GE Pqm 2 Manual

							CHAPTER 7: APPLICATIONS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL7–19
Total Space = (196224 / Record Size) – 1
As in the example, the total space calculated would be 196224 / 26 – 1 = 7546.07. This 
equates to 7546 records with 28 bytes of unused memory at the end of Block 1536. The 
total amount of space used in the structure can also be found in the Log Header in the Log 
Total Records f ield.
Address 1270h in the PQMII Memory Map is the Holding Register for the f irst available 
parameter for use by the Data Logs. The Data Logs will place the user-selected 
parameters into their respective Record structures based upon their respective order in the 
PQMII Memory Map.
For example, if Positive kWh, Frequency and Current Unbalance were selected as 
measured parameters, they would be placed into the Record structure in the following 
order: Unbalance (2 bytes, 16-bit value), Frequency (2 bytes, 16-bit value), and Positive kWh 
(4 bytes, 32-bit value). The Data Log Parameters table on the following page illustrates the 
order of parameters and their size.
Therefore, the Record size would be 8 bytes. To put a time value associated with each 
Record, you must read the Log T ime and Date from the Header. This is the time of the most 
recent Record in the Log. To time stamp the f irst Record used, multiply the Log T ime 
Interval by the Log Records Used and subtract this number from the time associated with 
the last Record. To determine the time associated with any Record, add the Log T ime 
Interval times the Record to be read to the time associated with the f irst Record in the Log.
For example:
Log T ime Interval:3600
Log T ime, Hours/Minutes:02 30
Log T ime, Seconds:30300
Log Date, Month:06 15
Log Date, Year:1997
Log Records Used:1600
The last Record entry time is interpreted as 2:30 AM, 30.300 seconds, June 15, 1997. The 
Log T ime Interval is 3600 seconds, or 1 hour. Taking the Log Records Used (1600) and 
multiplying this by the Log T ime Interval (3600) gives 5760000 seconds. This translates into 
66 days and 16 hours. Subtracting backwards on a calendar from the time for the last 
Record gives a time and date of 10:30:30.000 AM, April 9, 1997. This is the time stamp for 
the f irst Record. In the PQMII, the sampling time (log time interval) accuracy for the data 
logger is 0.15%. This could result in a different time stamp for the f irst record if the data 
logger is retrieved at a different time with a different number of records in the data logger. 
T ime stamping the remaining Records requires adding 3600 seconds for each Record 
starting from the time associated with the f irst Record. It is important to note that when in 
the Circulate mode, and the Data Log f ills the available memory, the Log wraps around the 
f irst available Register of the memory structure and the Log Pointer to First Item of First 
Record will float along in time with each additional entry into the Log. For example, if the 
Data Log has wrapped around the available memory more than once, the Log Pointer to 
First Item of First Record will always be preceded in memory by the Log Pointer to First 
Item of Record After Last . As each new entry is written into the Log, these two pointers 
move down to the next record space in memory, overwriting the f irst entry into the log as 
of the Present Log T ime and Date. 
						

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CHAPTER 7: APPLICATIONS
7.6.5 Data Log Parameters
Listed below are the parameters available for capturing data via the Data Logger. Note 
that these parameters will be placed within the Record structure of the Data Log in the 
order and size that they appear in this table.
where: I = current; V = Voltage; P = Real Power; Q = Reactive Power; S = Apparent Power; 
PF = Power Factor; THD = Total Harmonic DistortionTable 7–1: Data Log Parameters
DATA LOG 
PARAMETERSIZE 
(bytes)DATA LOG 
PARAMETERSIZE 
(bytes)DATA LOG 
PARAMETERSIZE 
(bytes)
Ia 2PFa 2kVAh 4
Ib 2 Pb 4 Ia Demand 2
Ic 2 Qb 4 Ib Demand 2
Iavg 2 Sb 4 Ic Demand 2
In 2PFb 2In Demand2
I Unbalance 2 Pc 4 P3 Demand 4
Van 4 Qc 4 Q3 Demand 4
Vbn 4 Sc 4 S3 Demand 4
Vcn 4 PFc 2 Ia THD 2
Vpavg 4 P3 4 Ib THD 2
Vab 4 Q3 4 Ic THD 2
Vbc 4 S3 4 In THD 2
Vca 4 PF3 2 Van THD 2
Vlavg 4 Frequency 2 Vbn THD 2
V Unbalance 2 Positive kWh 4 Vcn THD 2
Pa 4 Negative kWh 4 Vab THD 2
Qa 4 Positive kvarh 4 Vbc THD 2
Sa 4Negative 
kvarh4Analog Input4 
						

