Allen-Bradley 1404-M4, User Manual

Page: 59 / 356

Publication 1404-UM001D-EN-E - October 2004
Powermonitor 3000 Operations 3-33
Metering Update Rate
The metering update rate is a measure of how often the PM3000
calculates new metering results. The metering update rate is not
significant in most applications, but can be important in some control
applications. The metering update rate affects how quickly a setpoint
can respond to an electrical event and affects how often new metering
results are available for communications. The metering update rate is
dependent on the PM3000 model and device configuration.
Table 3.10 contains information that can be used to calculate the
metering update rate for a specific model containing specific
configuration selections.
Table 3.11 lists the minimum and maximum possible metering update
rate for each model based on information from Table 3.10.
Out-of-the-box metering update rates are based on factory-default
configuration data and are listed in Table 3.12 for all PM3000 model
and communication options. Factory default settings for configuration
parameters can be found in Appendix A.
Table 3.10 Metering update rate calculation based on model and device
configuration
Model and config options M4 M5 M6 M8 Update rate
Base metering update rate
• • • •
45mS
If device is an M4
•
Add 10mS
If RMS Resolution = High (see Table A.6)
• • • •
Add 10mS
If catalog # contains ENT, CNT, or DNT
• • • •
Add 5mS
If the Min/Max log is enabled (see Table A.23)
• • • •
Add 5mS
If more than 5 setpoints are configured
• • • •
Add 5mS
If Oscillography is enabled (see Table A.39)
• •
Add 5mS
If Transient detection is enabled (see Table A.43)
•
Add 15mS
If Meter Result Set is set to Tranducer mode or
Emergy Meter Mode (see Table A.47)
•
Subtract 5mS
Table 3.11 Min and max metering update rate for each model
Model Min and Max
metering update rate
M4 55-80mS
M5 45-70mS
M6 45-75mS
M8 40-90mS
Allen-Bradley HMIs