GE PQM II, Instruction Manual

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7–24 PQMII 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 configured 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 : Defines 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 defined by this parameter.
• PQMII Switch Input A(D) Name : Defines 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 configured. It can be configured 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 configured 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.