Minimum And Maximum Values - Allen-Bradley Rockwell Automation 857 User Manual

5-4
Measurement Functions
Minimum and Maximum
Values
857-UM001A-EN-P – July 2009
Table 5.9 – Demand Value Parameters
Parameter Value
Time 10 ... 30
Fundamental frequency values
IL1da
IL2da
IL3da
Pda
PFda
Qda
Sda
RMS values
IL1da
IL2da
IL3da
Minimum and maximum values are registered with time stamps since
the latest manual clearing or since the device has been restarted. The
available registered min & max values are listed in the following
table.
Table 5.10 – Minimum and Maximum Values
Min & Max measurement
IL1, IL2, IL3
IL1RMS, IL2RMS, IL3RMS
Io1, Io2
U12, U23, U31
Uo
f
P, Q, S
IL1da, IL2da, IL3da
IL1da, IL2da, IL3da (rms value)
PFda
The clearing parameter "ClrMax" is common for all these values.
Table 5.11 – Parameters
Parameter Value
ClrMax
–
Clear
Unit Description
min Demand time (averaging time)
A Demand of phase current IL1
A Demand of phase current IL2
A Demand of phase current IL3
kW Demand of active power P
Demand of power factor PF
kvar Demand of reactive power Q
kVA Demand of apparent power S
A Demand of phase current IL1
A Demand of phase current IL2
A Demand of phase current IL3
Description
Phase current (fundamental frequency value)
Phase current, rms value
Residual current
Line-to-line voltage
Zero sequence voltage
Frequency
Active, reactive, apparent power
Demand values of phase currents
Demand values of phase currents, rms values
Power factor demand value
Description
Reset all minimum and maximum values
Set
Set
Set
S