0.7)
Substituting in the above ‘delta’ values results in the form of the equations that will be used 
to calculate the phasors:
(EQ 0.8)
Img ()1
8 ---
k1g3g5g11–g13–g19g21g27–g29– +++ ()
k
2g2g6g10–g14–g18g22g26–g30– +++ ()
k...

CHAPTER 7: APPLICATIONS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL7–13
7.4 Triggered Trace Memory
7.4.1 Description
The Triggered Trace Memory can be used to detect and record system disturbances. The 
PQMII uses a dedicated continuous sampling rate of 16 samples per cycle to record 
fluctuations in voltage or current as per user def ined levels. The PQMII calculates the true 
RMS value of one consecutive cycle, or 16 samples, and compares this value with the user-
def ined trigger levels to...

7–14PQMII POWER QUALITY METER  – INSTRUCTION MANUAL
CHAPTER 7: APPLICATIONS
7.5 Pulse Output
7.5.1 Pulse Output Considerations
Up to 4 SPDT Form C output relays are configurable as Pulse Initiators based on energy 
quantities calculated by the PQMII. Variables to consider when using the PQMII as a Pulse 
Initiator are:
•PQMII Pulse Output Parameter: The PQMII activates the assigned output relay based 
upon the energy quantity used as the base unit for pulse initiation. These energy 
quantities include...

CHAPTER 7: APPLICATIONS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL7–15
The PQMII Output Relays can be conf igured as Failsafe or Non-Failsafe to match the 
normally open/closed conf iguration of the KY and KZ connections at the end receiver. The 
K connection is always made to the COM connection of the designated PQMII output relay, 
and the Y and Z connections can be made to the N/O or N/C connections based upon the 
type of end receiver. 

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CHAPTER 7: APPLICATIONS
7.6 Data Logger Implementation
7.6.1 Data Logger Structure
The Data Logger allows various user def ined parameters to be continually recorded at a 
user-def ined rate. The Data Logger uses 64 samples/cycle data. The PQMII has allocated 
196608 bytes of memory for Data Log storage. The memory structure is partitioned into 
1536 blocks containing 64×2 byte registers as shown below:
FIGURE 7–2: Data Logger Memory Structure
Each...

CHAPTER 7: APPLICATIONS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL7–17
•Register number of Next Record to Write: A pointer to the register containing the 
last record in the Data Log.
•Log Pointer to First Item of Record After Last: A pointer to the next record to be 
written into the Data Log.
•Log Status: The current status of the Data Log; i.e.: Running or Stopped.
•Log Records Used: The number of records written into the Data Log.
•Log Time Remaining Until Next Reading: A counter showing how...

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CHAPTER 7: APPLICATIONS
Blocks 0 and 1 are reserved for Data Logger Data Interval information. Block 2 contains 
header information for both Data Logs. The f irst 32 registers of Block 2 are reserved for 
Data Log 1 header information, and the remaining 32 registers are reserved for Data Log 2 
header information. The f irst register of Data Log information resides at Register 0 of Block 
3. This leaves 196224 bytes of data storage.
FIGURE 7–3: Data Log...