							CHAPTER 7: APPLICATIONS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL7–21
7.7 Reading Long Integers from the Memory Map
7.7.1 Description
The PQMII memory map contains data formatted as a long integer type, or 32 bits. 
Because the Modbus protocol maximum register size is 16 bits, the PQMII stores long 
integers in 2 consecutive register locations, 2 high order bytes, and 2 low order bytes. The 
data can be retrieved by the following logic:
7.7.2 Example
Reading a positive 3 Phase Real Power actual value from the PQMII:
Following the method described above, we have:
DATA VALUE = (004F × 2
16) + 35D1 hexadecimal
= 5177344 + 13777 converted to decimal
= 5191121 decimal
The most signif icant bit of the High Order register is not set , therefore the Data Value is as 
calculated. Applying the Units and Scale parameters to the Data Value, we multiply the 
Data Value by 0.01 kW. Therefore the resultant value of 3 Phase Real Power as read from 
the memory map is 51911.21 kW.
Reading a negative 3 Phase Real Power actual value from the PQMII:
READ THE HIGH ORDER REGISTER AND
STORE THIS VALUE INTO “A”
READ THE LOW ORDER REGISTER AND
STORE THIS VALUE INTO “B”
IS THE MOST SIGNIFICANT BIT OF THE HIGH
ORDER REGISTER SET?
i.e. is HIGH ORDER REGISTER >  32767?
YES
DATA VALUE = (A x 2 ) + B16
NO
(DATA VALUE = DATA VALUE – 232)
OR
APPLY 2’s COMPLEMENT TO DATA VALUE;
THE SIGN IS IMPLIED TO BE NEGATIVE
DATA VALUE = DATA VALUE
Register Actual Value Description Units & Scale Format
02F0 004Fh 3 Phase Real Power (high) 0.01 × kW F4
02F1 35D1h 3 Phase Real Power (low) 0.01 
× kW F4
Register Actual Value Description Units & Scale Format
02F0 FF3Ah 3 Phase Real Power (high) 0.01 × kW F4
02F1 EA7Bh 3 Phase Real Power (low) 0.01 
× kW F4 
						

							7–22PQMII POWER QUALITY METER  – INSTRUCTION MANUAL
CHAPTER 7: APPLICATIONS
Following the method described above:
DATA VALUE = (FF3A × 2
16) + EA7B hexadecimal
= (65338 × 216) + 60027 converted to decimal
= 4282051195 decimal
The most signif icant bit of the High Order register is set , therefore the Data Value is:
DATA VALUE = DATA VALUE – 2
32 = 4282051195 – 4294967296 = –12916101
Multiply the Data Value by 0.01 kW according to the Units and Scale parameter. The 
resultant 3 Phase Real Power value read from the memory map is –129161.01 kW. 
						

							CHAPTER 7: APPLICATIONS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL7–23
7.8 Pulse Input Application
7.8.1 Description
The PQMII has up to 4 Logical Switch Inputs that can be conf igured as Pulse Input 
Counters. Variables to consider when using the PQMII as a Pulse Input Counter are:
•PQMII Switch Input A(D) Function: Def ines the functionality to be provided by the 
PQMII Switch Input . For use as a Pulse Input Counter, the PQMII Switch Input to be 
used must be assigned as either Pulse Input 1, 2, 3, or 4.
•PQMII Switch Input A(D) Activation: Set to Open or Closed. The PQMII will see the 
operation of the Switch Input in the state as def ined by this parameter.
•PQMII Switch Input A(D) Name: Def ines the name given to each of the Switch 
Inputs used. It is used as a label only and has no bearing on the operation of the 
Switch Input .
•PQMII Pulse Input (Units): Represents the name given to the base units that the 
PQMII Pulse Input(s) will be counting. It is used as a label only and has no bearing 
on the operation of the Pulse Input .
•PQMII Pulse Input 1(4) Value: This value is assigned to each counting operation as 
determined by the Switch Input .
•PQMII Totalized Pulse Input: Creates a summing register of the various Pulse 
Inputs conf igured. It can be conf igured for any combination of the PQMII Switch 
Inputs used as Pulse Inputs.
7.8.2 PQMII Pulse Input(s) with a Pulse Initiator using KYZ Terminals
Typical end receivers require a contact closure between KY or KZ based upon the type of 
receiver. Because of the multi-functional parameters of the PQMII Switch Inputs, the PQMII 
Switch Inputs are not labeled with KYZ markings as a dedicated pulse input device. 
However, the PQMII can still be used as a pulse counter. The PQMII Switch Inputs require a 
signal from the PQMII Switch Common terminal to be activated. The PQMII conf igured as a 
Pulse Counter can be used with Two-Wire Pulse Initiators. The Pulse Initiator must provide 
a dry contact operation. The Switch Common terminal of the PQMII is connected to the K 
terminal of the Pulse Initiator. The PQMII Switch Input assigned to count pulses can be 
connected to the Y or the Z terminal of the Pulse Initiator, depending on the operation of 
the Pulse Initiator, i.e. Open or Closed. The PQMII Pulse Input (value) must be assigned to 
match the pulse value of the Pulse Initiator, i.e if the Pulse Initiator delivers a dry contact 
closure for every 100kWh, the PQMII Pulse Input (value) must also be set to 100.
Various operating parameters must be taken into account . The PQMII Switch Inputs 
require a minimum 100ms operation time to be detected. The duration of the contact 
operation can be indef inite. The internal Switch Input circuit of the PQMII is itself switched 
on and off at the times when the PQMII is reading the status of the Switch Inputs. 
Monitoring the input to one of the PQMII Switch Inputs will reveal a pulsed 24VDC 
waveform, not a constant signal. Standard wiring practice should be adhered to when 
making connections to the PQMII Switch Inputs, i.e. avoiding long runs of cable along 
current carrying conductors or any other source of EMI. An induced voltage on the Switch 
Input can cause malfunction of the Switch Input . 
						

							7–24PQMII POWER QUALITY METER  – INSTRUCTION MANUAL
CHAPTER 7: APPLICATIONS
7.9 Pulse Totalizer Application
7.9.1 Description
The PQMII has up to 4 Logical Switch Inputs that can be conf igured as Pulse Input 
Counters. One common application of these Pulse Inputs is their use as an energy totalizer 
for more than one circuit . One PQMII can totalize input from up to 4 different sources and 
sum these results into a single register. Variables to consider when using the PQMII as a 
Pulse Input Counter are:
•PQMII Switch Input A(D) Function: Def ines the functionality to be provided by the 
PQMII Switch Input . For use as a Pulse Input Counter, the PQMII Switch Input to be 
used must be assigned as either Pulse Input 1, 2, 3, or 4.
•PQMII Switch Input A(D) Activation: Set to Open or Closed. The PQMII will see the 
operation of the Switch Input in the state as def ined by this parameter.
•PQMII Switch Input A(D) Name: Def ines the name given to each of the Switch 
Inputs used. It is used as a label only and has no bearing on the operation of the 
Switch Input .
•PQMII Pulse Input (Units): Represents the name given to the base units that the 
PQMII Pulse Input(s) will be counting. It is used as a label only and has no bearing 
on the operation of the Pulse Input .
•PQMII Pulse Input 1(4) Value: This value is assigned to each counting operation as 
determined by the Switch Input .
•PQMII Totalized Pulse Input: This parameter creates a summing register of the 
various Pulse Inputs conf igured. It can be conf igured for any combination of the 
PQMII Switch Inputs used as Pulse Inputs.
7.9.2 Totalizing Energy from Multiple Metering Locations
The diagram below shows an example of a PQMII being used to totalize the energy from 4 
other PQMIIs. PQMIIs 1 through 4 have each of their respective Aux1 relays conf igured for 
Pulse Output functionality (refer to 7.5: Pulse Output for details). The Switch Common 
output from PQMII#4 is fed to the common contact of the Aux1 relays on PQMIIs 1 through 
4. The N/O contact of Aux1 for PQMIIs 1 through 4 will operate based upon the setup as 
described in the Pulse Output functionality section of the PQMII manual. The Totalized 
Pulse Input register of PQMII#4 can be set to sum the counts from Switch Inputs 1 through 
4, thus giving a total energy representation for the 4 metering locations. The count value 
for each Pulse Input on PQMII#4 can be set to match the Pulse Output Interval as 
programmed on each PQMII. For example, if PQMII#1 had a Pulse Output Interval = 
100 kWhr, and PQMII#2 had a Pulse Output Interval = 10 kWhr, then Pulse Input 1 on 
PQMII#4 would have the Pulse Input Value set for 100 and Pulse Input 2 on PQMII#4 would 
have the Pulse Input Value set for 10. 
						

							CHAPTER 7: APPLICATIONS
PQMII POWER QUALITY METER  – INSTRUCTION MANUAL7–25
FIGURE 7–4: Multiple Metering Locations
Various operating parameters must be taken into account . The PQMII Switch Inputs 
require a minimum 100 ms operation time to be detected. Therefore the Pulse Output 
Width should be equal to or greater than 100 ms. The duration of the contact operation 
can be indef inite. The internal Switch Input circuit of the PQMII is switched on and off at the 
times when the PQMII is reading the Switch Inputs status. Monitoring the input to one of 
the PQMII Switch Inputs will reveal a pulsed 24 V DC waveform, not a constant signal. 
Standard wiring practice should be adhered to when making connections to the PQMII 
Switch Inputs, i.e. avoiding long runs of cable along current carrying conductors or any 
other source of EMI. An induced voltage on the Switch Input can cause malfunction of the 
Switch Input .
ML L
PQM II
#1PQM II
#2PQM II
#3 F1 F2F3
M
F4
AUX1 AUX1 AUX1
COMCOMCOM41 41 41424242N/ON/ON/O
AUX1COM41 42
N/O
PQM II
#4
+24VDC SW1 SW2 SW3 SW4
33 3231 3029 
						

							7–26PQMII POWER QUALITY METER  – INSTRUCTION MANUAL
CHAPTER 7: APPLICATIONS 
						

							PQMII POWER QUALITY METER  – INSTRUCTION MANUAL8–1
PQMII Power Quality Meter
Chapter 8: Warranty
Digital Energy
War ranty
8.1 GE Multilin Device Warranty
8.1.1 Warranty Statement
General Electric Multilin (GE Multilin) warrants each device it manufactures to be free from 
defects in material and workmanship under normal use and service for a period of 24 
months from date of shipment from factory.
In the event of a failure covered by warranty, GE Multilin will undertake to repair or replace 
the device providing the warrantor determined that it is defective and it is returned with all 
transportation charges prepaid to an authorized service centre or the factory. Repairs or 
replacement under warranty will be made without charge.
Warranty shall not apply to any device which has been subject to misuse, negligence, 
accident , incorrect installation or use not in accordance with instructions nor any unit that 
has been altered outside a GE Multilin authorized factory outlet .
GE Multilin is not liable for special, indirect or consequential damages or for loss of prof it or 
for expenses sustained as a result of a device malfunction, incorrect application or 
adjustment .
For complete text of Warranty (including limitations and disclaimers), refer to GE Multilin 
Standard Conditions of Sale. 
						

							8–2PQMII POWER QUALITY METER  – INSTRUCTION MANUAL
CHAPTER 8: WARRANTY